Byline Bancorp (BY) 10-Q 10 Aug 20 2020 Q2 Quarterly report Financial data

Document And Entity Information

Document And Entity Information - shares	6 Months Ended
	Jun. 30, 2020	Aug. 07, 2020
Cover [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2020
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q2
Trading Symbol	BY
Entity Registrant Name	Byline Bancorp, Inc.
Entity Central Index Key	0001702750
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
Entity Interactive Data Current	Yes
Document Quarterly Report	true
Document Transition Report	false
Entity Current Reporting Status	Yes
Entity Shell Company	false
Entity File Number	001-38139
Entity Tax Identification Number	36-3012593
Entity Incorporation, State or Country Code	DE
Entity Address, Address Line One	180 North LaSalle Street
Entity Address, Address Line Two	Suite 300
Entity Address, City or Town	Chicago
Entity Address, State or Province	IL
Entity Address, Postal Zip Code	60601
City Area Code	773
Local Phone Number	244-7000
Entity Common Stock, Shares Outstanding		38,411,842
Title of each class	Common Stock
Name of each exchange on which registered	NYSE

CONSOLIDATED STATEMENTS OF FINA

CONSOLIDATED STATEMENTS OF FINANCIAL CONDITION (UNAUDITED) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
ASSETS
Cash and due from banks	$ 51,818	$ 48,228
Interest bearing deposits with other banks	88,113	32,509
Cash and cash equivalents	139,931	80,737
Equity and other securities, at fair value	8,181	8,031
Securities available-for-sale, at fair value	1,426,871	1,186,292
Securities held-to-maturity, at amortized cost (fair value at June 30, 2020—$4,582, December 31, 2019—$4,498)	4,404	4,412
Restricted stock, at cost	6,232	22,127
Loans held for sale	3,031	11,732
Loans and leases:
Loans and leases	4,391,122	3,785,661
Allowance for loan and lease losses	(51,300)	(31,936)
Net loans and leases	4,339,822	3,753,725
Servicing assets, at fair value	18,351	19,471
Premises and equipment, net	95,546	96,140
Other real estate owned, net	8,652	9,896
Goodwill and other intangible assets, net	176,470	180,255
Bank-owned life insurance	9,896	9,750
Deferred tax assets, net	37,082	38,315
Accrued interest receivable and other assets	119,049	100,926
Total assets	6,393,518	5,521,809
LIABILITIES
Non-interest-bearing demand deposits	1,768,675	1,279,641
Interest-bearing deposits	3,189,670	2,867,936
Total deposits	4,958,345	4,147,577
Other borrowings	510,414	539,638
Subordinated notes, net	48,777
Junior subordinated debentures issued to capital trusts, net	36,206	37,334
Accrued interest payable and other liabilities	58,841	47,145
Total liabilities	5,612,583	4,771,694
STOCKHOLDERS’ EQUITY
Preferred stock	10,438	10,438
Common stock	381	379
Additional paid-in capital	583,307	580,965
Retained earnings	168,444	159,033
Accumulated other comprehensive income (loss), net of tax	20,033	(700)
Treasury stock, at cost	(1,668)
Total stockholders’ equity	780,935	750,115
Total liabilities and stockholders’ equity	$ 6,393,518	$ 5,521,809
Preferred shares par value	$ 0.01	$ 0.01
Preferred shares authorized	50,000	50,000
Preferred shares issued	10,438	10,438
Preferred shares outstanding	10,438	10,438
Common shares par value	$ 0.01	$ 0.01
Common shares authorized	150,000,000	150,000,000
Common shares issued	38,506,703	38,256,500
Common shares outstanding	38,388,217	38,256,500
Treasury common shares	118,486

CONSOLIDATED STATEMENTS OF FI_2

CONSOLIDATED STATEMENTS OF FINANCIAL CONDITION (UNAUDITED) (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Statement Of Financial Position [Abstract]
Securities held-to-maturity, fair value	$ 4,582	$ 4,498

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
INTEREST AND DIVIDEND INCOME
Interest and fees on loans and leases	$ 50,153	$ 59,524	$ 104,311	$ 113,907
Interest on securities	7,530	6,665	15,546	12,767
Other interest and dividend income	222	571	1,214	1,196
Total interest and dividend income	57,905	66,760	121,071	127,870
INTEREST EXPENSE
Deposits	4,246	9,306	12,050	17,382
Other borrowings	476	2,265	2,373	4,431
Subordinated notes and debentures	574	741	1,214	1,524
Total interest expense	5,296	12,312	15,637	23,337
Net interest income	52,609	54,448	105,434	104,533
PROVISION FOR LOAN AND LEASE LOSSES	15,518	6,391	29,973	10,390
Net interest income after provision for loan and lease losses	37,091	48,057	75,461	94,143
NON-INTEREST INCOME
Total non-interest income	12,788	14,183	21,961	26,171
ATM and interchange fees	845	945	2,061	1,662
Net gains on sales of securities available-for-sale		973	1,375	973
Change in fair value of equity securities, net	766	551	147	1,050
Net gains on sales of loans	6,456	7,472	11,229	13,705
Wealth management and trust income	608	626	1,277	1,221
Other non-interest income	389	768	781	1,664
NON-INTEREST EXPENSE
Salaries and employee benefits	19,405	23,652	44,071	46,544
Occupancy and equipment expense, net	5,359	5,069	10,883	10,018
Loan and lease related expenses	1,260	1,841	2,571	3,418
Legal, audit and other professional fees	2,078	2,981	4,412	5,047
Data processing	2,826	3,849	5,491	6,993
Net loss recognized on other real estate owned and other related expenses	456	252	975	448
Other intangible assets amortization expense	1,892	1,959	3,785	3,732
Other non-interest expense	3,736	4,351	8,351	8,433
Total non-interest expense	37,012	43,954	80,539	84,633
INCOME BEFORE PROVISION FOR INCOME TAXES	12,867	18,286	16,883	35,681
PROVISION FOR INCOME TAXES	3,728	5,075	4,778	9,873
NET INCOME	9,139	13,211	12,105	25,808
Dividends on preferred shares	195	195	391	391
INCOME AVAILABLE TO COMMON STOCKHOLDERS	$ 8,944	$ 13,016	$ 11,714	$ 25,417
EARNINGS PER COMMON SHARE
Basic	$ 0.24	$ 0.35	$ 0.31	$ 0.69
Diluted	$ 0.24	$ 0.34	$ 0.31	$ 0.68
Fees and Service Charges on Deposits [Member]
NON-INTEREST INCOME
Total non-interest income	$ 1,455	$ 1,441	$ 3,128	$ 3,211
Loan Servicing Revenue [Member]
NON-INTEREST INCOME
Total non-interest income	2,980	2,630	5,738	5,169
Loan Servicing Asset Revaluation [Member]
NON-INTEREST INCOME
Total non-interest income	$ (711)	$ (1,223)	$ (3,775)	$ (2,484)

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Statement Of Other Comprehensive Income [Abstract]
Net income	$ 9,139	$ 13,211	$ 12,105	$ 25,808
Securities available-for-sale
Unrealized holding gains arising during the period	13,402	12,328	30,067	20,962
Reclassification adjustments for net gains included in net income		(973)	(1,375)	(973)
Tax effect	(3,732)	(3,405)	(7,990)	(5,700)
Net of tax	9,670	7,950	20,702	14,289
Cash flow hedges
Unrealized holding losses arising during the period		(3,417)		(5,234)
Reclassification adjustments for net losses (gains) included in net income	21	(575)	42	(1,280)
Tax effect	(6)	1,113	(11)	1,815
Net of tax	15	(2,879)	31	(4,699)
Total other comprehensive income	9,685	5,071	20,733	9,590
Comprehensive income	$ 18,824	$ 18,282	$ 32,838	$ 35,398

CONSOLIDATED STATEMENTS OF CHAN

CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS EQUITY - USD ($)	Total	Preferred Stock	Common Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Treasury Stock
Beginning balance at Dec. 31, 2018	$ 650,672,000	$ 10,438,000	$ 361,000	$ 546,849,000	$ 102,522,000	$ (9,498,000)
Beginning balance, shares at Dec. 31, 2018		10,438	36,343,239
Net income	12,597,000				12,597,000
Other comprehensive income (loss), net of tax	4,519,000					4,519,000
Issuance of common stock upon exercise of stock options	636,000		$ 1,000	635,000
Issuance of common stock upon exercise of stock options, shares			50,662
Restricted stock activity, shares			(8,500)
Issuance of common stock in connection with employee stock purchase plan	291,000			291,000
Issuance of common stock in connection with employee stock purchase plan, shares			12,743
Cumulative-effect adjustment (ASU 2016-01)					1,440,000	(1,440,000)
Cash dividends declared on preferred stock	(196,000)				(196,000)
Share-based compensation expense	230,000			230,000
Ending balance at Mar. 31, 2019	668,749,000	$ 10,438,000	$ 362,000	548,005,000	116,363,000	(6,419,000)
Ending balance, shares at Mar. 31, 2019		10,438	36,398,144
Beginning balance at Dec. 31, 2018	650,672,000	$ 10,438,000	$ 361,000	546,849,000	102,522,000	(9,498,000)
Beginning balance, shares at Dec. 31, 2018		10,438	36,343,239
Net income	25,808,000
Other comprehensive income (loss), net of tax	9,590,000
Cumulative-effect adjustment (ASU 2016-01)	(1,440,000)
Ending balance at Jun. 30, 2019	717,675,000	$ 10,438,000	$ 378,000	578,828,000	129,379,000	(1,348,000)
Ending balance, shares at Jun. 30, 2019		10,438	38,115,219
Beginning balance at Dec. 31, 2018	650,672,000	$ 10,438,000	$ 361,000	546,849,000	102,522,000	(9,498,000)
Beginning balance, shares at Dec. 31, 2018		10,438	36,343,239
Ending balance at Dec. 31, 2019	750,115,000	$ 10,438,000	$ 379,000	580,965,000	159,033,000	(700,000)
Ending balance, shares at Dec. 31, 2019		10,438	38,256,500
Beginning balance at Mar. 31, 2019	668,749,000	$ 10,438,000	$ 362,000	548,005,000	116,363,000	(6,419,000)
Beginning balance, shares at Mar. 31, 2019		10,438	36,398,144
Net income	13,211,000				13,211,000
Other comprehensive income (loss), net of tax	5,071,000					5,071,000
Issuance of common stock upon exercise of stock options	1,669,000		$ 1,000	1,668,000
Issuance of common stock upon exercise of stock options, shares			116,048
Issuance of common stock due to business combination,net of issuance costs	28,892,000		$ 15,000	28,877,000
Issuance of common stock due to business combination, net of issuance costs, shares			1,464,558
Restricted stock activity, shares			136,469
Cash dividends declared on preferred stock	(195,000)				(195,000)
Cash dividends declared on common stock ($0.03 per share)	0
Share-based compensation expense	278,000			278,000
Ending balance at Jun. 30, 2019	717,675,000	$ 10,438,000	$ 378,000	578,828,000	129,379,000	(1,348,000)
Ending balance, shares at Jun. 30, 2019		10,438	38,115,219
Net income	15,342,000				15,342,000
Other comprehensive income (loss), net of tax	2,309,000					2,309,000
Issuance of common stock upon exercise of stock options	54,000			54,000
Issuance of common stock upon exercise of stock options, shares			3,472
Issuance cost in connection with business combination	(157,000)			(157,000)
Restricted stock activity, shares			36,350
Issuance of common stock in connection with employee stock purchase plan	289,000			289,000
Issuance of common stock in connection with employee stock purchase plan, shares			14,085
Cash dividends declared on preferred stock	(196,000)				(196,000)
Share-based compensation expense	550,000			550,000
Ending balance at Sep. 30, 2019	735,866,000	$ 10,438,000	$ 378,000	579,564,000	144,525,000	961,000
Ending balance, shares at Sep. 30, 2019		10,438	38,169,126
Net income	15,852,000				15,852,000
Other comprehensive income (loss), net of tax	(1,661,000)					(1,661,000)
Issuance of common stock upon exercise of stock options	787,000			787,000
Issuance of common stock upon exercise of stock options, shares			71,029
Restricted stock activity			$ 1,000	(1,000)
Restricted stock activity, shares			16,345
Cash dividends declared on preferred stock	(196,000)				(196,000)
Cash dividends declared on common stock ($0.03 per share)	(1,148,000)				(1,148,000)
Share-based compensation expense	615,000			615,000
Ending balance at Dec. 31, 2019	750,115,000	$ 10,438,000	$ 379,000	580,965,000	159,033,000	(700,000)
Ending balance, shares at Dec. 31, 2019		10,438	38,256,500
Net income	2,966,000				2,966,000
Other comprehensive income (loss), net of tax	11,048,000					11,048,000
Issuance of common stock upon exercise of stock options	677,000		$ 1,000	676,000
Issuance of common stock upon exercise of stock options, shares			55,402
Restricted stock activity, shares			174,036
Issuance of common stock in connection with employee stock purchase plan	268,000			268,000
Issuance of common stock in connection with employee stock purchase plan, shares			15,569
Cash dividends declared on preferred stock	(196,000)				(196,000)
Cash dividends declared on common stock ($0.03 per share)	(1,151,000)				(1,151,000)
Repurchase of common stock	(1,668,000)						$ (1,668,000)
Repurchase of common stock, shares			(118,486)
Share-based compensation expense	608,000			608,000
Ending balance at Mar. 31, 2020	762,667,000	$ 10,438,000	$ 380,000	582,517,000	160,652,000	10,348,000	(1,668,000)
Ending balance, shares at Mar. 31, 2020		10,438	38,383,021
Beginning balance at Dec. 31, 2019	750,115,000	$ 10,438,000	$ 379,000	580,965,000	159,033,000	(700,000)
Beginning balance, shares at Dec. 31, 2019		10,438	38,256,500
Net income	12,105,000
Other comprehensive income (loss), net of tax	20,733,000
Ending balance at Jun. 30, 2020	780,935,000	$ 10,438,000	$ 381,000	583,307,000	168,444,000	20,033,000	(1,668,000)
Ending balance, shares at Jun. 30, 2020		10,438	38,388,217
Beginning balance at Mar. 31, 2020	762,667,000	$ 10,438,000	$ 380,000	582,517,000	160,652,000	10,348,000	(1,668,000)
Beginning balance, shares at Mar. 31, 2020		10,438	38,383,021
Net income	9,139,000				9,139,000
Other comprehensive income (loss), net of tax	9,685,000					9,685,000
Issuance of common stock upon exercise of stock options	56,000			56,000
Issuance of common stock upon exercise of stock options, shares			5,196
Restricted stock activity			$ 1,000	(1,000)
Cash dividends declared on preferred stock	(195,000)				(195,000)
Cash dividends declared on common stock ($0.03 per share)	(1,152,000)				(1,152,000)
Share-based compensation expense	735,000			735,000
Ending balance at Jun. 30, 2020	$ 780,935,000	$ 10,438,000	$ 381,000	$ 583,307,000	$ 168,444,000	$ 20,033,000	$ (1,668,000)
Ending balance, shares at Jun. 30, 2020		10,438	38,388,217

CONSOLIDATED STATEMENTS OF CH_2

CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS EQUITY (Parenthetical) - $ / shares	3 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019
Statement Of Stockholders Equity [Abstract]
Dividends per share	$ 0.03	$ 0.03	$ 0.03

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended						6 Months Ended		12 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 9,139	$ 2,966	$ 15,852	$ 15,342	$ 13,211	$ 12,597	$ 12,105	$ 25,808
Adjustments to reconcile net income to net cash from operating activities:
PROVISION FOR LOAN AND LEASE LOSSES	15,518				6,391		29,973	10,390
Impairment loss on assets held for sale							715	392
Depreciation and amortization of premises and equipment							3,207	3,260
Change in fair value of equity securities, net							(147)	(1,050)
Net amortization of securities							2,772	1,191
Net gains on sales of securities available-for-sale					(973)		(1,375)	(973)
Net loss on disposal of premises and equipment							172
Net gains on sales of assets held for sale								(13)
Net gains on sales of loans	(6,456)				(7,472)		(11,229)	(13,705)
Originations of U.S. government guaranteed loans							(133,322)	(140,780)
Proceeds from U.S. government guaranteed loans sold							127,571	133,061
Accretion of premiums and discounts on acquired loans, net							(6,843)	(10,069)
Net change in servicing assets							1,120	(67)
Net valuation adjustments on other real estate owned	302				79		765	163
Net (gains) losses on sales of other real estate owned	(3)				(6)		(85)	27
Other intangible assets amortization expense	1,892				1,959		3,785	3,732
Amortization of time deposit premium							(37)	(111)
Amortization of subordinated notes issuance cost							2
Accretion of junior subordinated debentures discount							260	291
Share-based compensation expense							1,343	508
Deferred tax provision, net of valuation							1,233	908
Increase in cash surrender value of bank owned life insurance							(146)	(188)
Loss on redemption of junior subordinated debentures							112
Changes in assets and liabilities:
Accrued interest receivable							(1,895)	(2,942)
Other assets							5,233	(12,109)
Accrued interest payable							(1,707)	957
Accrued expenses and other liabilities							9,715	(9,731)
Net cash provided by (used in) operating activities							43,297	(11,050)
CASH FLOWS FROM INVESTING ACTIVITIES
Purchases of securities available-for-sale							(469,896)	(149,176)
Proceeds from maturities and calls of securities available-for-sale							111,981	34,174
Proceeds from paydowns of securities available-for-sale							99,367	41,976
Proceeds from sales of securities available-for-sale							45,417	59,594
Purchases of Federal Home Loan Bank stock							(49,165)	(19,935)
Federal Home Loan Bank stock repurchases							65,060	16,614
Net change in loans and leases							(609,709)	(94,259)
Purchases of premises and equipment							(3,401)	(1,413)
Proceeds from sales of assets held for sale								514
Proceeds from sales of other real estate owned							650	874
Net cash received in acquisition of business								4,306
Proceeds from bank owned life insurance death benefit							69
Net cash used in investing activities							(809,627)	(106,731)
CASH FLOWS FROM FINANCING ACTIVITIES
Net increase in deposits							810,805	20,267
Proceeds from short-term borrowings							4,901,800	3,509,180
Repayments of short-term borrowings							(5,387,800)	(3,445,135)
Proceeds from Paycheck Protection Program Liquidity Facility advances							449,889
Proceeds from subordinated notes, net							48,775
Repayments of junior subordinated debentures							(1,500)
Net increase in securities sold under agreements to repurchase							6,887	(1,281)
Dividends paid on preferred stock							(391)	(391)
Dividends paid on common stock							(2,274)
Proceeds from issuance of common stock upon exercise of stock options							733	2,305
Proceeds from issuance of common stock							268	291
Repurchases of common stock							(1,668)
Net cash provided by financing activities							825,524	85,236
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS							59,194	(32,545)
CASH AND CASH EQUIVALENTS, beginning of period		$ 80,737		$ 89,315		$ 121,860	80,737	121,860	$ 121,860
CASH AND CASH EQUIVALENTS, end of period	$ 139,931		$ 80,737		$ 89,315		139,931	89,315	$ 80,737
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:
Cash paid during the period for interest							17,119	22,200
Cash paid during the period for taxes							3,309	9,507
SUPPLEMENTAL DISCLOSURES OF NON-CASH INVESTING AND FINANCING ACTIVITIES:
Transfer of securities from held-to-maturity to available-for-sale								94,837
Reclassification of equity and other securities								6,609
Delayed payments of mortgage-backed securities							300	841
Due from counterparties							49,409	34,226
Total assets acquired from acquisition								323,914
Value ascribed to goodwill								17,461
Total liabilities assumed from acquisition								305,892
Common stock issued due to acquisition of business								$ 29,320
Common dividend declared, not paid							$ 1,177

Basis of Presentation

Basis of Presentation	6 Months Ended
	Jun. 30, 2020
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Basis of Presentation	Note 1—Basis of Presentation These unaudited interim condensed consolidated financial statements include the accounts of Byline Illinois state chartered These unaudited interim condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) for interim financial information and in accordance with the instructions to Form 10-Q and Article 10 of Regulation S-X as promulgated by the Securities and Exchange Commission (“SEC”). In preparing these financial statements, the Company has evaluated events and transactions subsequent to June 30, 2020 for potential recognition or disclosure. In the opinion of management, all adjustments (consisting of normal recurring accruals) considered necessary for a fair presentation of the financial position and results of operations for the periods presented have been included. Certain information in footnote disclosures normally included in financial statements prepared in accordance with GAAP has been condensed or omitted pursuant to the rules and regulations of the SEC and the accounting standards for interim financial statements. These financial statements should be read in conjunction with the consolidated financial statements and notes thereto included in the Company’s Consolidated Financial Statements for the years ended December 31, 2019, 2018, and 2017. In accordance with the Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) Topic 855, “Subsequent Events,” the Company’s management has evaluated subsequent events for potential recognition or disclosure through the date of the issuance of these consolidated financial statements. The Company has one reportable segment. The Company’s chief operating decision maker evaluates the operations of the Company using consolidated information for purposes of allocating resources and assessing performance. Therefore, segments disclosures are not required. No subsequent events were identified that would have required a change to the consolidated financial statements or disclosure in the notes to the consolidated financial statements. Certain prior period amounts have been reclassified to conform to current period presentation. These reclassifications did not result in any changes to previously reported net income or stockholders’ equity.

Accounting Pronouncements Recen

Accounting Pronouncements Recently Adopted or Issued	6 Months Ended
	Jun. 30, 2020
Accounting Changes And Error Corrections [Abstract]
Accounting Pronouncements Recently Adopted or Issued	Note 2—Accounting Pronouncements Recently Adopted or Issued The following reflect recent accounting pronouncements that have been adopted or are pending adoption by the Company. As the Company qualifies as an emerging growth company and has elected the extended transition period for complying with new or revised accounting pronouncements, it is not subject to new or revised accounting standards applicable to public companies during the extended transition period. The accounting pronouncements pending adoption below reflect effective dates for the Company as an emerging growth company with the extended transition period. Adopted Accounting Pronouncement Nonrefundable Fees and Other Costs (Subtopic 310‑20) —In March 2017, FASB issued ASU No. 2017‑08, . The amendments in the ASU shorten the amortization period for certain callable debt securities held at a premium at the earliest call date. Under current GAAP, the Company amortizes the premium as an adjustment of yield over the contractual life of the instrument. As a result, upon exercise of a call on a callable debt security held at a premium, the unamortized premium is charged to earnings. The ASU shortens the amortization period for certain callable debt securities held at a premium and requires the premium to be amortized to the earliest call date. However, the amendments do not require an accounting change for securities held at a discount; the discount continues to be amortized to maturity. The amendments are effective for fiscal years beginning after December 15, 2019, and interim periods within fiscal years beginning after December 15, 2020. The Company is required to apply the amendments on a modified retrospective basis through a cumulative-effect adjustment directly to retained earnings as of the beginning of the period of adoption. Given our emerging growth status, t he Company adopted these amendments on January 1, 2020 in conjunction with ASU No. 2017-08, which did not have a material impact on the Company’s Consolidated Financial Statements. Issued Accounting Pronouncements Pending Adoption Leases (Topic 842) —In February 2016, FASB issued ASU No. 2016‑02, . The amendments in this ASU require lessees to recognize the following for all leases (with the exception of short-term) at the commencement date: a lease liability, which is a lessee’s obligation to make lease payments arising from a lease, measured on a discounted basis; and a right-of-use asset, which is an asset that represents the lessee’s right to use, or control the use of, a specified asset for the lease term. The amendments in this ASU leave lessor accounting largely unchanged, although certain targeted improvements were made to align lessor accounting with the lessee accounting model. This ASU simplifies the accounting for sale and leaseback transactions primarily because lessees must recognize lease assets and lease liabilities. The amendments in this ASU are effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. Early application is permitted upon issuance. Lessees (for capital and operating leases) and lessors (for sales-type, direct financing, and operating leases) must apply a modified retrospective transition approach for leases existing at, or entered into after, the beginning of the earliest comparative period presented in the financial statements. The modified retrospective approach would not require any transition accounting for leases that expired before the earliest comparative period presented. Lessees and lessors may not apply a full retrospective transition approach. The Company is evaluating the new guidance and its impact on the Company’s Consolidated Statements of Operations and Consolidated Statements of Financial Condition. In November 2019, FASB issued ASU No. 2019-10, , which delays the effective date of this ASU for entities not classified as Public Business Entities (PBEs). Our status as an emerging growth company makes us eligible for this deferral. Assuming the Company remains an emerging growth company, the new authoritative guidance is effective for fiscal years beginning after December 15, 2020, and interim periods with fiscal years beginning after December 15, 2021. The Company expects an increase in assets and liabilities as a result of recognizing additional right-of-use assets and liabilities under lease contracts in which the Company is lessee. While the Company has not quantified the impact of this ASU on its direct financing lease portfolio, it does not expect a material change in its accounting for the initial direct costs related to these leases. Financial Instruments—Credit Losses (Topic 326) —In June 2016, FASB issued ASU No. 2016‑13, . Current GAAP requires an “incurred loss” methodology for recognizing credit losses that delays recognition until it is probable a loss has been incurred. The main objective of this ASU is to provide financial statement users with more decision-useful information about the expected credit losses on financial instruments and other commitments to extend credit held by a reporting entity at each reporting date. The amendments in this ASU replace the incurred loss impairment methodology in current GAAP with a methodology that reflects expected credit losses and requires consideration of a broader range of reasonable and supportable information to inform credit loss estimates. The amendments in this ASU require a financial asset (or group of financial assets) measured at amortized cost basis to be presented at the net amount expected to be collected. The allowance for credit losses is a valuation account that is deducted from the amortized cost basis of the financial asset(s) to present the net carrying value at the amount expected to be collected on the financial asset. The measurement of expected credit losses will be based on relevant information about past events, including historical experience, current conditions, and reasonable and supportable forecasts that affect the collectability of the reported amount. The amendments in this ASU broaden the information that an entity must consider in developing its expected credit loss estimate for assets measured either collectively or individually. The use of forecasted information incorporates more timely information in the estimate of expected credit loss, which will be more useful to users of the financial statements. In November 2019, FASB issued ASU No. 2019-10, , which delays the effective date of the ASU for entities not classified as PBEs. Assuming the Company remains an emerging growth company, the new authoritative guidance is effective for fiscal years beginning after December 15, 2022, including interim periods within those fiscal years. The Company is in the process of implementation and determining the impact that this ASU will have on the Company’s Consolidated Financial Statements. Income Taxes (Topic 740) —In December 2019, FASB issued ASU No. 2019-12, Simplifying the Accounting for Income Taxes . The amendments in the ASU simplify the accounting for income taxes by removing the following: the exception to the incremental approach for intraperiod tax allocation when there is a loss from continuing operations and income or a gain from other items; the exception to the requirement to or not to recognize a deferred tax liability for a foreign entity when it becomes an equity method investment or it becomes a subsidiary, respectively; and the exception to the general methodology for calculating income taxes in an interim period when a year-to-date loss exceeds the anticipated loss for the year. The amendments in the ASU changes current authoritative guidance by requiring the recognition of franchise tax that is partially based on income as an income-based tax and account for any incremental amount incurred as a non-income-based tax; requiring an evaluation when a step up in the tax basis of goodwill should be considered part the of business combination; specifying that it is not required to allocate the consolidated amount of current and deferred tax expense to a legal entity that is not subject to tax in its separate financial statements; and requiring that an entity reflect the effect of an enacted change in tax laws or rates in the annual effective tax rate computation in the interim period that includes the enactment date. The amendments are effective for annual periods beginning after December 15, 2021, and interim periods within annual periods beginning after December 15, 2022. Early adoption is permitted. Assuming the Company remains an emerging growth company, the new authoritative guidance will be effective for reporting periods after January 1, 2022. The Company is currently evaluating the provisions of ASU No. 2019-12 to determine the potential impact the new standard will have on the Company’s Consolidated Financial Statements. Reference Rate Reform (Topic 848) —In March 2020, FASB issued ASU No. 2020-04, . The amendments in the ASU provide optional guidance for a limited period of time to ease the potential burden in accounting for (or recognizing the effects of) reference rate reform on financial reporting. The amendments in the ASU provide optional expedients and exceptions for applying generally accepted accounting principles to contract modifications and hedging relationships, subject to meeting certain criteria, that reference LIBOR or another reference rate expected to be discontinued. The ASU is intended to help stakeholders during the global market-wide reference rate transition period. The amendments in the ASU will be in effect for all entities as of March 12, 2020 through December 31, 2022. The Company is currently evaluating the provisions of ASU No. 2020-04 to determine the potential impact the new standard will have on the Company’s Consolidated Financial Statements.

Acquisition

Acquisition	6 Months Ended
	Jun. 30, 2020
Business Combinations [Abstract]
Acquisition	Note 3—Acquisition On April 30, 2019, the Company acquired all of the outstanding common stock of Oak Park River Forest Bankshares, Inc. (“Oak Park River Forest”) and its subsidiary pursuant to an Agreement and Plan of Merger, dated as of October 17, 2018 (the “OPRF Merger Agreement”). Oak Park River Forest operated one wholly owned subsidiary, Community Bank of Oak Park River Forest. Oak Park River Forest was merged with and into Byline. As a result of the merger, Oak Park River Forest’s subsidiary bank, Community Bank of Oak Park River Forest, was merged with and into Byline Bank, with Byline Bank as the surviving bank. The acquisition improves the Company’s footprint in the Chicagoland market, diversifies its commercial banking business, and strengthens the core deposit base. At the effective time of the merger (the “OPRF Effective Time”), each share of Oak Park River Forest’s common stock was converted into the right to receive: (1) 7.9321 shares of Byline’s common stock, and (2) an amount in cash equal to $6.2 million divided by the number of outstanding shares of Oak Park River Forest common stock as of the closing date, with cash paid in lieu of any fractional shares. The per share cash consideration was based on the total $6.2 million divided by the outstanding shares of Oak Park River Forest common stock, or $33.375 per outstanding share. Based on the closing price of the Company’s common stock of $20.02, as reported by the New York Stock Exchange, and 1,464,558 shares of common stock issued with respect to the outstanding shares of Oak Park River Forest common stock, the stock consideration was valued at $29.3 million. Options to acquire 35,870 shares of Oak Park River Forest common stock that were outstanding at the OPRF Effective Time were cancelled, at the option holders election, in exchange for a cash payment in accordance with the OPRF Merger agreement of $4.2 million, to be paid after the closing date. The value of the total merger consideration at closing was $35.5 million before issuance costs of $585,000. The transaction resulted in goodwill of $20.2 million, which is nondeductible for tax purposes, as this acquisition was a nontaxable transaction. Goodwill represents the premium paid over the fair value of the net tangible and intangible assets acquired and reflects related synergies expected from the combined operations. The Company incurred Oak Park River Forest merger-related expenses, including acquisition advisory expenses, of $2.3 million for the year ended December 31, 2019, including $2.4 million and $2.5 million recognized in the three and six months ended June 30, 2019, respectively. Core system conversion expenses were $2.0 million related to the Oak Park River Forest acquisition for the year ended December 31, 2019. Core system conversion expenses of $703,000 were recognized during the three and six months ended June 30, 2019. These expenses are reflected in non-interest expense on the Consolidated Statements of Operations. The acquisition of Oak Park River Forest was accounted for using the acquisition method of accounting in accordance with ASC Topic 805. Assets acquired, liabilities assumed and consideration exchanged were recorded at their respective acquisition date fair values. Determining the fair value of assets and liabilities involves significant judgment regarding methods and assumptions used to calculate estimated fair values. The fair value adjustments associated with this transaction were finalized during the first quarter of 2020. The following table presents a summary of the fair values of assets acquired and liabilities assumed as of the acquisition date: Assets Cash and cash equivalents $ 10,469 Securities available-for-sale 30,343 Restricted stock 414 Loans 257,423 Premises and equipment 3,488 Other real estate owned 2,201 Other intangible assets 6,220 Bank-owned life insurance 3,485 Deferred tax assets, net 5,925 Other assets 1,231 Total assets acquired 321,199 Liabilities Deposits 290,171 Line of credit 5,655 Federal Home Loan Bank advances 5,300 Accrued expenses and other liabilities 4,766 Total liabilities assumed 305,892 Net assets acquired $ 15,307 Consideration paid Common stock (1,464,558 shares issued at $20.02 per share) 29,320 Cash paid 6,163 Total consideration paid 35,483 Goodwill $ 20,176 The following table presents the acquired non-impaired loans as of the acquisition date: Fair value $ 204,496 Gross contractual amounts receivable 254,755 Estimate of contractual cash flows not expected to be collected (1) 12,987 Estimate of contractual cash flows expected to be collected 241,768 (1) Includes interest payments not expected to be collected due to loan prepayments as well as principal and interest payments not expected to be collected due to customer default. The discount on the acquired non-impaired loans is being accreted into income over the life of the loans on an effective yield basis. The following table provides the unaudited pro forma information for the results of operations for the three and six months ended June 30, 2019, as if the acquisitions had occurred on January 1, 2019. The pro forma results combine the historical results of Oak Park River Forest into the Company’s Consolidated Statements of Operations, including the impact of certain acquisition accounting adjustments, which includes loan discount accretion, intangible assets amortization, deposit premium accretion, and borrowings, net of discount amortization. The pro forma results have been prepared for comparative purposes only and are not necessarily indicative of the results that would have been obtained had the acquisition actually occurred on January 1, 2019. No assumptions have been applied to the pro forma results of operations regarding possible revenue enhancements, provision for credit losses, expense efficiencies or asset dispositions. The acquisition-related expenses that have been recognized are included in net income in the following table for the three and six months ended June 30, 2019. For the Three Months Ended For the Six Months Ended June 30, June 30, 2019 2019 Total revenues (net interest income and non-interest income) $ 68,003 $ 136,262 Net income $ 13,982 $ 27,572 Earnings per share—basic $ 0.35 $ 0.71 Earnings per share—diluted $ 0.34 $ 0.70 Revenues and earnings of the acquired company since the acquisition date has not been disclosed as it is not practicable as Oak Park River Forest was merged into the Company and separate financial information is not readily available.

Securities

Securities	6 Months Ended
	Jun. 30, 2020
Investments Debt And Equity Securities [Abstract]
Securities	Note 4—Securities The following June 30, 2020 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value Available-for-sale U.S. Treasury Notes $ 30,443 $ 652 $ — $ 31,095 U.S. Government agencies 137,002 865 (72 ) 137,795 Obligations of states, municipalities, and political subdivisions 120,427 4,735 (6 ) 125,156 Residential mortgage-backed securities Agency 662,424 17,566 (125 ) 679,865 Non-agency 75,844 1,447 — 77,291 Commercial mortgage-backed securities Agency 232,137 7,028 (111 ) 239,054 Non-agency 30,984 237 — 31,221 Corporate securities 55,599 1,020 (341 ) 56,278 Asset-backed securities 50,431 — (1,315 ) 49,116 Total $ 1,395,291 $ 33,550 $ (1,970 ) $ 1,426,871 June 30, 2020 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value Held-to-maturity Obligations of states, municipalities, and political subdivisions $ 4,404 $ 178 $ — $ 4,582 Total $ 4,404 $ 178 $ — $ 4,582 December 31, 2019 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value Available-for-sale U.S. Treasury Notes $ 41,403 $ 427 $ — $ 41,830 U.S. Government agencies 165,162 542 (754 ) 164,950 Obligations of states, municipalities, and political subdivisions 92,806 2,075 (49 ) 94,832 Residential mortgage-backed securities Agency 490,427 2,163 (2,354 ) 490,236 Non-agency 109,501 593 (272 ) 109,822 Commercial mortgage-backed securities Agency 159,650 1,092 (1,041 ) 159,701 Non-agency 31,144 130 — 31,274 Corporate securities 48,796 571 (37 ) 49,330 Asset-backed securities 44,515 — (198 ) 44,317 Total $ 1,183,404 $ 7,593 $ (4,705 ) $ 1,186,292 December 31, 2019 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value Held-to-maturity Obligations of states, municipalities, and political subdivisions $ 4,412 $ 86 $ — $ 4,498 Total $ 4,412 $ 86 $ — $ 4,498 The Company did not classify securities as trading during the six months ended June 30, 2020 or during 2019. Gross unrealized losses and fair values, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position as of June 30, 2020 and December 31, 2019, are summarized as follows: Less than 12 Months 12 Months or Longer Total June 30, 2020 # of Securities Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses Available-for-sale U.S. Government agencies 3 $ 27,051 $ (72 ) $ — $ — $ 27,051 $ (72 ) Obligations of states, municipalities and political subdivisions 3 415 (6 ) — — 415 (6 ) Residential mortgage-backed securities Agency 7 62,821 (119 ) 542 (6 ) 63,363 (125 ) Non-agency — — — — — — — Commercial mortgage-backed securities Agency 1 10,139 (111 ) — — 10,139 (111 ) Non-agency — — — — — — — Corporate securities 12 23,629 (341 ) — — 23,629 (341 ) Asset-backed securities 9 43,115 (1,315 ) — — 43,115 (1,315 ) Total 35 $ 167,170 $ (1,964 ) $ 542 $ (6 ) $ 167,712 $ (1,970 ) Less than 12 Months 12 Months or Longer Total December 31, 2019 # of Securities Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses Available-for-sale U.S. Government agencies 8 $ 49,318 $ (662 ) $ 20,283 $ (92 ) $ 69,601 $ (754 ) Obligations of states, municipalities and political subdivisions 7 13,309 (45 ) 1,419 (4 ) 14,728 (49 ) Residential mortgage-backed securities Agency 50 132,703 (666 ) 193,363 (1,688 ) 326,066 (2,354 ) Non-agency 9 36,902 (206 ) 10,126 (66 ) 47,028 (272 ) Commercial mortgage-backed securities Agency 13 67,649 (563 ) 32,678 (478 ) 100,327 (1,041 ) Corporate securities 4 6,103 (37 ) — — 6,103 (37 ) Asset-backed securities 8 37,738 (198 ) — — 37,738 (198 ) Total 99 $ 343,722 $ (2,377 ) $ 257,869 $ (2,328 ) $ 601,591 $ (4,705 ) Certain T o available-for-sale The proceeds from all sales of securities three and six months ended June 30, 2020 For the Three Months Ended For the Six Months Ended June 30, June 30, 2020 2019 2020 2019 Proceeds $ — $ 59,594 $ 45,417 $ 59,594 Gross gains — 1,049 1,457 1,049 Gross losses — 76 82 76 There were no gains or losses and $1.4 million in net gains reclassified from income income Securities posted as collateral were $1.0 billion and $552.4 million at June 30, 2020 and December 31, 2019, respectively, of which carrying amounts of $330.9 million and $301.1 million were pledged at June 30, 2020 and December 31, 2019, At June 30, 2020, the Amortized Cost Fair Value Available-for-sale Due in one year or less $ 30,114 $ 30,390 Due from one to five years 49,382 50,805 Due from five to ten years 175,499 178,405 Due after ten years 138,907 139,840 Mortgage-backed securities 1,001,389 1,027,431 Total $ 1,395,291 $ 1,426,871 Held-to-maturity Due in one year or less $ 504 $ 508 Due from one to five years 3,900 4,074 Total $ 4,404 $ 4,582

Loan and Lease Receivables

Loan and Lease Receivables	6 Months Ended
	Jun. 30, 2020
Receivables [Abstract]
Loan and Lease Receivables	Note 5—Loan Outstanding loan and lease receivables as of the dates shown were categorized as follows: June 30, December 31, 2020 2019 Commercial real estate $ 1,349,297 $ 1,275,058 Residential real estate 670,257 711,499 Construction, land development, and other land 246,669 279,403 Commercial and industrial 1,309,523 1,330,418 Paycheck Protection Program ("PPP") 626,593 — Installment and other 3,684 6,484 Lease financing receivables 174,307 177,774 Total loans and leases 4,380,330 3,780,636 Net unamortized deferred fees and costs 8,271 2,289 Initial direct costs 2,521 2,736 Allowance for loan and lease losses (51,300 ) (31,936 ) Net loans and leases $ 4,339,822 $ 3,753,725 June 30, December 31, 2020 2019 Lease financing receivables Net minimum lease payments $ 188,826 $ 193,359 Unguaranteed residual values 1,575 1,347 Unearned income (16,094 ) (16,932 ) Total lease financing receivables 174,307 177,774 Initial direct costs 2,521 2,736 Lease financial receivables before allowance for lease losses $ 176,828 $ 180,510 Total loans and leases consist of originated loans and leases, acquired impaired loans and acquired non-impaired loans and leases. At June 30, 2020 and December 31, 2019, total loans and leases included the guaranteed amount of U.S. government guaranteed loans of $747.2 million and $119.8 million, respectively. At June 30, 2020 and December 31, 2019, the discount on the unguaranteed portion of U.S. government guaranteed loans was $24.5 million and $23.1 million, respectively, which are included in total loans and leases. At June 30, 2020 and December 31, 2019, installment and other loans included overdraft deposits of $304,000 and $852,000, respectively, which were reclassified as loans. At June 30, 2020 and December 31, 2019, loans and leases and loans held for sale pledged as security for borrowings were $2.6 billion and $1.8 billion, respectively. The minimum Minimum Lease Payments 2020 $ 36,115 2021 64,203 2022 46,052 2023 27,303 2024 12,721 Thereafter 2,432 Total $ 188,826 Originated Topic more than insignificant having evidence of credit quality deterioration do not qualify to be accounted for as acquired impaired loans and Topic June 30, 2020 Originated Acquired Impaired Acquired Non- Impaired Total Commercial real estate $ 919,510 $ 126,405 $ 305,041 $ 1,350,956 Residential real estate 480,692 90,784 99,288 670,764 Construction, land development, and other land 219,261 4,784 21,958 246,003 Commercial and industrial 1,200,996 13,485 116,668 1,331,149 Paycheck Protection Program 611,664 — — 611,664 Installment and other 2,714 226 818 3,758 Lease financing receivables 160,741 — 16,087 176,828 Total loans and leases $ 3,595,578 $ 235,684 $ 559,860 $ 4,391,122 December 31, 2019 Originated Acquired Impaired Acquired Non- Impaired Total Commercial real estate $ 792,263 $ 135,914 $ 348,365 $ 1,276,542 Residential real estate 483,072 100,223 128,527 711,822 Construction, land development, and other land 235,794 5,373 37,490 278,657 Commercial and industrial 1,160,996 16,909 153,660 1,331,565 Installment and other 5,372 249 944 6,565 Lease financing receivables 158,155 — 22,355 180,510 Total loans and leases $ 2,835,652 $ 258,668 $ 691,341 $ 3,785,661 Acquired impaired loans —As part of the Oak Park River Forest acquisition, the Bank acquired impaired loans in the amount of $52.9 million. Refer to Note 3—Acquisition for additional information regarding the transaction. The following table presents a reconciliation of the undiscounted contractual cash flows, non-accretable difference, accretable yield, and fair value of acquired impaired loans as of the acquisition date of April 30, 2019: Undiscounted contractual cash flows $ 74,092 Undiscounted cash flows not expected to be collected (non-accretable difference) (11,401 ) Undiscounted cash flows expected to be collected 62,691 Accretable yield at acquisition (9,764 ) Estimated fair value of impaired loans acquired at acquisition $ 52,927 The outstanding June 30, 2020 December 31, 2019 Outstanding Balance Carrying Value Outstanding Balance Carrying Value Commercial real estate $ 134,224 $ 126,405 $ 189,969 $ 135,914 Residential real estate 95,706 90,784 151,641 100,223 Construction, land development, and other land 7,530 4,784 14,841 5,373 Commercial and industrial 17,716 13,485 23,330 16,909 Installment and other 284 226 1,099 249 Total acquired impaired loans $ 255,460 $ 235,684 $ 380,880 $ 258,668 The following table summarizes the changes in accretable yield for acquired impaired loans for the three and six months ended June 30, 2020 and 2019: Three Months Ended Six Months Ended June 30, June 30, 2020 2019 2020 2019 Beginning balance $ 37,037 $ 29,340 $ 40,009 $ 37,115 Additions — 8,501 — 8,501 Accretion to interest income (4,452 ) (5,996 ) (9,657 ) (11,245 ) Reclassification from (to) nonaccretable difference, net (717 ) 14,693 1,516 12,167 Ending balance $ 31,868 $ 46,538 $ 31,868 $ 46,538 Acquired non-impaired loans and leases —The Company acquired non-impaired loans as part of the Oak Park River Forest acquisition in the amount of $204.5 million. Refer to Note 3—Acquisition for additional information regarding the transaction. The unpaid June 30, 2020 December 31, 2019 Unpaid Principal Balance Carrying Value Unpaid Principal Balance Carrying Value Commercial real estate $ 312,284 $ 305,041 $ 356,787 $ 348,365 Residential real estate 100,571 99,288 130,412 128,527 Construction, land development, and other land 22,411 21,958 38,416 37,490 Commercial and industrial 120,626 116,668 159,599 153,660 Installment and other 840 818 971 944 Lease financing receivables 17,687 16,087 23,976 22,355 Total acquired non-impaired loans and leases $ 574,419 $ 559,860 $ 710,161 $ 691,341

Allowance for Loan and Lease Lo

Allowance for Loan and Lease Losses and Reserve for Unfunded Commitments	6 Months Ended
	Jun. 30, 2020
Receivables [Abstract]
Allowance for Loan and Leases and Reserve for Unfunded Commitments	Note 6—Allowance for Loans and leases The following June 30, 2020 Commercial Real Estate Residential Real Estate Construction, Land Development, and Other Land Commercial and Industrial Paycheck Protection Program Installment and Other Lease Financing Receivables Total Allowance for loan and lease losses Three months ended Beginning balance $ 11,851 $ 2,778 $ 1,004 $ 24,139 $ — $ 53 $ 2,015 $ 41,840 Provisions 3,306 956 487 10,695 — (17 ) 91 15,518 Charge-offs (1,088 ) (4 ) — (4,845 ) — — (561 ) (6,498 ) Recoveries 41 11 — 119 — — 269 440 Ending balance $ 14,110 $ 3,741 $ 1,491 $ 30,108 $ — $ 36 $ 1,814 $ 51,300 Six months ended Beginning balance $ 7,965 $ 1,990 $ 610 $ 19,377 $ — $ 50 $ 1,944 $ 31,936 Provisions 7,728 1,740 881 19,241 — (14 ) 397 29,973 Charge-offs (1,640 ) (9 ) — (8,803 ) — — (1,018 ) (11,470 ) Recoveries 57 20 — 293 — — 491 861 Ending balance $ 14,110 $ 3,741 $ 1,491 $ 30,108 $ — $ 36 $ 1,814 $ 51,300 Ending balance: Individually evaluated for impairment $ 3,525 $ 80 $ — $ 10,409 $ — $ — $ — $ 14,014 Collectively evaluated for impairment 8,576 2,898 1,404 17,822 — 36 1,814 32,550 Loans acquired with deteriorated credit quality 2,009 763 87 1,877 — — — 4,736 Total allowance for loan and lease losses $ 14,110 $ 3,741 $ 1,491 $ 30,108 $ — $ 36 $ 1,814 $ 51,300 June 30, 2020 Commercial Real Estate Residential Real Estate Construction, Land Development, and Other Land Commercial and Industrial Paycheck Protection Program Installment and Other Lease Financing Receivables Total Loans and leases ending balance: Individually evaluated for impairment $ 36,751 $ 1,805 $ 4,189 $ 35,545 $ — $ — $ — $ 78,290 Collectively evaluated for impairment 1,187,800 578,175 237,030 1,282,119 611,664 3,532 176,828 4,077,148 Loans acquired with deteriorated credit quality 126,405 90,784 4,784 13,485 — 226 — 235,684 Total loans and leases $ 1,350,956 $ 670,764 $ 246,003 $ 1,331,149 $ 611,664 $ 3,758 $ 176,828 $ 4,391,122 June 30, 2019 Commercial Real Estate Residential Real Estate Construction, Land Development, and Other Land Commercial and Industrial Installment and Other Lease Financing Receivables Total Allowance for loan and lease losses Three months ended Beginning balance $ 6,660 $ 1,970 $ 536 $ 15,630 $ 63 $ 2,247 $ 27,106 Provisions 2,695 (62 ) 155 3,320 8 275 6,391 Charge-offs (818 ) (9 ) — (1,827 ) (4 ) (622 ) (3,280 ) Recoveries 397 272 — 3 — 243 915 Ending balance $ 8,934 $ 2,171 $ 691 $ 17,126 $ 67 $ 2,143 $ 31,132 Six months ended Beginning balance $ 7,540 $ 1,751 $ 466 $ 12,932 $ 49 $ 2,463 $ 25,201 Provisions 3,137 156 225 6,352 22 498 10,390 Charge-offs (2,169 ) (9 ) — (2,179 ) (4 ) (1,267 ) (5,628 ) Recoveries 426 273 — 21 — 449 1,169 Ending balance $ 8,934 $ 2,171 $ 691 $ 17,126 $ 67 $ 2,143 $ 31,132 Ending balance: Individually evaluated for impairment $ 2,775 $ 22 $ — $ 6,489 $ — $ — $ 9,286 Collectively evaluated for impairment 4,433 1,559 676 9,495 65 2,143 18,371 Loans acquired with deteriorated credit quality 1,726 590 15 1,142 2 — 3,475 Total allowance for loan and lease losses $ 8,934 $ 2,171 $ 691 $ 17,126 $ 67 $ 2,143 $ 31,132 June 30, 2019 Commercial Real Estate Residential Real Estate Construction, Land Development, and Other Land Commercial and Industrial Installment and Other Lease Financing Receivables Total Loans and leases ending balance: Individually evaluated for impairment $ 18,707 $ 2,899 $ — $ 24,278 $ — $ — $ 45,884 Collectively evaluated for impairment 1,141,705 656,329 247,728 1,275,922 12,609 188,420 3,522,713 Loans acquired with deteriorated credit quality 151,127 118,534 4,220 20,370 300 — 294,551 Total loans and leases $ 1,311,539 $ 777,762 $ 251,948 $ 1,320,570 $ 12,909 $ 188,420 $ 3,863,148 The Company increased the allowance for loan and lease losses by $9.5 million and $19.4 million for the three and six months ended June 30, 2020, respectively, and by $4.0 million and $5.9 million for the three and six months ended June 30, 2019, respectively. For acquired impaired loans, the Company increased the allowance for loan and lease losses by $434,000 and $2.0 million for the three and six months ended June 30, 2020, respectively, and by $629,000 and $740,000 for the three and six months ended June 30, 2019, respectively For loans individually evaluated for impairment, the Company increased the allowance for loan and lease losses by $579,000 and $3.3 million for the three and six months ended June 30, 2020, respectively, and by $1.7 million and $2.6 million for the three and six months ended June 30, 2019, respectively. For loans collectively evaluated for impairment, the Company increased the allowance for loan and lease losses by $8.4 million and $14.1 million for the three and six months ended June 30, 2020, respectively, and by $1.7 million and $2.6 million for the three and six months ended June 30, 2019, respectively. An allowance for loan and lease loss allocation has not been made for Paycheck Protection Program (“PPP”) loans as the loans have a 100% SBA guarantee. On a quarterly basis, the Company assesses the collectability of its government guarantee using historical experience. The following and June 30, 2020 Recorded Investment Unpaid Principal Balance Related Allowance With no related allowance recorded Commercial real estate $ 24,950 $ 91,211 $ — Residential real estate 1,534 1,624 — Construction, land development, and other land 4,189 4,216 — Commercial and industrial 16,774 43,215 — With an allowance recorded Commercial real estate 11,801 47,249 3,525 Residential real estate 271 274 80 Commercial and industrial 18,771 59,869 10,409 Total impaired loans $ 78,290 $ 247,658 $ 14,014 December 31, 2019 Recorded Investment Unpaid Principal Balance Related Allowance With no related allowance recorded Commercial real estate $ 16,556 $ 19,808 $ — Residential real estate 2,165 2,253 — Construction, land development, and other land 2,644 3,000 — Commercial and industrial 19,211 20,398 — With an allowance recorded Commercial real estate 9,840 10,691 2,614 Residential real estate 233 233 124 Commercial and industrial 18,092 19,285 7,952 Total impaired loans $ 68,741 $ 75,668 $ 10,690 The following tables summarize the average recorded investment and interest income recognized for loans and leases considered impaired, which excludes acquired impaired loans, for the six months ended: June 30, 2020 Average Recorded Investment Interest Income Recognized With no related allowance recorded Commercial real estate $ 20,544 $ 555 Residential real estate 1,398 15 Construction, land development, and other land 3,094 220 Commercial and industrial 16,651 262 With an allowance recorded Commercial real estate 13,402 339 Residential real estate 512 21 Commercial and industrial 22,948 746 Total impaired loans $ 78,549 $ 2,158 June 30, 2019 Average Recorded Investment Interest Income Recognized With no related allowance recorded Commercial real estate $ 8,094 $ 187 Residential real estate 1,785 27 Commercial and industrial 11,583 223 With an allowance recorded Commercial real estate 6,793 155 Residential real estate 219 4 Commercial and industrial 12,043 247 Total impaired loans $ 40,517 $ 843 The following June 30, 2020 Commercial Real Estate Residential Real Estate Construction, Land Development, and Other Land Commercial and Industrial Paycheck Protection Program Installment and Other Lease Financing Receivables Total Pass $ 1,012,490 $ 551,885 $ 232,121 $ 1,053,606 $ 611,664 $ 3,257 $ 172,443 $ 3,637,466 Watch 139,224 20,614 3,472 175,207 — 273 — 338,790 Special Mention 37,306 3,731 1,437 52,739 — — 2,242 97,455 Substandard 35,531 3,750 4,189 36,112 — 2 1,574 81,158 Doubtful — — — — — — 569 569 Loss — — — — — — — — Total $ 1,224,551 $ 579,980 $ 241,219 $ 1,317,664 $ 611,664 $ 3,532 $ 176,828 $ 4,155,438 December 31, 2019 Commercial Real Estate Residential Real Estate Construction, Land Development, and Other Land Commercial and Industrial Installment and Other Lease Financing Receivables Total Pass $ 984,881 $ 584,363 $ 247,775 $ 1,087,856 $ 6,013 $ 177,696 $ 3,088,584 Watch 99,803 21,856 18,181 159,282 302 8 299,432 Special Mention 27,484 3,648 4,684 26,944 — 1,799 64,559 Substandard 28,460 1,732 2,644 40,574 1 728 74,139 Doubtful — — — — — 279 279 Loss — — — — — — — Total $ 1,140,628 $ 611,599 $ 273,284 $ 1,314,656 $ 6,316 $ 180,510 $ 3,526,993 The following tables summarize contractual delinquency information for acquired non-impaired and originated loans and leases by category at June 30, 2020 and December 31, 2019: June 30, 2020 30-59 Days Past Due 60-89 Days Past Due Greater than 90 Days and Accruing Non- accrual Total Past Due Current Total Commercial real estate $ 2,864 $ 2,150 $ — $ 17,963 $ 22,977 $ 1,201,574 $ 1,224,551 Residential real estate 2,302 349 — 1,780 4,431 575,549 579,980 Construction, land development, and other land — — — — — 241,219 241,219 Commercial and industrial 3,298 360 — 19,100 22,758 1,294,906 1,317,664 Paycheck Protection Program — — — — — 611,664 611,664 Installment and other 4 36 — 2 42 3,490 3,532 Lease financing receivables 912 396 — 1,660 2,968 173,860 176,828 Total $ 9,380 $ 3,291 $ — $ 40,505 $ 53,176 $ 4,102,262 $ 4,155,438 December 31, 2019 30-59 Days Past Due 60-89 Days Past Due Greater than 90 Days and Accruing Non- accrual Total Past Due Current Total Commercial real estate $ 14,269 $ 5,153 $ — $ 12,274 $ 31,696 $ 1,108,932 $ 1,140,628 Residential real estate 3,187 460 — 1,371 5,018 606,581 611,599 Construction, land development, and other land — 4,460 — — 4,460 268,824 273,284 Commercial and industrial 7,789 3,594 — 22,151 33,534 1,281,122 1,314,656 Installment and other 133 2 — 1 136 6,180 6,316 Lease financing receivables 585 532 — 475 1,592 178,918 180,510 Total $ 25,963 $ 14,201 $ — $ 36,272 $ 76,436 $ 3,450,557 $ 3,526,993 Trouble debt restructurings (“TDRs”) are granted due to borrower financial difficulty and provide for a modification of loan repayment terms. TDRs are treated in the same manner as impaired loans for purposes of calculating the allowance for loan and lease losses. The tables below present TDRs by loan category as of June 30, 2020 and December 31, 2019: June 30, 2020 Number of Loans Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Charge-offs Specific Reserves Accruing: Commercial real estate 7 $ 2,856 $ 2,856 $ — $ 98 Commercial and industrial 2 123 123 — 101 Residential real estate 2 172 172 — — Total accruing 11 3,151 3,151 — 199 Non-accruing: Commercial real estate 6 2,840 1,911 929 55 Commercial and industrial 13 5,524 5,447 77 3,757 Residential real estate 1 91 91 — — Total non-accruing 20 8,455 7,449 1,006 3,812 Total troubled debt restructurings 31 $ 11,606 $ 10,600 $ 1,006 $ 4,011 December 31, 2019 Number of Loans Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Charge-offs Specific Reserves Accruing: Commercial real estate 5 $ 1,451 $ 1,451 $ — $ 223 Commercial and industrial 2 129 129 — 118 Residential real estate 2 191 191 — — Total accruing 9 1,771 1,771 — 341 Non-accruing: Commercial real estate 6 2,777 2,600 177 513 Commercial and industrial 11 8,048 6,096 1,952 1,312 Residential real estate 1 104 104 — — Total non-accruing 18 10,929 8,800 2,129 1,825 Total troubled debt restructurings 27 $ 12,700 $ 10,571 $ 2,129 $ 2,166 In addition, Loans modified and 2019 were: Three Months Ended Six Months Ended June 30, June 30, 2020 2019 2020 2019 Accruing: Beginning balance $ 1,725 $ 1,921 $ 1,771 $ 1,813 Additions — — — 113 Net payments (30 ) (44 ) (76 ) (49 ) Net transfers from (to) non-accrual 1,456 (348 ) 1,456 (348 ) Ending balance 3,151 1,529 3,151 1,529 Non-accruing: Beginning balance 12,117 7,119 8,800 7,314 Additions 1,375 1,182 5,633 1,428 Net payments (445 ) (815 ) (1,386 ) (726 ) Charge-offs (4,142 ) — (4,142 ) (530 ) Net transfers from (to) accrual (1,456 ) 348 (1,456 ) 348 Ending balance 7,449 7,834 7,449 7,834 Total troubled debt restructurings $ 10,600 $ 9,363 $ 10,600 $ 9,363 There were At June 30, 2020 and December 31, 2019, the During the , the

Servicing Assets

Servicing Assets	6 Months Ended
	Jun. 30, 2020
Transfers And Servicing [Abstract]
Servicing Assets	Note 7—Servicing Activity for the three and six months ended June 30, 2020 and 2019 was Three Months Ended June 30, Six Months Ended June 30, 2020 2019 2020 2019 Beginning balance $ 17,800 $ 19,534 $ 19,471 $ 19,693 Additions, net 1,262 1,449 2,655 2,551 Changes in fair value (711 ) (1,223 ) (3,775 ) (2,484 ) Ending balance $ 18,351 $ 19,760 $ 18,351 $ 19,760 Loans serviced as of and were as follows: June 30, December 31, 2020 2019 Loan portfolios serviced for: SBA guaranteed loans $ 1,278,876 $ 1,231,959 USDA guaranteed loans 123,450 119,047 Total $ 1,402,326 $ 1,351,006 Loan servicing revenue totaled $3.0 million and $2.6 million for the three months ended June 30, 2020 and 2019, respectively. Loan servicing revenue totaled $5.7 million and $5.2 million for the six months ended June 30, 2020 and 2019, respectively. Loan servicing asset revaluation, which represents the changes in fair value of servicing assets, resulted in downward valuations of $711,000 and $1.2 million for three months ended June 30, 2020 and 2019, respectively. Loan servicing asset revaluation resulted in downward valuations of $3.8 million and $2.5 million for the six months ended June 30, 2020 and 2019, respectively. The fair Generally, as interest rates rise on variable rate loans, loan prepayments increase due to an increase in refinance activity, which may result in a decrease in the fair value of servicing assets. Measurement of fair value is limited to the conditions existing and the assumptions used as of a particular point in time, and those assumptions may change over time. Refer to Note 15—Fair Value Measurement for further details.

Other Real Estate Owned

Other Real Estate Owned	6 Months Ended
	Jun. 30, 2020
Banking And Thrift [Abstract]
Other Real Estate Owned	Note 8—Other Real Estate Owned The following table presents the change in other real estate owned (“OREO”) for the three and six months ended June 30, 2020 Three Months Ended June 30, Six Months Ended June 30, 2020 2019 2020 2019 Beginning balance $ 9,273 $ 4,595 $ 9,896 $ 5,041 Acquisitions of OREO through business combination — 2,201 — 2,201 Net additions to OREO 64 510 86 536 Proceeds from sales of OREO (386 ) (702 ) (650 ) (1,057 ) Gains (losses) on sales of OREO 3 6 85 (27 ) Valuation adjustments (302 ) (79 ) (765 ) (163 ) Ending balance $ 8,652 $ 6,531 $ 8,652 $ 6,531 At June 30, 2020 and December 31, 2019, the balance of real estate owned included $1.2 million and $1.5 million, respectively, of foreclosed residential real estate properties recorded as a result of obtaining physical possession of the property. At June 30, 2020 and December 31, 2019, the recorded investment of consumer mortgage loans secured by residential real estate properties for which formal foreclosure proceedings were in process was $2.1 million. There were no internally financed sales of OREO for the three and six months ended June 30, 2020. Proceeds from internally financed sales of OREO were $183,000 for the six months ended June 30, 2019. There were no internally financed sales of OREO for the three months ended June 30, 2019.

Goodwill, Core Deposit Intangib

Goodwill, Core Deposit Intangible and Other Intangible Assets	6 Months Ended
	Jun. 30, 2020
Goodwill And Intangible Assets Disclosure [Abstract]
Goodwill, Core Deposit Intangible and Other Intangible Assets	Note 9—Goodwill, Core Deposit Intangible and Other Intangible Assets The following tables summarize the changes in the Company’s goodwill, core deposit intangible assets, and customer relationship intangible assets for the three and six months ended June 30, 2020 and 2019: Three Months Ended June 30, 2020 2019 Goodwill Core Intangible Customer Relationship Intangible Goodwill Core Intangible Customer Relationship Intangible Beginning balance $ 148,353 $ 27,285 $ 2,724 $ 128,177 $ 28,654 $ 2,992 Additions — — — 17,461 6,220 — Amortization — (1,826 ) (66 ) — (1,892 ) (66 ) Ending balance $ 148,353 $ 25,459 $ 2,658 $ 145,638 $ 32,982 $ 2,926 Accumulated amortization N/A $ 30,007 $ 558 N/A $ 22,484 $ 290 Weighted average remaining amortization period N/A 6.0 Years 9.9 Years N/A 7.0 Years 10.9 Years Six Months Ended June 30, 2020 2019 Goodwill Core Intangible Customer Relationship Intangible Goodwill Core Intangible Customer Relationship Intangible Beginning balance $ 148,353 $ 29,111 $ 2,791 $ 128,177 $ 30,360 $ 3,059 Additions — - — 17,461 6,220 — Amortization — (3,652 ) (133 ) — (3,598 ) (133 ) Ending balance $ 148,353 $ 25,459 $ 2,658 $ 145,638 $ 32,982 $ 2,926 Accumulated amortization N/A $ 30,007 $ 558 N/A $ 22,484 290 Weighted average remaining amortization period N/A 6.0 Years 9.9 Years N/A 7.0 Years 10.9 Years The Company added additional goodwill and core deposit intangible assets in conjunction with the Oak Park River Forest acquisition. Please refer to Note 3—Acquisition for further details. The following table presents the estimated amortization expense for core deposit intangible and customer relationship intangible assets remaining at June 30, 2020: Estimated Amortization 2020 $ 3,785 2021 6,998 2022 6,426 2023 4,371 2024 2,286 Thereafter 4,251 Total $ 28,117

Income Taxes

Income Taxes	6 Months Ended
	Jun. 30, 2020
Income Tax Disclosure [Abstract]
Income Taxes	Note 10—Income The Company uses an estimated annual effective tax rate method in computing its interim tax provision. This effective tax rate is based on forecasted annual pre-tax income, permanent tax differences and statutory tax rates. The effective tax rate for the six months ended June 30, 2020 and 2019 was 28.3% and 27.7%, respectively. The Company recorded discrete income tax provision of $76,000 and a benefit of $65,000 related to the exercise of stock options and vesting of restricted shares for the six months ended June 30, 2020 and 2019, respectively. Net deferred tax assets decreased to $37.1 million at compared to $38.3 million at . The net decrease in the total net deferred tax .

Deposits

Deposits	6 Months Ended
	Jun. 30, 2020
Deposits [Abstract]
Deposits	Note 11—Deposits The composition of deposits was as follows as of June 30, 2020 and December 31, 2019: June 30, December 31, 2020 2019 Non-interest-bearing demand deposits $ 1,768,675 $ 1,279,641 Interest-bearing checking accounts 503,909 338,185 Money market demand accounts 1,233,748 881,387 Other savings 525,043 475,839 Time deposits (below $250,000) 710,429 916,723 Time deposits ($250,000 and above) 216,541 255,802 Total deposits $ 4,958,345 $ 4,147,577 Time deposits of $250,000 or more included $56.0 million and $41.0 million of brokered deposits at June 30, 2020 and December 31, 2019, respectively.

Other Borrowings

Other Borrowings	6 Months Ended
	Jun. 30, 2020
Debt Disclosure [Abstract]
Other Borrowings	Note 12—Other Borrowings The following is a summary of the Company’s other borrowings as of June 30, 2020 and December 31, 2019: June 30, December 31, 2020 2019 Paycheck Protection Program Liquidity Facility $ 449,889 $ — Line of credit — — Federal Home Loan Bank advances 4,000 490,000 Securities sold under agreements to repurchase 56,525 49,638 Total $ 510,414 $ 539,638 On April 21, 2020, the Bank entered into a Letter Agreement with the Federal Reserve Bank of Chicago that allows the Bank to access the Paycheck Protection Program Liquidity Facility (the “PPPLF”). Under the terms of the PPPLF, the Bank will pledge loans originated under the PPP to the Federal Reserve Bank of Chicago as collateral for available advances under the PPPLF. Advances under the PPPLF will be an amount equal to the aggregate principal amount of PPP loans pledged by Byline Bank, carry an interest rate of 35 basis points and mature on the maturity date of the PPP loans pledged as collateral for the advance. As of June 30, 2020, the PPPLF had $449.9 million with an interest rate of 0.35% with various maturity dates in April 2022 and May 2022. Byline Bank has the capacity to borrow funds from the discount window of the Federal Reserve System. As of June 30, 2020 and December 31, 2019, there were no outstanding advances under the Federal Reserve Bank discount window line. The Company pledges loans and leases as collateral for the Federal Reserve Bank discount window borrowing. Refer At June 30, 2020, fixed-rate Federal Home Loan Bank (“FHLB”) advances totaled $4.0 million, bearing no interest rate and a maturity of May 2021. The Company’s required investment in FHLB stock is $4.50 for every $100 in advances. Securities On 195 75 The Company hedges The following June 30, December 31, 2020 2019 Available federal funds lines (1) $ 115,000 $ 115,000 Federal Reserve Bank discount window line 884,968 547,798 Federal Home Loan Bank line 1,980,351 1,390,698 (1) The June 30, 2020

Subordinated Notes and Junior S

Subordinated Notes and Junior Subordinated Debentures	6 Months Ended
	Jun. 30, 2020
Debt Disclosure [Abstract]
Subordinated Notes and Junior Subordinated Debentures	Note 13—Subordinated Notes and Junior Subordinated Debentures On June 26, 2020, the Company issued $50.0 million in 6.00% fixed-to-floating subordinated notes that mature on July 1, 2030. The subordinated notes bear a fixed interest rate of 6.00% until July 1, 2025 and a floating interest rate equal to a benchmark rate, which is expected to be three-month Secured Overnight Financing Rate plus 588 basis points thereafter until maturity. The Company may, at its option, redeem the notes, in whole or in part, on a semi-annual basis beginning on July 1, 2025, subject to obtaining the prior approval of the Federal Reserve to the extent such approval is then required. The subordinated notes are intended to qualify as Tier 2 capital for regulatory capital purposes. The transaction resulted in debt issuance costs of approximately $1.2 million that will be amortized over 10 years. On August 3, 2020, the Company issued an additional $25.0 million in 6.00% fixed-to-floating subordinated notes, that mature on July 1, 2030. These notes will be part of the same series of notes as the $50.0 million issued on June 26, 2020 and will be fungible and treated as a single series. At June 30, 2020 and December 31, 2019, the Name of Trust Aggregate Principal Amount June 30, 2020 Aggregate Principal Amount December 31, 2019 Stated Maturity Contractual Rate at June 30, 2020 Interest Rate Spread Metropolitan $ 35,000 $ 35,000 March 3.09 % Three-month LIBOR + 2.79% RidgeStone Capital Trust I — 1,500 June 30, 2033 n/a Five-year LIBOR + 3.50% First Evanston Bancorp Trust I 10,000 10,000 March 15, 2035 2.09 % Three-month LIBOR + 1.78% Total liability, at par 45,000 46,500 Discount (8,794 ) (9,166 ) Total liability, at carrying value $ 36,206 $ 37,334 In 2004, the As part of the Ridgestone acquisition, the Company assumed the obligations to RidgeStone Capital Trust I of $1.5 million in principal amount, which was formed for the issuance of trust preferred securities. Beginning on June 30, 2008, the interest rate reset to the five-year LIBOR plus 3.50% (6.38% at December 31, 2019), which was in effect until June 30, 2023 and updated every five years. Interest was paid on a quarterly basis. The Company had the right to redeem the debentures, in whole or in part, on any interest payment date on or after June 30, 2008. As part of the First Evanston acquisition, the Company assumed the obligations to First Evanston Bancorp Trust I of $10.0 million in principal amount, which was formed for the issuance of trust preferred securities. Beginning on March 15, 2010, the interest rate reset to the three-month LIBOR plus 1.78% (2.09% and 3.67% at June 30, 2020 and December 31, 2019, respectively), which is in effect until the debentures mature in 2035. Interest is paid on a quarterly basis. The Company has the right to redeem the debentures, in whole or in part, on any interest payment date on or after March 2010. The Company has the option to defer interest payments on the debentures from time to time for a period not to exceed five consecutive years. Accrued The Trusts of default under the indenture governing the notes has occurred and is continuing, the preferred securities will rank senior to the common securities in right of payment.

Commitments and Contingent Liab

Commitments and Contingent Liabilities	6 Months Ended
	Jun. 30, 2020
Commitments And Contingencies Disclosure [Abstract]
Commitments and Contingent Liabilities	Note 14—Commitments Legal —I n th e ordinar y cours e o f business , th e Compan y an d Ban k hav e various outstandin g commitment s an d contingen t liabilitie s tha t ar e no t recognize d i n th e accompanyin g consolidated financia l statements . I n addition , th e Compan y ma y b e a defendan t i n certai n claim s an d lega l action s arisin g i n the ordinar y cours e o f business . I n th e opinio n o f management , afte r consultatio n wit h lega l counsel , th e ultimate dispositio n o f thes e matter s i s currentl y no t expecte d t o hav e a materia l advers e effec t o n th e Company’s Consolidated Financial Statements. Operating s —The Company has entered into various operating lease agreements primarily for facilities and land on which banking facilities are located. Certain lease agreements have renewal options at the end of the original lease term and certain lease agreements have escalation clauses in the rent payments. The minimum Minimum Commitments 2020 $ 2,258 2021 4,148 2022 2,380 2023 1,382 2024 1,249 Thereafter 2,148 Total $ 13,565 The Company’s During t C Commitments t —The Company is party to financial instruments with off-balance sheet risk in the normal course of business to meet the financing needs of its customers. These financial instruments include commitments to extend credit and standby letters of credit. Those instruments involve, to varying degrees, elements of credit and interest rate risk in excess of the amount recognized in the Consolidated Statements of Financial Condition. The contractual or notional amounts of those instruments reflect the extent of involvement the Company has in particular classes of financial instruments. The Company’s exposure The following June 30, 2020 December 31, 2019 Fixed Rate Variable Total Fixed Variable Total Commitments to extend credit $ 81,722 $ 962,873 $ 1,044,595 $ 55,852 $ 908,382 $ 964,234 Letters of credit 692 62,207 62,899 724 65,514 66,238 Total $ 82,414 $ 1,025,080 $ 1,107,494 $ 56,576 $ 973,896 $ 1,030,472 Commitments to extend credit are agreements to lend to a customer as long as there is no violation of any condition established in the contract. Commitments generally have fixed expiration dates or other termination clauses and may require payment of a fee. Since many of the commitments are expected to expire without being drawn upon, the total commitment amount does not necessarily represent future cash requirements. The Company evaluates each customer’s creditworthiness on a case-by-case basis. The amount of collateral obtained, if deemed necessary by the Company upon extension of credit, is based on management’s credit evaluation of the counterparty. Collateral is primarily obtained in the form of commercial and residential real estate (including income producing commercial properties). Letters Commitments

Fair Value Measurement

Fair Value Measurement	6 Months Ended
	Jun. 30, 2020
Fair Value Disclosures [Abstract]
Fair Value Measurement	Note 15—Fair Value Measurement Fair These types Level 1 —Quoted prices in active markets for identical assets or liabilities. Level 2 —Quoted prices for similar instruments in active markets, quoted prices for identical or similar instruments in markets that are not active and model-derived valuations whose inputs are observable or whose significant value drivers are observable. Level 3 —Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the asset or liability. Unobservable inputs are used to measure fair value to the extent that observable inputs are not available. The Company’s own data used to develop unobservable inputs may be adjusted for market considerations when reasonably available. The The Company used the Securities available-for-sal e —The Company obtains fair value measurements from an independent pricing service. Management reviews the procedures used by the third party, including significant inputs used in the fair value calculations. The fair value measurements consider observable data that may include dealer quotes, market spreads, cash flows, the U.S. Treasury yield curve, live trading levels, trade execution data, market consensus prepayment speeds, credit information and the bond’s terms and conditions, among other things. When market quotes are not readily accessible or available, alternative approaches are utilized, such as matrix or model pricing. The Company’s methodology for pricing non-rated bonds focuses on three distinct inputs: equivalent rating, yield and other pricing terms. To determine the rating for a given non-rated municipal bond, the Company references a publicly issued bond by the same issuer if available as well as other additional key metrics to support the credit worthiness. Typically, pricing for these types of bonds would require a higher yield than a similar rated bond from the same issuer. A reduction in price is applied to the rating obtained from the comparable bond, as the Company believes if liquidated, a non-rated bond would be valued less than a similar bond with a verifiable rating. The reduction applied by the Company is one notch lower (i.e. a “AA” rating for a comparable bond would be reduced to “AA-” for the Company’s valuation). In 2020 and 2019, all of the ratings derived by the Company were “BBB” or better with and without comparable bond proxies. The fair value measurement of municipal bonds is sensitive to the rating input, as a higher rating typically results in an increased valuation. The remaining pricing inputs used in the bond valuation are observable. Based on the rating determined, the Company obtains a corresponding current market yield curve available to market participants. Other terms including coupon, maturity date, redemption price, number of coupon payments per year, and accrual method are obtained from the individual bond term sheets. Equity and other securities —The Company utilizes the same fair value measurement methodology for equity and other securities as detailed in the securities available-sale portfolio above. Servicing s —Fair value is based on a loan-by-loan basis taking into consideration the original term to maturity, the current age of the loan and the remaining term to maturity. The valuation methodology utilized for the servicing assets begins with generating estimated future cash flows for each servicing asset, based on their unique characteristics and market-based assumptions for prepayment speeds and costs to service. The present value of the future cash flows are then calculated utilizing market-based discount rate assumptions. Derivative s —Interest rate derivatives are valued by a third party, using models that primarily use market observable inputs, such as yield curves, and are validated by comparison with valuations provided by the respective counterparties. Derivative financial instruments are included in other assets and other liabilities in the Consolidated Statements of Financial Condition. The following Fair Value Measurements Using June 30, 2020 Fair Value Level 1 Level 2 Level 3 Financial assets Securities available-for-sale U.S. Treasury Notes $ 31,095 $ 31,095 $ — $ — U.S. Government agencies 137,795 — 137,795 — Obligations of states, municipalities, and political subdivisions 125,156 — 125,156 — Mortgage-backed securities; residential Agency 679,865 — 679,865 — Non-Agency 77,291 — 77,291 — Mortgage-backed securities; commercial Agency 239,054 — 239,054 — Non-Agency 31,221 — 31,221 — Corporate securities 56,278 — 56,278 — Asset-backed securities 49,116 — 49,116 — Equity and other securities, at fair value Mutual funds 2,996 2,996 — — Equity securities 5,185 — 4,501 684 Servicing assets 18,351 — — 18,351 Derivative assets 20,084 — 20,084 — Financial liabilities Derivative liabilities 21,393 — 21,393 — Fair Value Measurements Using December 31, 2019 Fair Value Level 1 Level 2 Level 3 Financial assets Securities available-for-sale U.S. Treasury Notes $ 41,830 $ 41,830 $ — $ — U.S. Government agencies 164,950 — 164,950 — Obligations of states, municipalities, and political subdivisions 94,832 — 94,832 — Mortgage-backed securities; residential Agency 490,236 — 490,236 — Non-Agency 109,822 — 109,822 — Mortgage-backed securities; commercial Agency 159,701 — 159,701 — Non-Agency 31,274 — 31,274 — Corporate securities 49,330 — 49,330 — Asset-backed securities 44,317 — 44,317 — Equity and other securities, at fair value Mutual funds 2,952 2,952 — — Equity securities 5,079 — 4,379 700 Servicing assets 19,471 — — 19,471 Derivative assets 7,960 — 7,960 — Financial liabilities Derivative liabilities 8,519 — 8,519 — The Company did not have any transfers The following table presents additional information about financial assets measured at fair value on recurring basis for which the Company used significant unobservable inputs (Level 3): Six Months Ended June 30, 2020 2019 2020 2019 Investment Securities Servicing Assets Balance, beginning of period $ 700 $ 886 $ 19,471 $ 19,693 Additions, net — — 2,655 2,551 Amortization — 3 — — Change in fair value (19 ) 1 (3,775 ) (2,484 ) Balance, end of period $ 681 $ 890 $ 18,351 $ 19,760 The following Financial Instruments Valuation Technique Unobservable Inputs Range of Inputs Weighted Average Range Impact to Valuation from an Increased or Higher Input Value Single issuer trust preferred Discounted cash flow Discount rate 4.9% - 5.4% 5.5 % Decrease Servicing assets Discounted cash flow Prepayment speeds 1.7% - 29.2% 16.0 % Decrease Discount rate 2.1% - 37.6% 11.5 % Decrease Expected weighted average loan life 0.1 - 8.8 years 3.7 years Increase The Company used the Impaired ) —Impaired loans, other than those existing on the date of a business acquisition, are primarily carried at the fair value of the underlying collateral, less estimated costs to sell, if the loan is collateral dependent. Valuations of impaired loans that are collateral dependent are supported by third party appraisals in accordance with the Bank’s credit policy. Other valuation methods include analysis of discounted cash flows, which measures the present value of expected future cash flows discounted at the loan’s effective interest rate. Impaired loans that are not collateral dependent are not material. Assets e —Assets held for sale consist of former branch locations and real estate previously purchased for expansion. Assets are considered held for sale when management has approved to sell the assets following a branch closure or other events. The properties are being actively marketed and transferred to assets held for sale based on the lower of carrying value or its fair value, less estimated costs to sell. Other real estate owne d —Certain assets held within other real estate owned represent real estate or other collateral that has been adjusted to its estimated fair value, less cost to sell, as a result of transferring from the loan portfolio at the time of foreclosure or repossession and based on management’s periodic impairment evaluation. From time to time, non-recurring fair value adjustments to other real estate owned are recorded to reflect partial write-downs based on an observable market price or current appraised value of property. Adjustments Fair Value Measurements Using June 30, 2020 Fair Value Level 1 Level 2 Level 3 Non-recurring Impaired loans (excluding acquired impaired loans) Commercial real estate $ 33,226 $ — $ — $ 33,226 Residential real estate 1,725 — — 1,725 Construction, land development, and other land 4,189 — — 4,189 Commercial and industrial 25,136 — — 25,136 Assets held for sale 15,264 — — 15,264 Other real estate owned 8,652 — — 8,652 Fair Value Measurements Using December 31, 2019 Fair Value Level 1 Level 2 Level 3 Non-recurring Impaired loans (excluding acquired impaired loans) Commercial real estate $ 23,782 $ — $ — $ 23,782 Residential real estate 2,274 — — 2,274 Construction, land development, and other land 2,644 — — 2,644 Commercial and industrial 29,351 — — 29,351 Assets held for sale 15,362 — — 15,362 Other real estate owned 9,896 — — 9,896 The following Cash and cash equivalent s —For these short-term instruments, the carrying amount is a reasonable estimate of fair value. Securities y —The Company obtains fair value measurements from an independent pricing service. Management reviews the procedures used by the third party, including significant inputs used in the fair value calculations. The fair value measurements consider observable data that may include dealer quotes, market spreads, cash flows, the U.S. Treasury yield curve, live trading levels, trade execution data, market consensus prepayment speeds, credit information and the bond’s terms and conditions, among other things. When market quotes are not readily accessible or available, alternative approaches are utilized, such as matrix or model pricing. Restricted k —The fair value has been determined to approximate cost. Loans held for — The fair value of loans held for sale are based on quoted market prices, where available, and determined by discounted estimated cash flows using interest rates approximating the Company’s current origination rates for similar loans adjusted to reflect the inherent credit risk. Loan and lease receivables, net —For certain variable rate loans that reprice frequently and with no significant changes in credit risk, fair value is estimated at carrying value. The fair value of other types of loans is estimated using an exit price notion. It is estimated by discounting f uture cash flows, using current rates at which similar loans would be made to borrowers with similar credit ratings and for the same remaining maturities. Deposits —The fair value of demand deposits, savings accounts, and certain money market deposits is the amount payable on demand at the reporting date. The fair value of fixed-maturity certificates of deposit is estimated by discounting future cash flows, using rates currently offered for deposits of similar remaining maturities. Paycheck Protection Program Liquidity Facility —The carrying amount approximates fair value. Federal —The fair value of FHLB advances is estimated by discounting the agreements based on maturities using rates currently offered for FHLB advances of similar remaining maturities adjusted for prepayment penalties that would be incurred if the borrowings were paid off on the measurement date. Securities e —The carrying amount approximates fair value due to maturities of less than ninety days. Subordinated notes —The fair value is based on available market prices. Junior subordinated debenture s —The fair value of junior subordinated debentures, in the form of trust preferred securities, is determined using rates currently available to the Company for debt with similar terms and remaining maturities. Accrued interest —The carrying amount approximates fair value. Commitments t —The fair values of these off-balance sheet commitments to extend credit and commercial and letters of credit are not considered practicable to estimate because of the lack of quoted market prices and the inability to estimate fair value without incurring excessive costs. The estimated not carried at fair value June 30, December 31, Fair Value 2020 2019 Hierarchy Level Carrying Amount Estimated Fair Value Carrying Amount Estimated Fair Value Financial assets Cash and due from banks 1 $ 51,818 $ 51,818 $ 48,228 $ 48,228 Interest bearing deposits with other banks 2 88,113 88,113 32,509 32,509 Securities held-to-maturity 2 4,404 4,582 4,412 4,498 Other restricted stock 2 6,232 6,232 22,127 22,127 Loans held for sale 3 3,031 3,357 11,732 12,935 Loans and lease receivables, net (less impaired loans at fair value 3 4,275,546 4,211,233 3,695,674 3,661,724 Accrued interest receivable 3 15,633 15,633 13,283 13,283 Financial liabilities Non-interest-bearing deposits 2 1,768,675 1,768,675 1,279,641 1,279,641 Interest-bearing deposits 2 3,189,670 3,193,090 2,867,936 2,873,380 Accrued interest payable 2 1,928 1,928 3,677 3,677 Paycheck Protection Program Liquidity Facility 2 449,889 449,889 — — Federal Home Loan Bank advances 2 4,000 4,000 490,000 490,000 Securities sold under repurchase agreement 2 56,525 56,525 49,638 49,638 Subordinated notes 2 50,000 49,999 — — Junior subordinated debentures 3 36,206 40,310 37,334 42,881

Derivative Instruments and Hedg

Derivative Instruments and Hedge Activities	6 Months Ended
	Jun. 30, 2020
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Derivative Instruments and Hedge Activities	Note 16—Derivative Instruments and Hedge Activities As required by ASC 815, the Company records all derivatives on the balance sheet at fair value. The accounting for changes in the fair value of derivatives depends on the intended use of the derivative, whether the Company has elected to designate a derivative in a hedging relationship and apply hedge accounting and whether the hedging relationship has satisfied the criteria necessary to apply hedge accounting. The Company records derivative assets and derivative liabilities on the Consolidated Statements of Financial Condition within accrued interest receivable and other assets and accrued interest payable and other liabilities, respectively. The following tables present the fair value of the Company’s derivative financial instruments and classification on the Consolidated Statements of Financial Condition as of June 30, 2020 and December 31, 2019: June 30, 2020 December 31, 2019 Fair Value Fair Value Notional Amount Other Assets Other Liabilities Notional Amount Other Assets Other Liabilities Derivatives not designated as hedging instruments Other interest rate derivatives 373,862 20,084 21,370 332,056 7,960 8,507 Other credit derivatives 8,870 — 23 9,302 — 12 Total derivatives $ 382,732 $ 20,084 $ 21,393 $ 341,358 $ 7,960 $ 8,519 Interest rate swaps designated as cash flow hedges —There were no cash flow hedges outstanding at June 30, 2020 and December 31, 2019. In September 2019, the Company terminated $250.0 million interest rate swaps designated as cash flow hedges of interest payments associated with certain FHLB advances, which were executed to reduce interest rate risk in a declining rate environment. The transaction resulted in a net loss of $383,000, net of tax, which was the clean value at the termination date. As of June 30, 2020, the remaining balance in accumulated other comprehensive income was $329,000, which is being amortized over the original life of the cash flow hedge. At June 30, 2020, the Company estimates $85,000 of the unrealized loss to be reclassified as an increase to interest expense during the next twelve months. The following table reflects the net gains (losses) recorded in accumulated other comprehensive income (loss) and the Consolidated Statements of Operations relating to the cash flow derivative instruments for the six months ended: June 30, 2020 June 30, 2019 Amount of Loss Recognized in OCI Amount of Loss Reclassified from OCI to Income as an Increase to Interest Expense Amount of Gain (Loss) Recognized in Other Non-Interest Income Amount of Loss Recognized in OCI Amount of Gain Reclassified from OCI to Income as a Decrease to Interest Expense Amount of Gain (Loss) Recognized in Other Non-Interest Income Interest rate swaps $ — $ (42 ) $ — $ (5,234 ) $ 1,280 $ — Derivatives not designated as hedges are not speculative and are used to manage the Company’s exposure to interest rate movements and other identified risks but do not meet the strict hedge accounting requirements and/or the Company has not elected to apply hedge accounting. Changes in the fair value of derivatives not designated in hedging relationships are recorded directly in earnings . Other interest rate derivatives — The Company also enters into derivative transactions through products with its commercial customers and simultaneously enters into an offsetting interest rate derivative transaction with third-parties. These transactions allow the Company's borrowers to effectively convert a variable rate loan into a fixed rate loan. The total combined notional amount was $373.9 million as of June 30, 2020 with maturities ranging from January 2022 March 2030 These instruments are inherently subject to market risk and credit risk. Market risk is associated with changes in interest rates and credit risk relates to the Company’s risk of loss when the counterparty to a derivative contract fails to perform according to the terms of the agreement. Market and credit risks are managed and monitored as part of the Company’s overall asset-liability management process. The credit risk related to derivatives entered into with certain qualified borrowers is managed through the Company’s loan underwriting process. The Company’s loan underwriting process also approves the Bank’s swap counterparty used to mirror the borrowers’ swap. The Company has a bilateral agreement with each swap counterparty that provides that fluctuations in derivative values are to be fully collateralized with either cash or securities. The following table reflects other interest rate derivatives as of June 30, 2020: Notional amounts $ 373,862 Derivative assets fair value 20,084 Derivative liabilities fair value 21,370 Weighted average pay rates 4.49 % Weighted average receive rates 2.68 % Weighted average maturity 6.4 years Other credit derivatives — The Company has entered into risk participation agreements with counterparty banks to assume a portion of the credit risk related to borrower transactions. The credit risk related to these other credit derivatives is managed through the Company’s loan underwriting process. The total notional amount was $8.9 million and $9.3 million as of June 30, 2020 and December 31, 2019, respectively. The fair value of the other credit derivatives are reflected in other liabilities with corresponding gains or losses reflected in non-interest income. The Company has agreements with its derivative counterparties that contain a cross-default provision under which if the Company defaults on any of its indebtedness, including default where repayment of the indebtedness has not been accelerated by the lender, then the Company could also be declared in default on its derivative obligations. The Company also has agreements with certain derivative counterparties that contain a provision where if the Company fails to maintain its status as a well or adequately capitalized institution, then the counterparty could terminate the derivative positions and the Company would be required to settle its obligations resulted in a net asset position. The following table reflects amounts included in non-interest income in the Consolidated Statements of Operations relating to derivative instruments that are not designated in a hedging relationship for the three and six months ended June 30, 2020 and 2019: Three Months Ended Six Months Ended June 30, June 30, 2020 2019 2020 2019 Other interest rate derivatives $ (17 ) $ (221 ) $ (740 ) $ (372 ) Other credit derivatives 1 (3 ) (11 ) (4 ) Total $ (16 ) $ (224 ) $ (751 ) $ (376 ) The Company records interest rate derivatives subject to master netting agreements at their gross value and does not offset derivative asset and liabilities on the Consolidated Statements of Financial Condition. The table below summarizes the Company’s interest rate derivatives and offsetting positions as of: June 30, 2020 December 31, 2019 Derivative Assets Fair Value Derivative Liabilities Fair Value Derivative Assets Fair Value Derivative Liabilities Fair Value Gross amounts recognized $ 20,084 $ 21,393 $ 7,960 $ 8,519 Less: Amounts offset in the Consolidated Statements of Financial Condition — — — — Net amount presented in the Consolidated Statements of Financial Condition $ 20,084 $ 21,393 $ 7,960 $ 8,519 Gross amounts not offset in the Consolidated Statements of Financial Condition Offsetting derivative positions — — (1 ) (1 ) Collateral posted (20,084 ) (21,261 ) (7,959 ) (8,518 ) Net credit exposure $ — $ 132 $ — $ — As of June 30, 2020, the fair value of derivatives in a net liability position, which includes accrued interest but excludes any adjustment for nonperformance risk, related to these agreements was $21.4 million. The Company has posted $21.3 collateral related to these agreements as of June 30, 2020. If the Company had breached any of these provisions at June 30, 2020, it could have been required to settle its obligations under the agreements at their termination value of $21.4 million. For purposes of this disclosure, the amount of posted collateral by the counterparties is limited to the amount offsetting the derivative asset and derivative liability.

Share-Based Compensation

Share-Based Compensation	6 Months Ended
	Jun. 30, 2020
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Share-Based Compensation	Note 17 – Share-Based Compensation In June 2017, the Company adopted the 2017 Omnibus Incentive Compensation Plan (the “Omnibus Plan”) in connection with our IPO. The Omnibus Plan provides for the grant of stock options, stock appreciation rights, restricted stock, restricted stock units, dividend equivalent rights and other equity-based, equity-related or cash-based awards. A total of 1,550,000 shares of our common stock have been reserved for issuance under the Omnibus Plan. As of June 30, 2020, there were 995,845 shares available for future grants under the Omnibus Plan. On July 6, 2017, in conjunction with the completion of the IPO, the Company granted 58,900 restricted shares of the Company’s common stock to certain key employees, pursuant to the Omnibus Plan. The restricted shares will cliff vest on the third anniversary of the grant date, subject to continued employment. A total of 11,898 restricted shares were also granted during the year ended December 31, 2017 in connection with the recruitment of employees. These restricted shares vest ratably over a four year period. During 2018, the Company granted 131,157 shares of restricted common stock, par value $0.01 per share. Of this total, 102,559 restricted shares will vest ratably over four years on each anniversary of the grant date, 15,165 restricted shares will vest ratably over three years on each anniversary of the grant date, and 2,268 restricted shares will vest on the first anniversary of the grant date, all subject to continued employment. In addition, 11,165 performance-based restricted shares were included in the 2018 grant. The number of shares which may be earned under the award is dependent upon the Company’s return on average assets over a three-year During 2019, the Company granted 189,647 shares of restricted common stock, par value $0.01 per share. Of this total, 111,823 restricted shares will vest ratably over four years on each anniversary of the grant date, 72,570 restricted shares will vest ratably over three years on each anniversary of the grant date, 683 restricted shares will vest on the first anniversary of the grant date, and 4,571 share have vested, all subject to continued employment. In addition, 20,975 performance-based restricted shares were included in the 2019 grants. The number of shares which may be earned under the award is dependent upon the Company’s return on average assets, weighted equally, over a three-year During February 2020, the Company granted 174,179 shares of restricted common stock, par value $0.01 per share. Of this total, 103,465 restricted shares will vest ratably over four years on each anniversary of the grant date and 38,786 restricted shares will vest ratably over three years on each anniversary of the grant date, all subject to continued employment. In addition, 31,928 performance-based restricted shares were included in the February 2020 grant. The number of shares which may be earned under the award is dependent upon the Company’s return on average assets, weighted equally, over a three-year The following table discloses the changes in restricted shares for the six months ended June 30, 2020: Omnibus Plan Number of Shares Weighted Average Grant Date Fair Value Beginning balance, January 1, 2020 328,653 $ 19.94 Granted 174,179 17.52 Vested (53,832 ) 20.76 Forfeited (143 ) 17.50 Ending balance outstanding at June 30, 2020 448,857 $ 18.90 A total of 53,832 restricted shares vested during the six months ended June 30, 2020. A total of 48,491 restricted shares vested during the year ended December 31, 2019. The fair value of restricted shares that vested during the six months ended June 30, 2020 was $593,000. The fair value of restricted shares that vested during the year ended December 31, 2019 was $900,000. The Company recognizes share-based compensation based on the estimated fair value of the restricted stock at the grant date. Share-based compensation expense is included in non-interest expense in the Consolidated Statements of Operations. The following table summarizes restricted stock compensation expense for the six months ended June 30, 2020 and 2019: Six Months Ended June 30, 2020 2019 Total share-based compensation - restricted stock $ 1,336 $ 807 Income tax benefit 372 225 Unrecognized compensation expense 6,329 4,829 Weighted-average amortization period remaining 2.7 years 3.0 years The fair value of the unvested restricted stock awards at June 30, 2020 was $5.9 million. In October 2014, the Company adopted the Byline Bancorp, Inc. Equity Incentive Plan (“BYB Plan”). The maximum number of shares available for grants under this plan was 2,476,122 shares. During 2016 and 2015, the Company granted options to purchase 212,400 and 1,634,568 shares, respectively, under this plan. The Company did not grant any stock options during the year ended December 31, 2017. In June 2017, the Board of Directors terminated the BYB Plan and no future grants can be made under this plan. Options to purchase a total of 1,390,579 shares remain outstanding under the BYB Plan at June 30, 2020. The types of stock options granted under the BYB Plan were Time Options and Performance Options. The exercise price of each option is equal to the fair value of the stock as of the date of grant. These option awards have vesting periods ranging from one to five years and have 10-year The vesting of Time Options is conditional based on completion of service. Performance Options have conditional vesting based on either performance targets or market performance. Certain Performance Options’ performance goals will be satisfied (in whole or in part) if the Bank achieves various performance targets such as profitability, asset quality, and conditional based on market performance, as outlined in the BYB Plan. Each of the performance goals identified are measured for achievement (or failure to achieve) independent of each other. In October 2017, the Board of Directors determined that the Performance Option goals were satisfied, in whole, and these Performance Options converted to Time Options. As a result of the previous completion of service, 414,894 performance options vested on October 3, 2017. The fair values of the stock options were determined using the Black-Scholes-Merton model for Time Options and a Monte Carlo simulation model for Performance Options. The following table discloses the activity in shares subject to options and the weighted average exercise prices, in actual dollars, for the six months ended June 30, 2020: BYB Plan Number of Shares Weighted Average Exercise Price Intrinsic Value Weighted Average Remaining Contractual Term (in Years) Beginning balance, January 1, 2020 1,410,075 $ 11.38 $ 11,542 5.4 Exercised (19,496 ) 13.00 $ 139 Expired — Ending balance outstanding at June 30, 2020 1,390,579 $ 11.36 $ 2,574 4.9 Exercisable at June 30, 2020 1,390,579 $ 11.36 $ 2,574 4.9 A total of 19,496 stock options were exercised during the six months ended June 30, 2020. During the six months ended June 30, 2020, proceeds from the exercise of stock options were $253,000 and related tax benefit was $39,000. A total of 127,997 stock options were exercised during the year ended December 31, 2019. During the year ended December 31, 2019, proceeds from the exercise of stock options were $1.9 million and related tax benefit was $145,000. A total of 20,000 stock options vested during the six months ended June 30, 2020. The Company recognizes share-based compensation based on the estimated fair value of the option at the grant date. Forfeitures are estimated based upon industry standards. Share-based compensation expense is included in non-interest expense in the Consolidated Statements of Operations. The following table summarizes stock option compensation expense for the six months ended June 30, 2020 and 2019 : Six Months Ended June 30, 2020 2019 Total share-based compensation (benefit) - stock options $ 7 $ (133 ) Income tax benefit (expense) 2 (37 ) Unrecognized compensation expense - stock options — 35 Weighted-average amortization period remaining 0.0 years 0.7 years Pursuant to the terms of the Merger Agreement, upon the Effective Time, each outstanding First Evanston Option held by a participant in the First Evanston Bancorp, Inc. Stock Incentive Plan (the “FEB Plan”) ceased to represent a right to acquire shares of First Evanston common stock and was assumed and converted automatically into a fully vested and exercisable adjusted option to purchase shares of Byline common stock (each an “Adjusted Option”). In accordance with the Merger Agreement, the number of shares of Byline common stock to which each such Adjusted Option relates is equal to the product (rounded down to the nearest whole share of Byline common stock) of: (a) the number of shares of First Evanston common stock subject to the First Evanston Option immediately prior to May 31, 2018, multiplied by (ii) 4.725. Each Adjusted Option has an exercise price per share of Byline common stock equal to the quotient (rounded up to the nearest whole cent) of (x) the per share exercise price of such First Evanston Option immediately prior to May 31, 2018, divided by (y) 4.725. The description of the conversion process is based on, and qualified by, the Merger Agreement. The following table discloses the activity in shares subject to options under the FEB Plan and the weighted average exercise prices, in actual dollars, for the six months ended June 30, 2020: FEB Plan Number of Shares Weighted Average Exercise Price Intrinsic Value Weighted Average Remaining Contractual Term (in Years) Beginning balance, January 1, 2020 511,169 $ 11.35 $ 4,204 4.4 Exercised (41,102 ) $ 11.65 $ 313 Expired — Ending balance outstanding at June 30, 2020 470,067 $ 11.32 $ 837 3.8 Exercisable at June 30, 2020 470,067 $ 11.32 $ 837 3.8 A total of 41,102 stock options were exercised during the six months ended June 30, 2020. During the six months ended June 30, 2020, proceeds from the exercise of stock options were $479,000 and related tax benefit was $87,000. A total of 113,214 stock options were exercised during the year ended December 31, 2019. During the year ended December 31, 2019, proceeds from the exercise of stock options were $1.3 million and related tax benefit was $253,000. On April 30, 2019, the Company completed the acquisition of Oak Park River Forest. On May 15, 2019, the Company made a cash payment of $4.2 million for 35,870 outstanding Oak Park River Forest options to participants who elected to receive a cash payment in lieu of converting the options to the Omnibus plan.

Earnings per Share

Earnings per Share	6 Months Ended
	Jun. 30, 2020
Earnings Per Share [Abstract]
Earnings per Share	Note 18—Earnings per Share A reconciliation of the numerators and denominators for earnings per common share computations is presented below. Incremental shares represent outstanding stock options for which the exercise price is less than the average market price of the Company’s common stock during the periods presented. Options to purchase 1,860,646 and 1,995,745 shares of common stock were outstanding as of June 30, 2020 and 2019, respectively. There were 448,857 and 288,560 restricted stock awards outstanding at June 30, 2020 and 2019, respectively. The following represent the calculation of basic and diluted earnings per share for the periods presented: Three Months Ended June 30, Six Months Ended June 30, 2020 2019 2020 2019 Net income $ 9,139 $ 13,211 $ 12,105 $ 25,808 Less: Dividends on preferred shares 195 195 391 391 Net income available to common stockholders $ 8,944 $ 13,016 $ 11,714 $ 25,417 Weighted-average common stock outstanding: Weighted-average common stock outstanding (basic) 37,919,480 37,263,352 37,931,406 36,719,436 Incremental shares 107,809 684,654 418,658 725,971 Weighted-average common stock outstanding (dilutive) 38,027,289 37,948,006 38,350,064 37,445,407 Basic earnings per common share $ 0.24 $ 0.35 $ 0.31 $ 0.69 Diluted earnings per common share $ 0.24 $ 0.34 $ 0.31 $ 0.68

Stockholders' Equity

Stockholders' Equity	6 Months Ended
	Jun. 30, 2020
Equity [Abstract]
Stockholders' Equity	Note 19—Stockholders’ Equity A summary of the Company’s preferred and common stock at June 30, 2020 and December 31, 2019 is as follows: June 30, December 31, 2020 2019 Series B 7.5% fixed to floating non-cumulative perpetual preferred stock Par value $ 0.01 $ 0.01 Shares authorized 50,000 50,000 Shares issued 10,438 10,438 Shares outstanding 10,438 10,438 Common stock, voting Par value $ 0.01 $ 0.01 Shares authorized 150,000,000 150,000,000 Shares issued 38,506,703 38,256,500 Shares outstanding 38,388,217 38,256,500 Treasury shares 118,486 — During 2016, the Company authorized and issued Series B 7.50% fixed-to-floating non-voting, noncumulative perpetual preferred stock with a liquidation preference of $1,000 per share, plus the amount of unpaid dividends, if any, which is redeemable at the Company’s option on or after March 31, 2022. Holders of Series B Preferred Stock do not have any rights to convert such stock into shares of any other class of capital stock of the Company. Holders of Series B Preferred Stock are entitled to receive a fixed dividend of 7.50% per annum from the original issue date through December 30, 2021, after which the dividend is paid at a floating rate of three-month LIBOR plus 5.41% per annum. The Company Series B Preferred Stock is included in Tier 1 capital for regulatory capital purposes and is redeemable at the option of the Company at a redemption price of $ 1,000 per share, plus any declared and unpaid dividends (i) in whole or part on any dividend payment date on or after March 31, 2022, and (ii) in whole but not in part prior to March 31, 2022, within 90 days following a regulatory event, as defined in the Certificate of Designations of the Company Series B Preferred Stock. The Company must receive approval of the Federal Reserve Board prior to any redemption of the Company Series B Preferred Stock. For the three months ended June 30, 2020 and 2019, the Company declared and paid dividends on the Series B preferred stock of $196,000. For the six months ended June 30, 2020 and 2019, the Company declared and paid dividends on the Series B preferred stock of $391,000. On November 1, 2019, the Company announced that its Board of Directors approved a stock repurchase program authorizing the purchase of up to an aggregate of 1,250,000 shares of the Company’s outstanding common stock. The shares may, at the discretion of management, be repurchased from time to time in open market purchases as market conditions warrant or in privately negotiated transactions. The Company is not obligated to purchase any shares under the program, and the program may be discontinued at any time. The actual timing, number and share price of shares purchased under the repurchase program will be determined by the Company at its discretion and will depend on a number of factors, including the market price of the Company’s stock, general market and economic conditions and applicable legal requirements. The shares authorized to be repurchased represent approximately 3.3% of the Company’s outstanding common stock at June 30, 2020. The program will be in effect until December 31, 2020 unless terminated earlier. The program was paused in March 2020. The Company repurchased 118,486 shares at a cost of $1.7 million under this program in the first quarter of 2020. Repurchased shares are recorded as treasury shares on the trade date using the treasury stock method, and the cash paid is recorded as treasury stock. Treasury stock acquired is recorded at cost and is carried as a reduction of stockholders’ equity in the Consolidated Statement of Financial Condition. On June 11, 2020, the Company’s Board of Directors declared a cash dividend of $0.03 per share payable on July 7, 2020 to stockholders of record of the Company’s common stock as of June 23, 2020. No cash dividends were declared to common stockholders during the second quarter of 2019.

Consolidated Statements of Ch_3

Consolidated Statements of Changes in Accumulated Other Comprehensive Income (Loss)	6 Months Ended
	Jun. 30, 2020
Accumulated Other Comprehensive Income Loss Net Of Tax [Abstract]
Consolidated Statements of Changes in Accumulated Other Comprehensive Income (Loss)	Note 20—Consolidated Statements of Changes in Accumulated Other Comprehensive Income (Loss) The following table summarizes the changes in accumulated other comprehensive income (loss) for the six months ended June 30, 2020 and 2019: (dollars in thousands) Unrealized Gains (Losses) on Cash Flow Hedges Unrealized (Losses) on Available-for -Sale Securities Total Accumulated Other Comprehensive Income (Loss) Balance, January 1, 2019 $ 4,763 $ (14,261 ) $ (9,498 ) Adoption of ASU 2016-01 — (1,440 ) (1,440 ) Other comprehensive income (loss), net of tax (4,699 ) 14,289 9,590 Balance, June 30, 2019 $ 64 $ (1,412 ) $ (1,348 ) Balance, January 1, 2020 $ (366 ) $ (334 ) $ (700 ) Other comprehensive income, net of tax 31 20,702 20,733 Balance, June 30, 2020 $ (335 ) $ 20,368 $ 20,033

Basis of Presentation (Policies

Basis of Presentation (Policies)	6 Months Ended
	Jun. 30, 2020
Accounting Policies [Abstract]
Basis of Presentation	These unaudited interim condensed consolidated financial statements include the accounts of Byline Illinois state chartered These unaudited interim condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) for interim financial information and in accordance with the instructions to Form 10-Q and Article 10 of Regulation S-X as promulgated by the Securities and Exchange Commission (“SEC”). In preparing these financial statements, the Company has evaluated events and transactions subsequent to June 30, 2020 for potential recognition or disclosure. In the opinion of management, all adjustments (consisting of normal recurring accruals) considered necessary for a fair presentation of the financial position and results of operations for the periods presented have been included. Certain information in footnote disclosures normally included in financial statements prepared in accordance with GAAP has been condensed or omitted pursuant to the rules and regulations of the SEC and the accounting standards for interim financial statements. These financial statements should be read in conjunction with the consolidated financial statements and notes thereto included in the Company’s Consolidated Financial Statements for the years ended December 31, 2019, 2018, and 2017. In accordance with the Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) Topic 855, “Subsequent Events,” the Company’s management has evaluated subsequent events for potential recognition or disclosure through the date of the issuance of these consolidated financial statements. The Company has one reportable segment. The Company’s chief operating decision maker evaluates the operations of the Company using consolidated information for purposes of allocating resources and assessing performance. Therefore, segments disclosures are not required. No subsequent events were identified that would have required a change to the consolidated financial statements or disclosure in the notes to the consolidated financial statements. Certain prior period amounts have been reclassified to conform to current period presentation. These reclassifications did not result in any changes to previously reported net income or stockholders’ equity.
Accounting Pronouncements Recently Adopted or Issued	The following reflect recent accounting pronouncements that have been adopted or are pending adoption by the Company. As the Company qualifies as an emerging growth company and has elected the extended transition period for complying with new or revised accounting pronouncements, it is not subject to new or revised accounting standards applicable to public companies during the extended transition period. The accounting pronouncements pending adoption below reflect effective dates for the Company as an emerging growth company with the extended transition period. Adopted Accounting Pronouncement Nonrefundable Fees and Other Costs (Subtopic 310‑20) —In March 2017, FASB issued ASU No. 2017‑08, . The amendments in the ASU shorten the amortization period for certain callable debt securities held at a premium at the earliest call date. Under current GAAP, the Company amortizes the premium as an adjustment of yield over the contractual life of the instrument. As a result, upon exercise of a call on a callable debt security held at a premium, the unamortized premium is charged to earnings. The ASU shortens the amortization period for certain callable debt securities held at a premium and requires the premium to be amortized to the earliest call date. However, the amendments do not require an accounting change for securities held at a discount; the discount continues to be amortized to maturity. The amendments are effective for fiscal years beginning after December 15, 2019, and interim periods within fiscal years beginning after December 15, 2020. The Company is required to apply the amendments on a modified retrospective basis through a cumulative-effect adjustment directly to retained earnings as of the beginning of the period of adoption. Given our emerging growth status, t he Company adopted these amendments on January 1, 2020 in conjunction with ASU No. 2017-08, which did not have a material impact on the Company’s Consolidated Financial Statements. Issued Accounting Pronouncements Pending Adoption Leases (Topic 842) —In February 2016, FASB issued ASU No. 2016‑02, . The amendments in this ASU require lessees to recognize the following for all leases (with the exception of short-term) at the commencement date: a lease liability, which is a lessee’s obligation to make lease payments arising from a lease, measured on a discounted basis; and a right-of-use asset, which is an asset that represents the lessee’s right to use, or control the use of, a specified asset for the lease term. The amendments in this ASU leave lessor accounting largely unchanged, although certain targeted improvements were made to align lessor accounting with the lessee accounting model. This ASU simplifies the accounting for sale and leaseback transactions primarily because lessees must recognize lease assets and lease liabilities. The amendments in this ASU are effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. Early application is permitted upon issuance. Lessees (for capital and operating leases) and lessors (for sales-type, direct financing, and operating leases) must apply a modified retrospective transition approach for leases existing at, or entered into after, the beginning of the earliest comparative period presented in the financial statements. The modified retrospective approach would not require any transition accounting for leases that expired before the earliest comparative period presented. Lessees and lessors may not apply a full retrospective transition approach. The Company is evaluating the new guidance and its impact on the Company’s Consolidated Statements of Operations and Consolidated Statements of Financial Condition. In November 2019, FASB issued ASU No. 2019-10, , which delays the effective date of this ASU for entities not classified as Public Business Entities (PBEs). Our status as an emerging growth company makes us eligible for this deferral. Assuming the Company remains an emerging growth company, the new authoritative guidance is effective for fiscal years beginning after December 15, 2020, and interim periods with fiscal years beginning after December 15, 2021. The Company expects an increase in assets and liabilities as a result of recognizing additional right-of-use assets and liabilities under lease contracts in which the Company is lessee. While the Company has not quantified the impact of this ASU on its direct financing lease portfolio, it does not expect a material change in its accounting for the initial direct costs related to these leases. Financial Instruments—Credit Losses (Topic 326) —In June 2016, FASB issued ASU No. 2016‑13, . Current GAAP requires an “incurred loss” methodology for recognizing credit losses that delays recognition until it is probable a loss has been incurred. The main objective of this ASU is to provide financial statement users with more decision-useful information about the expected credit losses on financial instruments and other commitments to extend credit held by a reporting entity at each reporting date. The amendments in this ASU replace the incurred loss impairment methodology in current GAAP with a methodology that reflects expected credit losses and requires consideration of a broader range of reasonable and supportable information to inform credit loss estimates. The amendments in this ASU require a financial asset (or group of financial assets) measured at amortized cost basis to be presented at the net amount expected to be collected. The allowance for credit losses is a valuation account that is deducted from the amortized cost basis of the financial asset(s) to present the net carrying value at the amount expected to be collected on the financial asset. The measurement of expected credit losses will be based on relevant information about past events, including historical experience, current conditions, and reasonable and supportable forecasts that affect the collectability of the reported amount. The amendments in this ASU broaden the information that an entity must consider in developing its expected credit loss estimate for assets measured either collectively or individually. The use of forecasted information incorporates more timely information in the estimate of expected credit loss, which will be more useful to users of the financial statements. In November 2019, FASB issued ASU No. 2019-10, , which delays the effective date of the ASU for entities not classified as PBEs. Assuming the Company remains an emerging growth company, the new authoritative guidance is effective for fiscal years beginning after December 15, 2022, including interim periods within those fiscal years. The Company is in the process of implementation and determining the impact that this ASU will have on the Company’s Consolidated Financial Statements. Income Taxes (Topic 740) —In December 2019, FASB issued ASU No. 2019-12, Simplifying the Accounting for Income Taxes . The amendments in the ASU simplify the accounting for income taxes by removing the following: the exception to the incremental approach for intraperiod tax allocation when there is a loss from continuing operations and income or a gain from other items; the exception to the requirement to or not to recognize a deferred tax liability for a foreign entity when it becomes an equity method investment or it becomes a subsidiary, respectively; and the exception to the general methodology for calculating income taxes in an interim period when a year-to-date loss exceeds the anticipated loss for the year. The amendments in the ASU changes current authoritative guidance by requiring the recognition of franchise tax that is partially based on income as an income-based tax and account for any incremental amount incurred as a non-income-based tax; requiring an evaluation when a step up in the tax basis of goodwill should be considered part the of business combination; specifying that it is not required to allocate the consolidated amount of current and deferred tax expense to a legal entity that is not subject to tax in its separate financial statements; and requiring that an entity reflect the effect of an enacted change in tax laws or rates in the annual effective tax rate computation in the interim period that includes the enactment date. The amendments are effective for annual periods beginning after December 15, 2021, and interim periods within annual periods beginning after December 15, 2022. Early adoption is permitted. Assuming the Company remains an emerging growth company, the new authoritative guidance will be effective for reporting periods after January 1, 2022. The Company is currently evaluating the provisions of ASU No. 2019-12 to determine the potential impact the new standard will have on the Company’s Consolidated Financial Statements. Reference Rate Reform (Topic 848) —In March 2020, FASB issued ASU No. 2020-04, . The amendments in the ASU provide optional guidance for a limited period of time to ease the potential burden in accounting for (or recognizing the effects of) reference rate reform on financial reporting. The amendments in the ASU provide optional expedients and exceptions for applying generally accepted accounting principles to contract modifications and hedging relationships, subject to meeting certain criteria, that reference LIBOR or another reference rate expected to be discontinued. The ASU is intended to help stakeholders during the global market-wide reference rate transition period. The amendments in the ASU will be in effect for all entities as of March 12, 2020 through December 31, 2022. The Company is currently evaluating the provisions of ASU No. 2020-04 to determine the potential impact the new standard will have on the Company’s Consolidated Financial Statements.

Acquisition (Tables)

Acquisition (Tables)	6 Months Ended
	Jun. 30, 2020
Business Combinations [Abstract]
Summary of Fair Values of Assets and Liabilities Assumed as of Acquisition Date	The following table presents a summary of the fair values of assets acquired and liabilities assumed as of the acquisition date: Assets Cash and cash equivalents $ 10,469 Securities available-for-sale 30,343 Restricted stock 414 Loans 257,423 Premises and equipment 3,488 Other real estate owned 2,201 Other intangible assets 6,220 Bank-owned life insurance 3,485 Deferred tax assets, net 5,925 Other assets 1,231 Total assets acquired 321,199 Liabilities Deposits 290,171 Line of credit 5,655 Federal Home Loan Bank advances 5,300 Accrued expenses and other liabilities 4,766 Total liabilities assumed 305,892 Net assets acquired $ 15,307 Consideration paid Common stock (1,464,558 shares issued at $20.02 per share) 29,320 Cash paid 6,163 Total consideration paid 35,483 Goodwill $ 20,176
Summary of Acquired Non-Impaired Loans as of Acquisition Date	The following table presents the acquired non-impaired loans as of the acquisition date: Fair value $ 204,496 Gross contractual amounts receivable 254,755 Estimate of contractual cash flows not expected to be collected (1) 12,987 Estimate of contractual cash flows expected to be collected 241,768 (1) Includes interest payments not expected to be collected due to loan prepayments as well as principal and interest payments not expected to be collected due to customer default.
Summary of Unaudited Pro Forma Information for Results of Operations	The following table provides the unaudited pro forma information for the results of operations for the three and six months ended June 30, 2019, as if the acquisitions had occurred on January 1, 2019. The pro forma results combine the historical results of Oak Park River Forest into the Company’s Consolidated Statements of Operations, including the impact of certain acquisition accounting adjustments, which includes loan discount accretion, intangible assets amortization, deposit premium accretion, and borrowings, net of discount amortization. The pro forma results have been prepared for comparative purposes only and are not necessarily indicative of the results that would have been obtained had the acquisition actually occurred on January 1, 2019. No assumptions have been applied to the pro forma results of operations regarding possible revenue enhancements, provision for credit losses, expense efficiencies or asset dispositions. The acquisition-related expenses that have been recognized are included in net income in the following table for the three and six months ended June 30, 2019. For the Three Months Ended For the Six Months Ended June 30, June 30, 2019 2019 Total revenues (net interest income and non-interest income) $ 68,003 $ 136,262 Net income $ 13,982 $ 27,572 Earnings per share—basic $ 0.35 $ 0.71 Earnings per share—diluted $ 0.34 $ 0.70

Securities (Tables)

Securities (Tables)	6 Months Ended
	Jun. 30, 2020
Investments Debt And Equity Securities [Abstract]
Summary of Amortized Cost and Fair Values of Securities Available-for-sale, and Held to Maturity	The following June 30, 2020 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value Available-for-sale U.S. Treasury Notes $ 30,443 $ 652 $ — $ 31,095 U.S. Government agencies 137,002 865 (72 ) 137,795 Obligations of states, municipalities, and political subdivisions 120,427 4,735 (6 ) 125,156 Residential mortgage-backed securities Agency 662,424 17,566 (125 ) 679,865 Non-agency 75,844 1,447 — 77,291 Commercial mortgage-backed securities Agency 232,137 7,028 (111 ) 239,054 Non-agency 30,984 237 — 31,221 Corporate securities 55,599 1,020 (341 ) 56,278 Asset-backed securities 50,431 — (1,315 ) 49,116 Total $ 1,395,291 $ 33,550 $ (1,970 ) $ 1,426,871 June 30, 2020 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value Held-to-maturity Obligations of states, municipalities, and political subdivisions $ 4,404 $ 178 $ — $ 4,582 Total $ 4,404 $ 178 $ — $ 4,582 December 31, 2019 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value Available-for-sale U.S. Treasury Notes $ 41,403 $ 427 $ — $ 41,830 U.S. Government agencies 165,162 542 (754 ) 164,950 Obligations of states, municipalities, and political subdivisions 92,806 2,075 (49 ) 94,832 Residential mortgage-backed securities Agency 490,427 2,163 (2,354 ) 490,236 Non-agency 109,501 593 (272 ) 109,822 Commercial mortgage-backed securities Agency 159,650 1,092 (1,041 ) 159,701 Non-agency 31,144 130 — 31,274 Corporate securities 48,796 571 (37 ) 49,330 Asset-backed securities 44,515 — (198 ) 44,317 Total $ 1,183,404 $ 7,593 $ (4,705 ) $ 1,186,292 December 31, 2019 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value Held-to-maturity Obligations of states, municipalities, and political subdivisions $ 4,412 $ 86 $ — $ 4,498 Total $ 4,412 $ 86 $ — $ 4,498
Summary of Gross Unrealized Losses and Fair Values, Aggregated by Investment Category and Length of Individual Securities Continuous Unrealized Loss Position Available-for-sale and Held to Maturity	Gross unrealized losses and fair values, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position as of June 30, 2020 and December 31, 2019, are summarized as follows: Less than 12 Months 12 Months or Longer Total June 30, 2020 # of Securities Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses Available-for-sale U.S. Government agencies 3 $ 27,051 $ (72 ) $ — $ — $ 27,051 $ (72 ) Obligations of states, municipalities and political subdivisions 3 415 (6 ) — — 415 (6 ) Residential mortgage-backed securities Agency 7 62,821 (119 ) 542 (6 ) 63,363 (125 ) Non-agency — — — — — — — Commercial mortgage-backed securities Agency 1 10,139 (111 ) — — 10,139 (111 ) Non-agency — — — — — — — Corporate securities 12 23,629 (341 ) — — 23,629 (341 ) Asset-backed securities 9 43,115 (1,315 ) — — 43,115 (1,315 ) Total 35 $ 167,170 $ (1,964 ) $ 542 $ (6 ) $ 167,712 $ (1,970 ) Less than 12 Months 12 Months or Longer Total December 31, 2019 # of Securities Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses Available-for-sale U.S. Government agencies 8 $ 49,318 $ (662 ) $ 20,283 $ (92 ) $ 69,601 $ (754 ) Obligations of states, municipalities and political subdivisions 7 13,309 (45 ) 1,419 (4 ) 14,728 (49 ) Residential mortgage-backed securities Agency 50 132,703 (666 ) 193,363 (1,688 ) 326,066 (2,354 ) Non-agency 9 36,902 (206 ) 10,126 (66 ) 47,028 (272 ) Commercial mortgage-backed securities Agency 13 67,649 (563 ) 32,678 (478 ) 100,327 (1,041 ) Corporate securities 4 6,103 (37 ) — — 6,103 (37 ) Asset-backed securities 8 37,738 (198 ) — — 37,738 (198 ) Total 99 $ 343,722 $ (2,377 ) $ 257,869 $ (2,328 ) $ 601,591 $ (4,705 )
Summary of Proceeds From Sales of Securities Available-for-sale and Associated Gains and Losses	The proceeds from all sales of securities three and six months ended June 30, 2020 For the Three Months Ended For the Six Months Ended June 30, June 30, 2020 2019 2020 2019 Proceeds $ — $ 59,594 $ 45,417 $ 59,594 Gross gains — 1,049 1,457 1,049 Gross losses — 76 82 76
Schedule of Amortized Cost and Fair Value of Debt Securities by Contractual Maturity	At June 30, 2020, the Amortized Cost Fair Value Available-for-sale Due in one year or less $ 30,114 $ 30,390 Due from one to five years 49,382 50,805 Due from five to ten years 175,499 178,405 Due after ten years 138,907 139,840 Mortgage-backed securities 1,001,389 1,027,431 Total $ 1,395,291 $ 1,426,871 Held-to-maturity Due in one year or less $ 504 $ 508 Due from one to five years 3,900 4,074 Total $ 4,404 $ 4,582

Loan and Lease Receivables (Tab

Loan and Lease Receivables (Tables)	6 Months Ended
	Jun. 30, 2020
Receivables [Abstract]
Schedule of Outstanding Loan and Lease Receivables	Outstanding loan and lease receivables as of the dates shown were categorized as follows: June 30, December 31, 2020 2019 Commercial real estate $ 1,349,297 $ 1,275,058 Residential real estate 670,257 711,499 Construction, land development, and other land 246,669 279,403 Commercial and industrial 1,309,523 1,330,418 Paycheck Protection Program ("PPP") 626,593 — Installment and other 3,684 6,484 Lease financing receivables 174,307 177,774 Total loans and leases 4,380,330 3,780,636 Net unamortized deferred fees and costs 8,271 2,289 Initial direct costs 2,521 2,736 Allowance for loan and lease losses (51,300 ) (31,936 ) Net loans and leases $ 4,339,822 $ 3,753,725 June 30, December 31, 2020 2019 Lease financing receivables Net minimum lease payments $ 188,826 $ 193,359 Unguaranteed residual values 1,575 1,347 Unearned income (16,094 ) (16,932 ) Total lease financing receivables 174,307 177,774 Initial direct costs 2,521 2,736 Lease financial receivables before allowance for lease losses $ 176,828 $ 180,510
Summary of Minimum Annual Lease Payments for Lease Financing Receivables	The minimum Minimum Lease Payments 2020 $ 36,115 2021 64,203 2022 46,052 2023 27,303 2024 12,721 Thereafter 2,432 Total $ 188,826
Summary of Balances for Each Respective Loan and Lease Category	The following June 30, 2020 Originated Acquired Impaired Acquired Non- Impaired Total Commercial real estate $ 919,510 $ 126,405 $ 305,041 $ 1,350,956 Residential real estate 480,692 90,784 99,288 670,764 Construction, land development, and other land 219,261 4,784 21,958 246,003 Commercial and industrial 1,200,996 13,485 116,668 1,331,149 Paycheck Protection Program 611,664 — — 611,664 Installment and other 2,714 226 818 3,758 Lease financing receivables 160,741 — 16,087 176,828 Total loans and leases $ 3,595,578 $ 235,684 $ 559,860 $ 4,391,122 December 31, 2019 Originated Acquired Impaired Acquired Non- Impaired Total Commercial real estate $ 792,263 $ 135,914 $ 348,365 $ 1,276,542 Residential real estate 483,072 100,223 128,527 711,822 Construction, land development, and other land 235,794 5,373 37,490 278,657 Commercial and industrial 1,160,996 16,909 153,660 1,331,565 Installment and other 5,372 249 944 6,565 Lease financing receivables 158,155 — 22,355 180,510 Total loans and leases $ 2,835,652 $ 258,668 $ 691,341 $ 3,785,661
Schedule of Estimated Fair Value of Impaired Loans Acquired at Acquisition	The following table presents a reconciliation of the undiscounted contractual cash flows, non-accretable difference, accretable yield, and fair value of acquired impaired loans as of the acquisition date of April 30, 2019: Undiscounted contractual cash flows $ 74,092 Undiscounted cash flows not expected to be collected (non-accretable difference) (11,401 ) Undiscounted cash flows expected to be collected 62,691 Accretable yield at acquisition (9,764 ) Estimated fair value of impaired loans acquired at acquisition $ 52,927
Summary of Outstanding Balance and Carrying Amount of All Acquired Impaired Loans	The outstanding June 30, 2020 December 31, 2019 Outstanding Balance Carrying Value Outstanding Balance Carrying Value Commercial real estate $ 134,224 $ 126,405 $ 189,969 $ 135,914 Residential real estate 95,706 90,784 151,641 100,223 Construction, land development, and other land 7,530 4,784 14,841 5,373 Commercial and industrial 17,716 13,485 23,330 16,909 Installment and other 284 226 1,099 249 Total acquired impaired loans $ 255,460 $ 235,684 $ 380,880 $ 258,668
Summary of Changes in Accretable Yield for Acquired Impaired Loans	The following table summarizes the changes in accretable yield for acquired impaired loans for the three and six months ended June 30, 2020 and 2019: Three Months Ended Six Months Ended June 30, June 30, 2020 2019 2020 2019 Beginning balance $ 37,037 $ 29,340 $ 40,009 $ 37,115 Additions — 8,501 — 8,501 Accretion to interest income (4,452 ) (5,996 ) (9,657 ) (11,245 ) Reclassification from (to) nonaccretable difference, net (717 ) 14,693 1,516 12,167 Ending balance $ 31,868 $ 46,538 $ 31,868 $ 46,538
Schedule of Unpaid Principal Balance and Carrying Value for Acquired Non-Impaired Loans and Leases	The unpaid June 30, 2020 December 31, 2019 Unpaid Principal Balance Carrying Value Unpaid Principal Balance Carrying Value Commercial real estate $ 312,284 $ 305,041 $ 356,787 $ 348,365 Residential real estate 100,571 99,288 130,412 128,527 Construction, land development, and other land 22,411 21,958 38,416 37,490 Commercial and industrial 120,626 116,668 159,599 153,660 Installment and other 840 818 971 944 Lease financing receivables 17,687 16,087 23,976 22,355 Total acquired non-impaired loans and leases $ 574,419 $ 559,860 $ 710,161 $ 691,341

Allowance for Loan and Lease _2

Allowance for Loan and Lease Losses and Reserve for Unfunded Commitments (Tables)	6 Months Ended
	Jun. 30, 2020
Receivables [Abstract]
Allowance for Loan and Lease Losses and Reserve for Unfunded Commitments	The following June 30, 2020 Commercial Real Estate Residential Real Estate Construction, Land Development, and Other Land Commercial and Industrial Paycheck Protection Program Installment and Other Lease Financing Receivables Total Allowance for loan and lease losses Three months ended Beginning balance $ 11,851 $ 2,778 $ 1,004 $ 24,139 $ — $ 53 $ 2,015 $ 41,840 Provisions 3,306 956 487 10,695 — (17 ) 91 15,518 Charge-offs (1,088 ) (4 ) — (4,845 ) — — (561 ) (6,498 ) Recoveries 41 11 — 119 — — 269 440 Ending balance $ 14,110 $ 3,741 $ 1,491 $ 30,108 $ — $ 36 $ 1,814 $ 51,300 Six months ended Beginning balance $ 7,965 $ 1,990 $ 610 $ 19,377 $ — $ 50 $ 1,944 $ 31,936 Provisions 7,728 1,740 881 19,241 — (14 ) 397 29,973 Charge-offs (1,640 ) (9 ) — (8,803 ) — — (1,018 ) (11,470 ) Recoveries 57 20 — 293 — — 491 861 Ending balance $ 14,110 $ 3,741 $ 1,491 $ 30,108 $ — $ 36 $ 1,814 $ 51,300 Ending balance: Individually evaluated for impairment $ 3,525 $ 80 $ — $ 10,409 $ — $ — $ — $ 14,014 Collectively evaluated for impairment 8,576 2,898 1,404 17,822 — 36 1,814 32,550 Loans acquired with deteriorated credit quality 2,009 763 87 1,877 — — — 4,736 Total allowance for loan and lease losses $ 14,110 $ 3,741 $ 1,491 $ 30,108 $ — $ 36 $ 1,814 $ 51,300 June 30, 2020 Commercial Real Estate Residential Real Estate Construction, Land Development, and Other Land Commercial and Industrial Paycheck Protection Program Installment and Other Lease Financing Receivables Total Loans and leases ending balance: Individually evaluated for impairment $ 36,751 $ 1,805 $ 4,189 $ 35,545 $ — $ — $ — $ 78,290 Collectively evaluated for impairment 1,187,800 578,175 237,030 1,282,119 611,664 3,532 176,828 4,077,148 Loans acquired with deteriorated credit quality 126,405 90,784 4,784 13,485 — 226 — 235,684 Total loans and leases $ 1,350,956 $ 670,764 $ 246,003 $ 1,331,149 $ 611,664 $ 3,758 $ 176,828 $ 4,391,122 June 30, 2019 Commercial Real Estate Residential Real Estate Construction, Land Development, and Other Land Commercial and Industrial Installment and Other Lease Financing Receivables Total Allowance for loan and lease losses Three months ended Beginning balance $ 6,660 $ 1,970 $ 536 $ 15,630 $ 63 $ 2,247 $ 27,106 Provisions 2,695 (62 ) 155 3,320 8 275 6,391 Charge-offs (818 ) (9 ) — (1,827 ) (4 ) (622 ) (3,280 ) Recoveries 397 272 — 3 — 243 915 Ending balance $ 8,934 $ 2,171 $ 691 $ 17,126 $ 67 $ 2,143 $ 31,132 Six months ended Beginning balance $ 7,540 $ 1,751 $ 466 $ 12,932 $ 49 $ 2,463 $ 25,201 Provisions 3,137 156 225 6,352 22 498 10,390 Charge-offs (2,169 ) (9 ) — (2,179 ) (4 ) (1,267 ) (5,628 ) Recoveries 426 273 — 21 — 449 1,169 Ending balance $ 8,934 $ 2,171 $ 691 $ 17,126 $ 67 $ 2,143 $ 31,132 Ending balance: Individually evaluated for impairment $ 2,775 $ 22 $ — $ 6,489 $ — $ — $ 9,286 Collectively evaluated for impairment 4,433 1,559 676 9,495 65 2,143 18,371 Loans acquired with deteriorated credit quality 1,726 590 15 1,142 2 — 3,475 Total allowance for loan and lease losses $ 8,934 $ 2,171 $ 691 $ 17,126 $ 67 $ 2,143 $ 31,132 June 30, 2019 Commercial Real Estate Residential Real Estate Construction, Land Development, and Other Land Commercial and Industrial Installment and Other Lease Financing Receivables Total Loans and leases ending balance: Individually evaluated for impairment $ 18,707 $ 2,899 $ — $ 24,278 $ — $ — $ 45,884 Collectively evaluated for impairment 1,141,705 656,329 247,728 1,275,922 12,609 188,420 3,522,713 Loans acquired with deteriorated credit quality 151,127 118,534 4,220 20,370 300 — 294,551 Total loans and leases $ 1,311,539 $ 777,762 $ 251,948 $ 1,320,570 $ 12,909 $ 188,420 $ 3,863,148
Summary of Recorded Investment, Unpaid Principal Balance, and Related Allowance for Loans and Leases Considered Impaired	The following and June 30, 2020 Recorded Investment Unpaid Principal Balance Related Allowance With no related allowance recorded Commercial real estate $ 24,950 $ 91,211 $ — Residential real estate 1,534 1,624 — Construction, land development, and other land 4,189 4,216 — Commercial and industrial 16,774 43,215 — With an allowance recorded Commercial real estate 11,801 47,249 3,525 Residential real estate 271 274 80 Commercial and industrial 18,771 59,869 10,409 Total impaired loans $ 78,290 $ 247,658 $ 14,014 December 31, 2019 Recorded Investment Unpaid Principal Balance Related Allowance With no related allowance recorded Commercial real estate $ 16,556 $ 19,808 $ — Residential real estate 2,165 2,253 — Construction, land development, and other land 2,644 3,000 — Commercial and industrial 19,211 20,398 — With an allowance recorded Commercial real estate 9,840 10,691 2,614 Residential real estate 233 233 124 Commercial and industrial 18,092 19,285 7,952 Total impaired loans $ 68,741 $ 75,668 $ 10,690
Summary of Average Recorded Investment and Interest Income Recognized for Loans and Leases Considered Impaired	The following tables summarize the average recorded investment and interest income recognized for loans and leases considered impaired, which excludes acquired impaired loans, for the six months ended: June 30, 2020 Average Recorded Investment Interest Income Recognized With no related allowance recorded Commercial real estate $ 20,544 $ 555 Residential real estate 1,398 15 Construction, land development, and other land 3,094 220 Commercial and industrial 16,651 262 With an allowance recorded Commercial real estate 13,402 339 Residential real estate 512 21 Commercial and industrial 22,948 746 Total impaired loans $ 78,549 $ 2,158 June 30, 2019 Average Recorded Investment Interest Income Recognized With no related allowance recorded Commercial real estate $ 8,094 $ 187 Residential real estate 1,785 27 Commercial and industrial 11,583 223 With an allowance recorded Commercial real estate 6,793 155 Residential real estate 219 4 Commercial and industrial 12,043 247 Total impaired loans $ 40,517 $ 843
Summary of Risk Rating Categories of Loans and Leases Considered for Inclusion in Allowance for Loan and Lease Losses Calculation	The following June 30, 2020 Commercial Real Estate Residential Real Estate Construction, Land Development, and Other Land Commercial and Industrial Paycheck Protection Program Installment and Other Lease Financing Receivables Total Pass $ 1,012,490 $ 551,885 $ 232,121 $ 1,053,606 $ 611,664 $ 3,257 $ 172,443 $ 3,637,466 Watch 139,224 20,614 3,472 175,207 — 273 — 338,790 Special Mention 37,306 3,731 1,437 52,739 — — 2,242 97,455 Substandard 35,531 3,750 4,189 36,112 — 2 1,574 81,158 Doubtful — — — — — — 569 569 Loss — — — — — — — — Total $ 1,224,551 $ 579,980 $ 241,219 $ 1,317,664 $ 611,664 $ 3,532 $ 176,828 $ 4,155,438 December 31, 2019 Commercial Real Estate Residential Real Estate Construction, Land Development, and Other Land Commercial and Industrial Installment and Other Lease Financing Receivables Total Pass $ 984,881 $ 584,363 $ 247,775 $ 1,087,856 $ 6,013 $ 177,696 $ 3,088,584 Watch 99,803 21,856 18,181 159,282 302 8 299,432 Special Mention 27,484 3,648 4,684 26,944 — 1,799 64,559 Substandard 28,460 1,732 2,644 40,574 1 728 74,139 Doubtful — — — — — 279 279 Loss — — — — — — — Total $ 1,140,628 $ 611,599 $ 273,284 $ 1,314,656 $ 6,316 $ 180,510 $ 3,526,993
Summary of Contractual Delinquency Information	The following tables summarize contractual delinquency information for acquired non-impaired and originated loans and leases by category at June 30, 2020 and December 31, 2019: June 30, 2020 30-59 Days Past Due 60-89 Days Past Due Greater than 90 Days and Accruing Non- accrual Total Past Due Current Total Commercial real estate $ 2,864 $ 2,150 $ — $ 17,963 $ 22,977 $ 1,201,574 $ 1,224,551 Residential real estate 2,302 349 — 1,780 4,431 575,549 579,980 Construction, land development, and other land — — — — — 241,219 241,219 Commercial and industrial 3,298 360 — 19,100 22,758 1,294,906 1,317,664 Paycheck Protection Program — — — — — 611,664 611,664 Installment and other 4 36 — 2 42 3,490 3,532 Lease financing receivables 912 396 — 1,660 2,968 173,860 176,828 Total $ 9,380 $ 3,291 $ — $ 40,505 $ 53,176 $ 4,102,262 $ 4,155,438 December 31, 2019 30-59 Days Past Due 60-89 Days Past Due Greater than 90 Days and Accruing Non- accrual Total Past Due Current Total Commercial real estate $ 14,269 $ 5,153 $ — $ 12,274 $ 31,696 $ 1,108,932 $ 1,140,628 Residential real estate 3,187 460 — 1,371 5,018 606,581 611,599 Construction, land development, and other land — 4,460 — — 4,460 268,824 273,284 Commercial and industrial 7,789 3,594 — 22,151 33,534 1,281,122 1,314,656 Installment and other 133 2 — 1 136 6,180 6,316 Lease financing receivables 585 532 — 475 1,592 178,918 180,510 Total $ 25,963 $ 14,201 $ — $ 36,272 $ 76,436 $ 3,450,557 $ 3,526,993
Summary of TDR's by Loan Category	The tables below present TDRs by loan category as of June 30, 2020 and December 31, 2019: June 30, 2020 Number of Loans Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Charge-offs Specific Reserves Accruing: Commercial real estate 7 $ 2,856 $ 2,856 $ — $ 98 Commercial and industrial 2 123 123 — 101 Residential real estate 2 172 172 — — Total accruing 11 3,151 3,151 — 199 Non-accruing: Commercial real estate 6 2,840 1,911 929 55 Commercial and industrial 13 5,524 5,447 77 3,757 Residential real estate 1 91 91 — — Total non-accruing 20 8,455 7,449 1,006 3,812 Total troubled debt restructurings 31 $ 11,606 $ 10,600 $ 1,006 $ 4,011 December 31, 2019 Number of Loans Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Charge-offs Specific Reserves Accruing: Commercial real estate 5 $ 1,451 $ 1,451 $ — $ 223 Commercial and industrial 2 129 129 — 118 Residential real estate 2 191 191 — — Total accruing 9 1,771 1,771 — 341 Non-accruing: Commercial real estate 6 2,777 2,600 177 513 Commercial and industrial 11 8,048 6,096 1,952 1,312 Residential real estate 1 104 104 — — Total non-accruing 18 10,929 8,800 2,129 1,825 Total troubled debt restructurings 27 $ 12,700 $ 10,571 $ 2,129 $ 2,166
Summary of Loans Modified as Troubled Debt Restructurings	Loans modified and 2019 were: Three Months Ended Six Months Ended June 30, June 30, 2020 2019 2020 2019 Accruing: Beginning balance $ 1,725 $ 1,921 $ 1,771 $ 1,813 Additions — — — 113 Net payments (30 ) (44 ) (76 ) (49 ) Net transfers from (to) non-accrual 1,456 (348 ) 1,456 (348 ) Ending balance 3,151 1,529 3,151 1,529 Non-accruing: Beginning balance 12,117 7,119 8,800 7,314 Additions 1,375 1,182 5,633 1,428 Net payments (445 ) (815 ) (1,386 ) (726 ) Charge-offs (4,142 ) — (4,142 ) (530 ) Net transfers from (to) accrual (1,456 ) 348 (1,456 ) 348 Ending balance 7,449 7,834 7,449 7,834 Total troubled debt restructurings $ 10,600 $ 9,363 $ 10,600 $ 9,363

Servicing Assets (Tables)

Servicing Assets (Tables)	6 Months Ended
	Jun. 30, 2020
Transfers And Servicing [Abstract]
Activity for Servicing Assets and Related Changes in Fair Value	Activity for the three and six months ended June 30, 2020 and 2019 was Three Months Ended June 30, Six Months Ended June 30, 2020 2019 2020 2019 Beginning balance $ 17,800 $ 19,534 $ 19,471 $ 19,693 Additions, net 1,262 1,449 2,655 2,551 Changes in fair value (711 ) (1,223 ) (3,775 ) (2,484 ) Ending balance $ 18,351 $ 19,760 $ 18,351 $ 19,760
Unpaid Principal Balances of Loans Serviced for Others	The unpaid as of and were as follows: June 30, December 31, 2020 2019 Loan portfolios serviced for: SBA guaranteed loans $ 1,278,876 $ 1,231,959 USDA guaranteed loans 123,450 119,047 Total $ 1,402,326 $ 1,351,006

Other Real Estate Owned (Tables

Other Real Estate Owned (Tables)	6 Months Ended
	Jun. 30, 2020
Banking And Thrift [Abstract]
Change in Other Real Estate Owned	The following table presents the change in other real estate owned (“OREO”) for the three and six months ended June 30, 2020 Three Months Ended June 30, Six Months Ended June 30, 2020 2019 2020 2019 Beginning balance $ 9,273 $ 4,595 $ 9,896 $ 5,041 Acquisitions of OREO through business combination — 2,201 — 2,201 Net additions to OREO 64 510 86 536 Proceeds from sales of OREO (386 ) (702 ) (650 ) (1,057 ) Gains (losses) on sales of OREO 3 6 85 (27 ) Valuation adjustments (302 ) (79 ) (765 ) (163 ) Ending balance $ 8,652 $ 6,531 $ 8,652 $ 6,531

Goodwill, Core Deposit Intang_2

Goodwill, Core Deposit Intangible and Other Intangible Assets (Tables)	6 Months Ended
	Jun. 30, 2020
Goodwill And Intangible Assets Disclosure [Abstract]
Summary of Changes in Goodwill, Core Deposit Intangible Assets and Customer Relationship Intangible Assets	The following tables summarize the changes in the Company’s goodwill, core deposit intangible assets, and customer relationship intangible assets for the three and six months ended June 30, 2020 and 2019: Three Months Ended June 30, 2020 2019 Goodwill Core Intangible Customer Relationship Intangible Goodwill Core Intangible Customer Relationship Intangible Beginning balance $ 148,353 $ 27,285 $ 2,724 $ 128,177 $ 28,654 $ 2,992 Additions — — — 17,461 6,220 — Amortization — (1,826 ) (66 ) — (1,892 ) (66 ) Ending balance $ 148,353 $ 25,459 $ 2,658 $ 145,638 $ 32,982 $ 2,926 Accumulated amortization N/A $ 30,007 $ 558 N/A $ 22,484 $ 290 Weighted average remaining amortization period N/A 6.0 Years 9.9 Years N/A 7.0 Years 10.9 Years
Estimated Amortization Expense for Core Deposit Intangible and Customer Relationship Intangible Recognized	The following table presents the estimated amortization expense for core deposit intangible and customer relationship intangible assets remaining at June 30, 2020: Estimated Amortization 2020 $ 3,785 2021 6,998 2022 6,426 2023 4,371 2024 2,286 Thereafter 4,251 Total $ 28,117

Deposits (Tables)

Deposits (Tables)	6 Months Ended
	Jun. 30, 2020
Deposits [Abstract]
Composition of Deposits	The composition of deposits was as follows as of June 30, 2020 and December 31, 2019: June 30, December 31, 2020 2019 Non-interest-bearing demand deposits $ 1,768,675 $ 1,279,641 Interest-bearing checking accounts 503,909 338,185 Money market demand accounts 1,233,748 881,387 Other savings 525,043 475,839 Time deposits (below $250,000) 710,429 916,723 Time deposits ($250,000 and above) 216,541 255,802 Total deposits $ 4,958,345 $ 4,147,577

Other Borrowings (Tables)

Other Borrowings (Tables)	6 Months Ended
	Jun. 30, 2020
Debt Disclosure [Abstract]
Summary of Other Borrowings	The following is a summary of the Company’s other borrowings as of June 30, 2020 and December 31, 2019: June 30, December 31, 2020 2019 Paycheck Protection Program Liquidity Facility $ 449,889 $ — Line of credit — — Federal Home Loan Bank advances 4,000 490,000 Securities sold under agreements to repurchase 56,525 49,638 Total $ 510,414 $ 539,638
Summary of Short-term Credit Lines Available for Use	The following June 30, December 31, 2020 2019 Available federal funds lines (1) $ 115,000 $ 115,000 Federal Reserve Bank discount window line 884,968 547,798 Federal Home Loan Bank line 1,980,351 1,390,698 (1) The June 30, 2020

Subordinated Notes and Junior_2

Subordinated Notes and Junior Subordinated Debentures (Tables)	6 Months Ended
	Jun. 30, 2020
Debt Disclosure [Abstract]
Junior Subordinated Debentures by Issuance	At June 30, 2020 and December 31, 2019, the Name of Trust Aggregate Principal Amount June 30, 2020 Aggregate Principal Amount December 31, 2019 Stated Maturity Contractual Rate at June 30, 2020 Interest Rate Spread Metropolitan $ 35,000 $ 35,000 March 3.09 % Three-month LIBOR + 2.79% RidgeStone Capital Trust I — 1,500 June 30, 2033 n/a Five-year LIBOR + 3.50% First Evanston Bancorp Trust I 10,000 10,000 March 15, 2035 2.09 % Three-month LIBOR + 1.78% Total liability, at par 45,000 46,500 Discount (8,794 ) (9,166 ) Total liability, at carrying value $ 36,206 $ 37,334

Commitments and Contingent Li_2

Commitments and Contingent Liabilities (Tables)	6 Months Ended
	Jun. 30, 2020
Commitments And Contingencies Disclosure [Abstract]
Summary of Minimum Annual Rental Commitments for Operating Leases	The minimum Minimum Commitments 2020 $ 2,258 2021 4,148 2022 2,380 2023 1,382 2024 1,249 Thereafter 2,148 Total $ 13,565
Summary of Contract or Notional Amount of Outstanding Loan and Lease Commitments	The following June 30, 2020 December 31, 2019 Fixed Rate Variable Total Fixed Variable Total Commitments to extend credit $ 81,722 $ 962,873 $ 1,044,595 $ 55,852 $ 908,382 $ 964,234 Letters of credit 692 62,207 62,899 724 65,514 66,238 Total $ 82,414 $ 1,025,080 $ 1,107,494 $ 56,576 $ 973,896 $ 1,030,472

Fair Value Measurement (Tables)

Fair Value Measurement (Tables)	6 Months Ended
	Jun. 30, 2020
Fair Value Disclosures [Abstract]
Summary of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis	The following Fair Value Measurements Using June 30, 2020 Fair Value Level 1 Level 2 Level 3 Financial assets Securities available-for-sale U.S. Treasury Notes $ 31,095 $ 31,095 $ — $ — U.S. Government agencies 137,795 — 137,795 — Obligations of states, municipalities, and political subdivisions 125,156 — 125,156 — Mortgage-backed securities; residential Agency 679,865 — 679,865 — Non-Agency 77,291 — 77,291 — Mortgage-backed securities; commercial Agency 239,054 — 239,054 — Non-Agency 31,221 — 31,221 — Corporate securities 56,278 — 56,278 — Asset-backed securities 49,116 — 49,116 — Equity and other securities, at fair value Mutual funds 2,996 2,996 — — Equity securities 5,185 — 4,501 684 Servicing assets 18,351 — — 18,351 Derivative assets 20,084 — 20,084 — Financial liabilities Derivative liabilities 21,393 — 21,393 — Fair Value Measurements Using December 31, 2019 Fair Value Level 1 Level 2 Level 3 Financial assets Securities available-for-sale U.S. Treasury Notes $ 41,830 $ 41,830 $ — $ — U.S. Government agencies 164,950 — 164,950 — Obligations of states, municipalities, and political subdivisions 94,832 — 94,832 — Mortgage-backed securities; residential Agency 490,236 — 490,236 — Non-Agency 109,822 — 109,822 — Mortgage-backed securities; commercial Agency 159,701 — 159,701 — Non-Agency 31,274 — 31,274 — Corporate securities 49,330 — 49,330 — Asset-backed securities 44,317 — 44,317 — Equity and other securities, at fair value Mutual funds 2,952 2,952 — — Equity securities 5,079 — 4,379 700 Servicing assets 19,471 — — 19,471 Derivative assets 7,960 — 7,960 — Financial liabilities Derivative liabilities 8,519 — 8,519 —
Summary of Financial Assets Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs	The following table presents additional information about financial assets measured at fair value on recurring basis for which the Company used significant unobservable inputs (Level 3): Six Months Ended June 30, 2020 2019 2020 2019 Investment Securities Servicing Assets Balance, beginning of period $ 700 $ 886 $ 19,471 $ 19,693 Additions, net — — 2,655 2,551 Amortization — 3 — — Change in fair value (19 ) 1 (3,775 ) (2,484 ) Balance, end of period $ 681 $ 890 $ 18,351 $ 19,760
Summary of Unobservable Inputs Used in the Fair Value Measurements on Recurring Basis	The following Financial Instruments Valuation Technique Unobservable Inputs Range of Inputs Weighted Average Range Impact to Valuation from an Increased or Higher Input Value Single issuer trust preferred Discounted cash flow Discount rate 4.9% - 5.4% 5.5 % Decrease Servicing assets Discounted cash flow Prepayment speeds 1.7% - 29.2% 16.0 % Decrease Discount rate 2.1% - 37.6% 11.5 % Decrease Expected weighted average loan life 0.1 - 8.8 years 3.7 years Increase
Summary of Assets Measured at Fair Value on Non-Recurring Basis, Excluding Acquired Impaired Loans	The following tables Fair Value Measurements Using June 30, 2020 Fair Value Level 1 Level 2 Level 3 Non-recurring Impaired loans (excluding acquired impaired loans) Commercial real estate $ 33,226 $ — $ — $ 33,226 Residential real estate 1,725 — — 1,725 Construction, land development, and other land 4,189 — — 4,189 Commercial and industrial 25,136 — — 25,136 Assets held for sale 15,264 — — 15,264 Other real estate owned 8,652 — — 8,652 Fair Value Measurements Using December 31, 2019 Fair Value Level 1 Level 2 Level 3 Non-recurring Impaired loans (excluding acquired impaired loans) Commercial real estate $ 23,782 $ — $ — $ 23,782 Residential real estate 2,274 — — 2,274 Construction, land development, and other land 2,644 — — 2,644 Commercial and industrial 29,351 — — 29,351 Assets held for sale 15,362 — — 15,362 Other real estate owned 9,896 — — 9,896
Summary of Estimated Fair Values of Financial Instruments	The estimated not carried at fair value June 30, December 31, Fair Value 2020 2019 Hierarchy Level Carrying Amount Estimated Fair Value Carrying Amount Estimated Fair Value Financial assets Cash and due from banks 1 $ 51,818 $ 51,818 $ 48,228 $ 48,228 Interest bearing deposits with other banks 2 88,113 88,113 32,509 32,509 Securities held-to-maturity 2 4,404 4,582 4,412 4,498 Other restricted stock 2 6,232 6,232 22,127 22,127 Loans held for sale 3 3,031 3,357 11,732 12,935 Loans and lease receivables, net (less impaired loans at fair value 3 4,275,546 4,211,233 3,695,674 3,661,724 Accrued interest receivable 3 15,633 15,633 13,283 13,283 Financial liabilities Non-interest-bearing deposits 2 1,768,675 1,768,675 1,279,641 1,279,641 Interest-bearing deposits 2 3,189,670 3,193,090 2,867,936 2,873,380 Accrued interest payable 2 1,928 1,928 3,677 3,677 Paycheck Protection Program Liquidity Facility 2 449,889 449,889 — — Federal Home Loan Bank advances 2 4,000 4,000 490,000 490,000 Securities sold under repurchase agreement 2 56,525 56,525 49,638 49,638 Subordinated notes 2 50,000 49,999 — — Junior subordinated debentures 3 36,206 40,310 37,334 42,881

Derivative Instruments and He_2

Derivative Instruments and Hedge Activities (Tables)	6 Months Ended
	Jun. 30, 2020
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Summary of Derivative Financial Instruments and Classification on Consolidated Statements of Financial Condition	The following tables present the fair value of the Company’s derivative financial instruments and classification on the Consolidated Statements of Financial Condition as of June 30, 2020 and December 31, 2019: June 30, 2020 December 31, 2019 Fair Value Fair Value Notional Amount Other Assets Other Liabilities Notional Amount Other Assets Other Liabilities Derivatives not designated as hedging instruments Other interest rate derivatives 373,862 20,084 21,370 332,056 7,960 8,507 Other credit derivatives 8,870 — 23 9,302 — 12 Total derivatives $ 382,732 $ 20,084 $ 21,393 $ 341,358 $ 7,960 $ 8,519
Summary of Net Gains (Losses) Recorded in Accumulated Other Comprehensive Income (Loss) and Consolidated Statements of Operations Relating to Cash Flow Derivative Instruments	The following table reflects the net gains (losses) recorded in accumulated other comprehensive income (loss) and the Consolidated Statements of Operations relating to the cash flow derivative instruments for the six months ended: June 30, 2020 June 30, 2019 Amount of Loss Recognized in OCI Amount of Loss Reclassified from OCI to Income as an Increase to Interest Expense Amount of Gain (Loss) Recognized in Other Non-Interest Income Amount of Loss Recognized in OCI Amount of Gain Reclassified from OCI to Income as a Decrease to Interest Expense Amount of Gain (Loss) Recognized in Other Non-Interest Income Interest rate swaps $ — $ (42 ) $ — $ (5,234 ) $ 1,280 $ —
Summary of Other Interest Rate Derivatives	The following table reflects other interest rate derivatives as of June 30, 2020: Notional amounts $ 373,862 Derivative assets fair value 20,084 Derivative liabilities fair value 21,370 Weighted average pay rates 4.49 % Weighted average receive rates 2.68 % Weighted average maturity 6.4 years
Summary of Amounts Included in Non-Interest Income in Consolidated Statements of Operations Relating to Derivative Instruments not Designated in Hedging Relationship	The following table reflects amounts included in non-interest income in the Consolidated Statements of Operations relating to derivative instruments that are not designated in a hedging relationship for the three and six months ended June 30, 2020 and 2019: Three Months Ended Six Months Ended June 30, June 30, 2020 2019 2020 2019 Other interest rate derivatives $ (17 ) $ (221 ) $ (740 ) $ (372 ) Other credit derivatives 1 (3 ) (11 ) (4 ) Total $ (16 ) $ (224 ) $ (751 ) $ (376 )
Summary of Company's Interest Rate Derivative and Offsetting Positions	The Company records interest rate derivatives subject to master netting agreements at their gross value and does not offset derivative asset and liabilities on the Consolidated Statements of Financial Condition. The table below summarizes the Company’s interest rate derivatives and offsetting positions as of: June 30, 2020 December 31, 2019 Derivative Assets Fair Value Derivative Liabilities Fair Value Derivative Assets Fair Value Derivative Liabilities Fair Value Gross amounts recognized $ 20,084 $ 21,393 $ 7,960 $ 8,519 Less: Amounts offset in the Consolidated Statements of Financial Condition — — — — Net amount presented in the Consolidated Statements of Financial Condition $ 20,084 $ 21,393 $ 7,960 $ 8,519 Gross amounts not offset in the Consolidated Statements of Financial Condition Offsetting derivative positions — — (1 ) (1 ) Collateral posted (20,084 ) (21,261 ) (7,959 ) (8,518 ) Net credit exposure $ — $ 132 $ — $ —

Share-Based Compensation (Table

Share-Based Compensation (Tables)	6 Months Ended
	Jun. 30, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Summary of Stock Compensation Expense	The following table summarizes stock option compensation expense for the six months ended June 30, 2020 and 2019 : Six Months Ended June 30, 2020 2019 Total share-based compensation (benefit) - stock options $ 7 $ (133 ) Income tax benefit (expense) 2 (37 ) Unrecognized compensation expense - stock options — 35 Weighted-average amortization period remaining 0.0 years 0.7 years
Restricted Shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Summary of Stock Compensation Expense	The following table summarizes restricted stock compensation expense for the six months ended June 30, 2020 and 2019: Six Months Ended June 30, 2020 2019 Total share-based compensation - restricted stock $ 1,336 $ 807 Income tax benefit 372 225 Unrecognized compensation expense 6,329 4,829 Weighted-average amortization period remaining 2.7 years 3.0 years
Omnibus Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Summary of Changes in Restricted Shares	The following table discloses the changes in restricted shares for the six months ended June 30, 2020: Omnibus Plan Number of Shares Weighted Average Grant Date Fair Value Beginning balance, January 1, 2020 328,653 $ 19.94 Granted 174,179 17.52 Vested (53,832 ) 20.76 Forfeited (143 ) 17.50 Ending balance outstanding at June 30, 2020 448,857 $ 18.90
BYB Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Summary of Activity in shares Subjected to Options and Weighted Average Exercise Prices	The following table discloses the activity in shares subject to options and the weighted average exercise prices, in actual dollars, for the six months ended June 30, 2020: BYB Plan Number of Shares Weighted Average Exercise Price Intrinsic Value Weighted Average Remaining Contractual Term (in Years) Beginning balance, January 1, 2020 1,410,075 $ 11.38 $ 11,542 5.4 Exercised (19,496 ) 13.00 $ 139 Expired — Ending balance outstanding at June 30, 2020 1,390,579 $ 11.36 $ 2,574 4.9 Exercisable at June 30, 2020 1,390,579 $ 11.36 $ 2,574 4.9
FEB Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Summary of Activity in shares Subjected to Options and Weighted Average Exercise Prices	The following table discloses the activity in shares subject to options under the FEB Plan and the weighted average exercise prices, in actual dollars, for the six months ended June 30, 2020: FEB Plan Number of Shares Weighted Average Exercise Price Intrinsic Value Weighted Average Remaining Contractual Term (in Years) Beginning balance, January 1, 2020 511,169 $ 11.35 $ 4,204 4.4 Exercised (41,102 ) $ 11.65 $ 313 Expired — Ending balance outstanding at June 30, 2020 470,067 $ 11.32 $ 837 3.8 Exercisable at June 30, 2020 470,067 $ 11.32 $ 837 3.8

Earnings per Share (Tables)

Earnings per Share (Tables)	6 Months Ended
	Jun. 30, 2020
Earnings Per Share [Abstract]
Schedule of Calculation of Basic and Diluted Earnings per Share	The following represent the calculation of basic and diluted earnings per share for the periods presented: Three Months Ended June 30, Six Months Ended June 30, 2020 2019 2020 2019 Net income $ 9,139 $ 13,211 $ 12,105 $ 25,808 Less: Dividends on preferred shares 195 195 391 391 Net income available to common stockholders $ 8,944 $ 13,016 $ 11,714 $ 25,417 Weighted-average common stock outstanding: Weighted-average common stock outstanding (basic) 37,919,480 37,263,352 37,931,406 36,719,436 Incremental shares 107,809 684,654 418,658 725,971 Weighted-average common stock outstanding (dilutive) 38,027,289 37,948,006 38,350,064 37,445,407 Basic earnings per common share $ 0.24 $ 0.35 $ 0.31 $ 0.69 Diluted earnings per common share $ 0.24 $ 0.34 $ 0.31 $ 0.68

Stockholders' Equity (Tables)

Stockholders' Equity (Tables)	6 Months Ended
	Jun. 30, 2020
Equity [Abstract]
Summary of Preferred and Common Stock	A summary of the Company’s preferred and common stock at June 30, 2020 and December 31, 2019 is as follows: June 30, December 31, 2020 2019 Series B 7.5% fixed to floating non-cumulative perpetual preferred stock Par value $ 0.01 $ 0.01 Shares authorized 50,000 50,000 Shares issued 10,438 10,438 Shares outstanding 10,438 10,438 Common stock, voting Par value $ 0.01 $ 0.01 Shares authorized 150,000,000 150,000,000 Shares issued 38,506,703 38,256,500 Shares outstanding 38,388,217 38,256,500 Treasury shares 118,486 —

Consolidated Statements of Ch_4

Consolidated Statements of Changes in Accumulated Other Comprehensive Income (Loss) (Tables)	6 Months Ended
	Jun. 30, 2020
Accumulated Other Comprehensive Income Loss Net Of Tax [Abstract]
Schedule of Consolidated Statements of Changes in Accumulated Other Comprehensive Income (Loss)	The following table summarizes the changes in accumulated other comprehensive income (loss) for the six months ended June 30, 2020 and 2019: (dollars in thousands) Unrealized Gains (Losses) on Cash Flow Hedges Unrealized (Losses) on Available-for -Sale Securities Total Accumulated Other Comprehensive Income (Loss) Balance, January 1, 2019 $ 4,763 $ (14,261 ) $ (9,498 ) Adoption of ASU 2016-01 — (1,440 ) (1,440 ) Other comprehensive income (loss), net of tax (4,699 ) 14,289 9,590 Balance, June 30, 2019 $ 64 $ (1,412 ) $ (1,348 ) Balance, January 1, 2020 $ (366 ) $ (334 ) $ (700 ) Other comprehensive income, net of tax 31 20,702 20,733 Balance, June 30, 2020 $ (335 ) $ 20,368 $ 20,033

Basis of Presentation - Additio

Basis of Presentation - Additional Information (Details)	6 Months Ended
	Jun. 30, 2020segment
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Number of reportable segments	1

Acquisition - Additional Inform

Acquisition - Additional Information (Details) - USD ($)	May 15, 2019	Apr. 30, 2019	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2018
Business Acquisition [Line Items]
Goodwill			$ 145,638,000	$ 148,353,000	$ 145,638,000	$ 148,353,000	$ 148,353,000	$ 128,177,000	$ 128,177,000
Oak Park River Forest Bankshares, Inc.
Business Acquisition [Line Items]
Business acquisition date of agreement				Apr. 30, 2019
Right to receive common stock upon conversion		7.9321
Consideration paid in cash	$ 4,200,000	$ 6,163,000
Common stock outstanding value per share		$ 33.375
Common stock issued price per share		$ 20.02
Issuance of common shares		1,464,558
Value of common stock consideration		$ 29,300,000
Options to acquire common stock shares		35,870
Option to acquire common stock value		$ 4,200,000
Total merger consideration		35,483,000
Stock issuance costs		585,000
Goodwill		$ 20,176,000
Oak Park River Forest Bankshares, Inc. | Non-interest Expense
Business Acquisition [Line Items]
Acquisition advisory expenses			2,400,000		2,500,000	2,300,000
Core system conversion expenses			$ 703,000		$ 703,000	$ 2,000,000

Acquisition - Summary of Fair V

Acquisition - Summary of Fair Values of Assets and Liabilities Assumed as of Acquisition Date (Details) - USD ($) $ in Thousands	May 15, 2019	Apr. 30, 2019	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018
Consideration paid
Goodwill			$ 148,353	$ 148,353	$ 148,353	$ 145,638	$ 128,177	$ 128,177
Oak Park River Forest Bankshares, Inc.
Assets
Cash and cash equivalents		$ 10,469
Securities available-for-sale		30,343
Restricted stock		414
Loans		257,423
Premises and equipment		3,488
Other real estate owned		2,201
Other intangible assets		6,220
Bank-owned life insurance		3,485
Deferred tax assets, net		5,925
Other assets		1,231
Total assets acquired		321,199
Liabilities
Deposits		290,171
Line of credit		5,655
Federal Home Loan Bank advances		5,300
Accrued expenses and other liabilities		4,766
Total liabilities assumed		305,892
Net assets acquired		15,307
Consideration paid
Common stock (1,464,558 shares issued at $20.02 per share)		29,320
Consideration paid in cash	$ 4,200	6,163
Total consideration paid		35,483
Goodwill		$ 20,176

Acquisition - Summary of Fair_2

Acquisition - Summary of Fair Values of Assets and Liabilities Assumed as of Acquisition Date (Parenthetical) (Details) - Oak Park River Forest Bankshares, Inc.	Apr. 30, 2019$ / sharesshares
Business Acquisition [Line Items]
Stock issued (in shares) | shares	1,464,558
Stock issued (in dollars per share) | $ / shares	$ 20.02

Acquisition - Summary of Acquir

Acquisition - Summary of Acquired Non-Impaired Loans as of Acquisition Date (Details) - Oak Park River Forest Bankshares, Inc. $ in Thousands	Apr. 30, 2019USD ($)
Business Acquisition [Line Items]
Fair value	$ 204,496
Gross contractual amounts receivable	254,755
Estimate of contractual cash flows not expected to be collected	12,987	[1]
Estimate of contractual cash flows expected to be collected	$ 241,768
[1]	Includes interest payments not expected to be collected due to loan prepayments as well as principal and interest payments not expected to be collected due to customer default.

Acquisition - Summary of Unaudi

Acquisition - Summary of Unaudited Pro Forma Information for Results of Operations (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019
Business Combinations [Abstract]
Total revenues (net interest income and non-interest income)	$ 68,003	$ 136,262
Net income	$ 13,982	$ 27,572
Earnings per share—basic	$ 0.35	$ 0.71
Earnings per share—diluted	$ 0.34	$ 0.70

Securities - Summary of Amortiz

Securities - Summary of Amortized Cost and Fair Values of Securities Available-for-sale (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost	$ 1,395,291	$ 1,183,404
Available-for-sale Securities, Gross Unrealized Gains	33,550	7,593
Available-for-sale Securities, Gross Unrealized Losses	(1,970)	(4,705)
Available-for-sale Securities, Fair Value	1,426,871	1,186,292
U.S. Treasury Notes
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost	30,443	41,403
Available-for-sale Securities, Gross Unrealized Gains	652	427
Available-for-sale Securities, Fair Value	31,095	41,830
U.S. Government Agencies
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost	137,002	165,162
Available-for-sale Securities, Gross Unrealized Gains	865	542
Available-for-sale Securities, Gross Unrealized Losses	(72)	(754)
Available-for-sale Securities, Fair Value	137,795	164,950
Obligations of States, Municipalities, and Political Subdivisions
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost	120,427	92,806
Available-for-sale Securities, Gross Unrealized Gains	4,735	2,075
Available-for-sale Securities, Gross Unrealized Losses	(6)	(49)
Available-for-sale Securities, Fair Value	125,156	94,832
Agency, Residential Mortgage-Backed Securities
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost	662,424	490,427
Available-for-sale Securities, Gross Unrealized Gains	17,566	2,163
Available-for-sale Securities, Gross Unrealized Losses	(125)	(2,354)
Available-for-sale Securities, Fair Value	679,865	490,236
Non-Agency, Residential Mortgage-Backed Securities
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost	75,844	109,501
Available-for-sale Securities, Gross Unrealized Gains	1,447	593
Available-for-sale Securities, Gross Unrealized Losses		(272)
Available-for-sale Securities, Fair Value	77,291	109,822
Agency, Commercial Mortgage-Backed Securities
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost	232,137	159,650
Available-for-sale Securities, Gross Unrealized Gains	7,028	1,092
Available-for-sale Securities, Gross Unrealized Losses	(111)	(1,041)
Available-for-sale Securities, Fair Value	239,054	159,701
Non-Agency, Commercial Mortgage-Backed Securities
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost	30,984	31,144
Available-for-sale Securities, Gross Unrealized Gains	237	130
Available-for-sale Securities, Fair Value	31,221	31,274
Corporate Securities
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost	55,599	48,796
Available-for-sale Securities, Gross Unrealized Gains	1,020	571
Available-for-sale Securities, Gross Unrealized Losses	(341)	(37)
Available-for-sale Securities, Fair Value	56,278	49,330
Asset-Backed Securities
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost	50,431	44,515
Available-for-sale Securities, Gross Unrealized Losses	(1,315)	(198)
Available-for-sale Securities, Fair Value	$ 49,116	$ 44,317

Securities - Summary of Amort_2

Securities - Summary of Amortized Cost and Fair Values of Securities Held-to-maturity (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Schedule Of Held To Maturity Securities [Line Items]
Held-to-maturity Securities, Amortized Cost	$ 4,404	$ 4,412
Held-to-maturity Securities, Gross Unrealized Gains	178	86
Held-to-maturity Securities, Fair Value	4,582	4,498
Obligations of States, Municipalities, and Political Subdivisions
Schedule Of Held To Maturity Securities [Line Items]
Held-to-maturity Securities, Amortized Cost	4,404	4,412
Held-to-maturity Securities, Gross Unrealized Gains	178	86
Held-to-maturity Securities, Fair Value	$ 4,582	$ 4,498

Securities - Additional Informa

Securities - Additional Information (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2020USD ($)Security	Jun. 30, 2019USD ($)	Jun. 30, 2020USD ($)Security	Jun. 30, 2019USD ($)	Dec. 31, 2019USD ($)
Schedule Of Investments [Line Items]
Trading securities	$ 0		$ 0		$ 0
Net gains or (losses) reclassified from accumulated other comprehensive income (loss) into earnings	0	$ 973,000	1,400,000	$ 973,000
Investment securities posted as collateral	1,000,000,000		1,000,000,000		552,400,000
Carrying amount of securities pledged as collateral	$ 330,900,000		$ 330,900,000		$ 301,100,000
Minimum
Schedule Of Investments [Line Items]
Percentage of shareholders equity for which securities holdings exceeds for no issuer other than U.S. Government and agencies	10.00%		10.00%		10.00%
Federal Home Loan Bank Advances
Schedule Of Investments [Line Items]
Carrying amount of securities pledged as collateral	$ 0		$ 0		$ 0
Public Fund Deposits
Schedule Of Investments [Line Items]
Carrying amount of securities pledged as collateral	263,500,000		263,500,000		240,400,000
Customer Repurchase Agreements
Schedule Of Investments [Line Items]
Carrying amount of securities pledged as collateral	$ 62,300,000		$ 62,300,000		$ 55,700,000
Available-for-sale Securities
Schedule Of Investments [Line Items]
Investment securities with unrealized losses | Security	35		35
Held-to-maturity Securities
Schedule Of Investments [Line Items]
Investment securities with unrealized losses | Security	0		0

Securities - Summary of Gross U

Securities - Summary of Gross Unrealized Losses and Fair Values, Aggregated by Investment Category and Length of Individual Securities Continuous Unrealized Loss Position Available-for-sale (Details) $ in Thousands	Jun. 30, 2020USD ($)Security	Dec. 31, 2019USD ($)Security
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Number of Securities | Security	35	99
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	$ 167,170	$ 343,722
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Unrealized Losses	(1,964)	(2,377)
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	542	257,869
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Unrealized Losses	(6)	(2,328)
Available-for-sale Securities, Continuous Unrealized Loss Position, Total Fair Value	167,712	601,591
Available-for-sale Securities, Continuous Unrealized Loss Position, Total Unrealized Losses	$ (1,970)	$ (4,705)
U.S. Government Agencies
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Number of Securities | Security	3	8
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	$ 27,051	$ 49,318
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Unrealized Losses	(72)	(662)
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value		20,283
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Unrealized Losses		(92)
Available-for-sale Securities, Continuous Unrealized Loss Position, Total Fair Value	27,051	69,601
Available-for-sale Securities, Continuous Unrealized Loss Position, Total Unrealized Losses	$ (72)	$ (754)
Obligations of States, Municipalities, and Political Subdivisions
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Number of Securities | Security	3	7
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	$ 415	$ 13,309
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Unrealized Losses	(6)	(45)
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value		1,419
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Unrealized Losses		(4)
Available-for-sale Securities, Continuous Unrealized Loss Position, Total Fair Value	415	14,728
Available-for-sale Securities, Continuous Unrealized Loss Position, Total Unrealized Losses	$ (6)	$ (49)
Agency, Residential Mortgage-Backed Securities
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Number of Securities | Security	7	50
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	$ 62,821	$ 132,703
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Unrealized Losses	(119)	(666)
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	542	193,363
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Unrealized Losses	(6)	(1,688)
Available-for-sale Securities, Continuous Unrealized Loss Position, Total Fair Value	63,363	326,066
Available-for-sale Securities, Continuous Unrealized Loss Position, Total Unrealized Losses	$ (125)	$ (2,354)
Non-Agency, Residential Mortgage-Backed Securities
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Number of Securities | Security		9
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value		$ 36,902
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Unrealized Losses		(206)
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value		10,126
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Unrealized Losses		(66)
Available-for-sale Securities, Continuous Unrealized Loss Position, Total Fair Value		47,028
Available-for-sale Securities, Continuous Unrealized Loss Position, Total Unrealized Losses		$ (272)
Agency, Commercial Mortgage-Backed Securities
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Number of Securities | Security	1	13
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	$ 10,139	$ 67,649
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Unrealized Losses	(111)	(563)
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value		32,678
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Unrealized Losses		(478)
Available-for-sale Securities, Continuous Unrealized Loss Position, Total Fair Value	10,139	100,327
Available-for-sale Securities, Continuous Unrealized Loss Position, Total Unrealized Losses	$ (111)	$ (1,041)
Corporate Securities
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Number of Securities | Security	12	4
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	$ 23,629	$ 6,103
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Unrealized Losses	(341)	(37)
Available-for-sale Securities, Continuous Unrealized Loss Position, Total Fair Value	23,629	6,103
Available-for-sale Securities, Continuous Unrealized Loss Position, Total Unrealized Losses	$ (341)	$ (37)
Asset-Backed Securities
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Number of Securities | Security	9	8
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	$ 43,115	$ 37,738
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Unrealized Losses	(1,315)	(198)
Available-for-sale Securities, Continuous Unrealized Loss Position, Total Fair Value	43,115	37,738
Available-for-sale Securities, Continuous Unrealized Loss Position, Total Unrealized Losses	$ (1,315)	$ (198)

Securities - Summary of Proceed

Securities - Summary of Proceeds From Sales of Securities Available-for-sale and Associated Gains and Losses (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Available For Sale Securities Gross Realized Gain Loss [Abstract]
Proceeds	$ 59,594	$ 45,417	$ 59,594
Gross gains	1,049	1,457	1,049
Gross losses	$ 76	$ 82	$ 76

Securities - Schedule of Amorti

Securities - Schedule of Amortized Cost and Fair Value of Debt Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Available-for-sale Securities Debt Maturities, Amortized Cost [Abstract]
Available-for-sale Securities, Due in one year or less, Amortized Cost	$ 30,114
Available-for-sale Securities, Due from one to five years, Amortized Cost	49,382
Available-for-sale Securities, Due from five to ten years, Amortized Cost	175,499
Available-for-sale Securities, Due after ten years, Amortized Cost	138,907
Available-for-sale Securities, Amortized Cost	1,395,291	$ 1,183,404
Held-to-maturity Securities Debt Maturities, Amortized Cost [Abstract]
Held-to-maturity Securities, Due in one year or less, Amortized Cost	504
Held-to-maturity Securities, Due from one to five years, Amortized Cost	3,900
Held-to-maturity Securities, Amortized Cost	4,404	4,412
Available-for-sale Securities Debt Maturities, Fair Value [Abstract]
Available-for-sale Securities, Due in one year or less, Fair Value	30,390
Available-for-sale Securities, Due from one to five years, Fair Value	50,805
Available-for-sale Securities, Due from five to ten years, Fair Value	178,405
Available-for-sale Securities, Due after ten years, Fair Value	139,840
Available-for-sale Securities, Fair Value, Total	1,426,871	1,186,292
Held-to-maturity Securities Debt Maturities, Fair Value [Abstract]
Held-to-maturity Securities, Due in one year or less, Fair Value	508
Held-to-maturity Securities, Due from one to five years, Fair Value	4,074
Held-to-maturity securities, Fair Value, Total	4,582	$ 4,498
Mortgage-Backed Securities
Available-for-sale Securities Debt Maturities, Amortized Cost [Abstract]
Available-for-sale Securities, Not due at single maturity, Amortized Cost	1,001,389
Available-for-sale Securities Debt Maturities, Fair Value [Abstract]
Available-for-sale Securities, Not due at single maturity, Fair Value	$ 1,027,431

Loan and Lease Receivables - Sc

Loan and Lease Receivables - Schedule of Outstanding Loan and Lease Receivables (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018
Accounts Notes And Loans Receivable [Line Items]
Total loans and leases	$ 4,380,330		$ 3,780,636
Net unamortized deferred fees and costs	8,271		2,289
Initial direct costs	2,521		2,736
Allowance for loan and lease losses	(51,300)	$ (41,840)	(31,936)	$ (31,132)	$ (27,106)	$ (25,201)
Net loans and leases	4,339,822		3,753,725
Lease financing receivables
Net minimum lease payments	188,826		193,359
Unguaranteed residual values	1,575		1,347
Unearned income	(16,094)		(16,932)
Total lease financing receivables	174,307		177,774
Initial direct costs	2,521		2,736
Lease financial receivables before allowance for lease losses	176,828		180,510
Commercial Real Estate
Accounts Notes And Loans Receivable [Line Items]
Total loans and leases	1,349,297		1,275,058
Allowance for loan and lease losses	(14,110)	(11,851)	(7,965)	(8,934)	(6,660)	(7,540)
Residential Real Estate
Accounts Notes And Loans Receivable [Line Items]
Total loans and leases	670,257		711,499
Allowance for loan and lease losses	(3,741)	(2,778)	(1,990)	(2,171)	(1,970)	(1,751)
Construction, Land Development, and Other Land
Accounts Notes And Loans Receivable [Line Items]
Total loans and leases	246,669		279,403
Allowance for loan and lease losses	(1,491)	(1,004)	(610)	(691)	(536)	(466)
Commercial and Industrial
Accounts Notes And Loans Receivable [Line Items]
Total loans and leases	1,309,523		1,330,418
Allowance for loan and lease losses	(30,108)	(24,139)	(19,377)	(17,126)	(15,630)	(12,932)
Paycheck Protection Program ("PPP")
Accounts Notes And Loans Receivable [Line Items]
Total loans and leases	626,593
Installment and Other
Accounts Notes And Loans Receivable [Line Items]
Total loans and leases	3,684		6,484
Allowance for loan and lease losses	(36)	(53)	(50)	(67)	(63)	(49)
Lease Financing Receivables
Accounts Notes And Loans Receivable [Line Items]
Total loans and leases	174,307		177,774
Allowance for loan and lease losses	$ (1,814)	$ (2,015)	$ (1,944)	$ (2,143)	$ (2,247)	$ (2,463)

Loan and Lease Receivables - Ad

Loan and Lease Receivables - Additional Information (Details) - USD ($)	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Jun. 30, 2019	Apr. 30, 2019	Mar. 31, 2019	Dec. 31, 2018
Accounts Notes And Loans Receivable [Line Items]
Total loans and leases	$ 4,380,330,000		$ 3,780,636,000
Loans held for sale pledged as security for borrowings	2,600,000,000		1,800,000,000
Allowance for loan and lease losses	51,300,000	$ 41,840,000	31,936,000	$ 31,132,000		$ 27,106,000	$ 25,201,000
Acquired Impaired Loans
Accounts Notes And Loans Receivable [Line Items]
Loans acquired					$ 52,927,000
Allowance for loan and lease losses	4,700,000		2,800,000
Acquired Impaired Loans | Oak Park River Forest Bankshares, Inc.
Accounts Notes And Loans Receivable [Line Items]
Loans acquired					$ 52,900,000
Acquired Non-Impaired Loans and Leases | Oak Park River Forest Bankshares, Inc.
Accounts Notes And Loans Receivable [Line Items]
Loans acquired	204,500,000
Installment and Other
Accounts Notes And Loans Receivable [Line Items]
Total loans and leases	3,684,000		6,484,000
Overdraft deposits reclassified as loans	304,000		852,000
Allowance for loan and lease losses	36,000	$ 53,000	50,000	$ 67,000		$ 63,000	$ 49,000
U.S. Government Guaranteed Loans
Accounts Notes And Loans Receivable [Line Items]
Total loans and leases	747,200,000		119,800,000
Discount on the unguaranteed portion of government guaranteed loans	$ 24,500,000		$ 23,100,000

Loan and Lease Receivables - Su

Loan and Lease Receivables - Summary of Minimum Annual Lease Payments for Lease Financing Receivables (Details) $ in Thousands	Jun. 30, 2020USD ($)
Receivables [Abstract]
2020	$ 36,115
2021	64,203
2022	46,052
2023	27,303
2024	12,721
Thereafter	2,432
Total	$ 188,826

Loan and Lease Receivables - _2

Loan and Lease Receivables - Summary of Balances for Each Respective Loan and Lease Category (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2019
Accounts Notes And Loans Receivable [Line Items]
Total loans and leases	$ 4,391,122	$ 3,785,661	$ 3,863,148
Originated
Accounts Notes And Loans Receivable [Line Items]
Total loans and leases	3,595,578	2,835,652
Acquired Impaired
Accounts Notes And Loans Receivable [Line Items]
Total loans and leases	235,684	258,668
Acquired Non-Impaired
Accounts Notes And Loans Receivable [Line Items]
Total loans and leases	559,860	691,341
Commercial Real Estate
Accounts Notes And Loans Receivable [Line Items]
Total loans and leases	1,350,956	1,276,542	1,311,539
Commercial Real Estate | Originated
Accounts Notes And Loans Receivable [Line Items]
Total loans and leases	919,510	792,263
Commercial Real Estate | Acquired Impaired
Accounts Notes And Loans Receivable [Line Items]
Total loans and leases	126,405	135,914
Commercial Real Estate | Acquired Non-Impaired
Accounts Notes And Loans Receivable [Line Items]
Total loans and leases	305,041	348,365
Residential Real Estate
Accounts Notes And Loans Receivable [Line Items]
Total loans and leases	670,764	711,822	777,762
Residential Real Estate | Originated
Accounts Notes And Loans Receivable [Line Items]
Total loans and leases	480,692	483,072
Residential Real Estate | Acquired Impaired
Accounts Notes And Loans Receivable [Line Items]
Total loans and leases	90,784	100,223
Residential Real Estate | Acquired Non-Impaired
Accounts Notes And Loans Receivable [Line Items]
Total loans and leases	99,288	128,527
Construction, Land Development, and Other Land
Accounts Notes And Loans Receivable [Line Items]
Total loans and leases	246,003	278,657	251,948
Construction, Land Development, and Other Land | Originated
Accounts Notes And Loans Receivable [Line Items]
Total loans and leases	219,261	235,794
Construction, Land Development, and Other Land | Acquired Impaired
Accounts Notes And Loans Receivable [Line Items]
Total loans and leases	4,784	5,373
Construction, Land Development, and Other Land | Acquired Non-Impaired
Accounts Notes And Loans Receivable [Line Items]
Total loans and leases	21,958	37,490
Commercial and Industrial
Accounts Notes And Loans Receivable [Line Items]
Total loans and leases	1,331,149	1,331,565	1,320,570
Commercial and Industrial | Originated
Accounts Notes And Loans Receivable [Line Items]
Total loans and leases	1,200,996	1,160,996
Commercial and Industrial | Acquired Impaired
Accounts Notes And Loans Receivable [Line Items]
Total loans and leases	13,485	16,909
Commercial and Industrial | Acquired Non-Impaired
Accounts Notes And Loans Receivable [Line Items]
Total loans and leases	116,668	153,660
Paycheck Protection Program ("PPP")
Accounts Notes And Loans Receivable [Line Items]
Total loans and leases	611,664
Paycheck Protection Program ("PPP") | Originated
Accounts Notes And Loans Receivable [Line Items]
Total loans and leases	611,664
Installment and Other
Accounts Notes And Loans Receivable [Line Items]
Total loans and leases	3,758	6,565	12,909
Installment and Other | Originated
Accounts Notes And Loans Receivable [Line Items]
Total loans and leases	2,714	5,372
Installment and Other | Acquired Impaired
Accounts Notes And Loans Receivable [Line Items]
Total loans and leases	226	249
Installment and Other | Acquired Non-Impaired
Accounts Notes And Loans Receivable [Line Items]
Total loans and leases	818	944
Lease Financing Receivables
Accounts Notes And Loans Receivable [Line Items]
Total loans and leases	176,828	180,510	$ 188,420
Lease Financing Receivables | Originated
Accounts Notes And Loans Receivable [Line Items]
Total loans and leases	160,741	158,155
Lease Financing Receivables | Acquired Non-Impaired
Accounts Notes And Loans Receivable [Line Items]
Total loans and leases	$ 16,087	$ 22,355

Loan and Lease Receivables - Es

Loan and Lease Receivables - Estimated Fair Value of Impaired Loans Acquired at Acquisition (Details) - Acquired Impaired Loans $ in Thousands	Apr. 30, 2019USD ($)
Accounts Notes And Loans Receivable [Line Items]
Undiscounted contractual cash flows	$ 74,092
Undiscounted cash flows not expected to be collected (non-accretable difference)	11,401
Undiscounted cash flows expected to be collected	62,691
Accretable yield at acquisition	(9,764)
Estimated fair value of impaired loans acquired at acquisition	$ 52,927

Loan and Lease Receivables - _3

Loan and Lease Receivables - Summary of Outstanding Balance and Carrying Amount of All Acquired Impaired Loans (Details) - Acquired Impaired Loans - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Accounts Notes And Loans Receivable [Line Items]
Outstanding Balance	$ 255,460	$ 380,880
Carrying Value	235,684	258,668
Commercial Real Estate
Accounts Notes And Loans Receivable [Line Items]
Outstanding Balance	134,224	189,969
Carrying Value	126,405	135,914
Residential Real Estate
Accounts Notes And Loans Receivable [Line Items]
Outstanding Balance	95,706	151,641
Carrying Value	90,784	100,223
Construction, Land Development, and Other Land
Accounts Notes And Loans Receivable [Line Items]
Outstanding Balance	7,530	14,841
Carrying Value	4,784	5,373
Commercial and Industrial
Accounts Notes And Loans Receivable [Line Items]
Outstanding Balance	17,716	23,330
Carrying Value	13,485	16,909
Installment and Other
Accounts Notes And Loans Receivable [Line Items]
Outstanding Balance	284	1,099
Carrying Value	$ 226	$ 249

Loan and Lease Receivables - _4

Loan and Lease Receivables - Summary of Changes in Accretable Yield for Acquired Impaired Loans (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Receivables [Abstract]
Beginning balance	$ 37,037	$ 29,340	$ 40,009	$ 37,115
Additions		8,501		8,501
Accretion to interest income	(4,452)	(5,996)	(9,657)	(11,245)
Reclassification from (to) nonaccretable difference, net	(717)	14,693	1,516	12,167
Ending balance	$ 31,868	$ 46,538	$ 31,868	$ 46,538

Loan and Lease Receivables - _5

Loan and Lease Receivables - Schedule of Unpaid Principal Balance and Carrying Value for Acquired Non-impaired Loans and Leases (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2019
Accounts Notes And Loans Receivable [Line Items]
Loans and leases	$ 4,391,122	$ 3,785,661	$ 3,863,148
Acquired Non-impaired Loans and Leases
Accounts Notes And Loans Receivable [Line Items]
Unpaid Principal Balance	574,419	710,161
Loans and leases	559,860	691,341
Commercial Real Estate
Accounts Notes And Loans Receivable [Line Items]
Loans and leases	1,350,956	1,276,542	1,311,539
Commercial Real Estate | Acquired Non-impaired Loans and Leases
Accounts Notes And Loans Receivable [Line Items]
Unpaid Principal Balance	312,284	356,787
Loans and leases	305,041	348,365
Residential Real Estate
Accounts Notes And Loans Receivable [Line Items]
Loans and leases	670,764	711,822	777,762
Residential Real Estate | Acquired Non-impaired Loans and Leases
Accounts Notes And Loans Receivable [Line Items]
Unpaid Principal Balance	100,571	130,412
Loans and leases	99,288	128,527
Construction, Land Development, and Other Land
Accounts Notes And Loans Receivable [Line Items]
Loans and leases	246,003	278,657	251,948
Construction, Land Development, and Other Land | Acquired Non-impaired Loans and Leases
Accounts Notes And Loans Receivable [Line Items]
Unpaid Principal Balance	22,411	38,416
Loans and leases	21,958	37,490
Commercial and Industrial
Accounts Notes And Loans Receivable [Line Items]
Loans and leases	1,331,149	1,331,565	1,320,570
Commercial and Industrial | Acquired Non-impaired Loans and Leases
Accounts Notes And Loans Receivable [Line Items]
Unpaid Principal Balance	120,626	159,599
Loans and leases	116,668	153,660
Installment and Other
Accounts Notes And Loans Receivable [Line Items]
Loans and leases	3,758	6,565	12,909
Installment and Other | Acquired Non-impaired Loans and Leases
Accounts Notes And Loans Receivable [Line Items]
Unpaid Principal Balance	840	971
Loans and leases	818	944
Lease Financing Receivables
Accounts Notes And Loans Receivable [Line Items]
Loans and leases	176,828	180,510	$ 188,420
Lease Financing Receivables | Acquired Non-impaired Loans and Leases
Accounts Notes And Loans Receivable [Line Items]
Unpaid Principal Balance	17,687	23,976
Loans and leases	$ 16,087	$ 22,355

Allowance for Loan and Lease _3

Allowance for Loan and Lease Losses and Reserve for Unfunded Commitments - Summary of Allowance for Loan and Lease Losses and Corresponding Loan and Lease Balances (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2019
Allowance for loan and lease losses
Beginning balance	$ 41,840	$ 27,106	$ 31,936	$ 25,201
Provisions	15,518	6,391	29,973	10,390
Charge-offs	(6,498)	(3,280)	(11,470)	(5,628)
Recoveries	440	915	861	1,169
Ending balance	51,300	31,132	51,300	31,132
Ending balance:
Individually evaluated for impairment					$ 14,014		$ 9,286
Collectively evaluated for impairment					32,550		18,371
Allowance for loan and lease losses	41,840	31,132	31,936	25,201	51,300	$ 31,936	31,132
Loans and leases ending balance:
Individually evaluated for impairment					78,290		45,884
Collectively evaluated for impairment					4,077,148		3,522,713
Total loans and leases					4,391,122	3,785,661	3,863,148
Loans Acquired with Deteriorated Credit Quality
Ending balance:
Loans acquired with deteriorated credit quality					4,736		3,475
Loans and leases ending balance:
Loans acquired with deteriorated credit quality					235,684		294,551
Commercial Real Estate
Allowance for loan and lease losses
Beginning balance	11,851	6,660	7,965	7,540
Provisions	3,306	2,695	7,728	3,137
Charge-offs	(1,088)	(818)	(1,640)	(2,169)
Recoveries	41	397	57	426
Ending balance	14,110	8,934	14,110	8,934
Ending balance:
Individually evaluated for impairment					3,525		2,775
Collectively evaluated for impairment					8,576		4,433
Allowance for loan and lease losses	14,110	8,934	7,965	7,540	14,110	7,965	8,934
Loans and leases ending balance:
Individually evaluated for impairment					36,751		18,707
Collectively evaluated for impairment					1,187,800		1,141,705
Total loans and leases					1,350,956	1,276,542	1,311,539
Commercial Real Estate | Loans Acquired with Deteriorated Credit Quality
Ending balance:
Loans acquired with deteriorated credit quality					2,009		1,726
Loans and leases ending balance:
Loans acquired with deteriorated credit quality					126,405		151,127
Residential Real Estate
Allowance for loan and lease losses
Beginning balance	2,778	1,970	1,990	1,751
Provisions	956	(62)	1,740	156
Charge-offs	(4)	(9)	(9)	(9)
Recoveries	11	272	20	273
Ending balance	3,741	2,171	3,741	2,171
Ending balance:
Individually evaluated for impairment					80		22
Collectively evaluated for impairment					2,898		1,559
Allowance for loan and lease losses	3,741	2,171	1,990	1,751	3,741	1,990	2,171
Loans and leases ending balance:
Individually evaluated for impairment					1,805		2,899
Collectively evaluated for impairment					578,175		656,329
Total loans and leases					670,764	711,822	777,762
Residential Real Estate | Loans Acquired with Deteriorated Credit Quality
Ending balance:
Loans acquired with deteriorated credit quality					763		590
Loans and leases ending balance:
Loans acquired with deteriorated credit quality					90,784		118,534
Construction, Land Development, and Other Land
Allowance for loan and lease losses
Beginning balance	1,004	536	610	466
Provisions	487	155	881	225
Ending balance	1,491	691	1,491	691
Ending balance:
Collectively evaluated for impairment					1,404		676
Allowance for loan and lease losses	1,491	691	610	466	1,491	610	691
Loans and leases ending balance:
Individually evaluated for impairment					4,189
Collectively evaluated for impairment					237,030		247,728
Total loans and leases					246,003	278,657	251,948
Construction, Land Development, and Other Land | Loans Acquired with Deteriorated Credit Quality
Ending balance:
Loans acquired with deteriorated credit quality					87		15
Loans and leases ending balance:
Loans acquired with deteriorated credit quality					4,784		4,220
Commercial and Industrial
Allowance for loan and lease losses
Beginning balance	24,139	15,630	19,377	12,932
Provisions	10,695	3,320	19,241	6,352
Charge-offs	(4,845)	(1,827)	(8,803)	(2,179)
Recoveries	119	3	293	21
Ending balance	30,108	17,126	30,108	17,126
Ending balance:
Individually evaluated for impairment					10,409		6,489
Collectively evaluated for impairment					17,822		9,495
Allowance for loan and lease losses	30,108	17,126	19,377	12,932	30,108	19,377	17,126
Loans and leases ending balance:
Individually evaluated for impairment					35,545		24,278
Collectively evaluated for impairment					1,282,119		1,275,922
Total loans and leases					1,331,149	1,331,565	1,320,570
Commercial and Industrial | Loans Acquired with Deteriorated Credit Quality
Ending balance:
Loans acquired with deteriorated credit quality					1,877		1,142
Loans and leases ending balance:
Loans acquired with deteriorated credit quality					13,485		20,370
Paycheck Protection Program ("PPP")
Loans and leases ending balance:
Collectively evaluated for impairment					611,664
Total loans and leases					611,664
Installment and Other
Allowance for loan and lease losses
Beginning balance	53	63	50	49
Provisions	(17)	8	(14)	22
Charge-offs		(4)		(4)
Ending balance	36	67	36	67
Ending balance:
Collectively evaluated for impairment					36		65
Allowance for loan and lease losses	36	67	50	49	36	50	67
Loans and leases ending balance:
Collectively evaluated for impairment					3,532		12,609
Total loans and leases					3,758	6,565	12,909
Installment and Other | Loans Acquired with Deteriorated Credit Quality
Ending balance:
Loans acquired with deteriorated credit quality							2
Loans and leases ending balance:
Loans acquired with deteriorated credit quality					226		300
Lease Financing Receivables
Allowance for loan and lease losses
Beginning balance	2,015	2,247	1,944	2,463
Provisions	91	275	397	498
Charge-offs	(561)	(622)	(1,018)	(1,267)
Recoveries	269	243	491	449
Ending balance	1,814	2,143	1,814	2,143
Ending balance:
Collectively evaluated for impairment					1,814		2,143
Allowance for loan and lease losses	$ 1,814	$ 2,143	$ 1,944	$ 2,463	1,814	1,944	2,143
Loans and leases ending balance:
Collectively evaluated for impairment					176,828		188,420
Total loans and leases					$ 176,828	$ 180,510	$ 188,420

Allowance for Loan and Lease _4

Allowance for Loan and Lease Losses and Reserve for Unfunded Commitments - Additional Information (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Loans And Leases Receivable Disclosure [Line Items]
Increase (decrease) in allowance for loan and lease losses	$ 9,500,000	$ 4,000,000	$ 19,400,000	$ 5,900,000
Commitments outstanding on troubled debt restructurings	0		0		$ 500,000
Recorded investment in troubled debt restructurings that subsequently defaulted within twelve months	0	348,000	0	348,000
Reserve for unfunded commitments	1,900,000		1,900,000		$ 1,200,000
Provisions for (credits to) unfunded commitments	492,000	183,000	691,000	28,000
Charge-offs or recoveries related to reserve for unfunded commitments	0	0	$ 0	0
Paycheck Protection Program ("PPP")
Loans And Leases Receivable Disclosure [Line Items]
Percentage of guarantee on SBA			100.00%
Acquired Impaired Loans
Loans And Leases Receivable Disclosure [Line Items]
Increase (decrease) in allowance for loan and lease losses	434,000	629,000	$ 2,000,000	740,000
Individually Evaluated For Impairment
Loans And Leases Receivable Disclosure [Line Items]
Increase (decrease) in allowance for loan and lease losses	579,000	1,700,000	3,300,000	2,600,000
Collectively Evaluated For Impairment
Loans And Leases Receivable Disclosure [Line Items]
Increase (decrease) in allowance for loan and lease losses	$ 8,400,000	$ 1,700,000	$ 14,100,000	$ 2,600,000

Allowance for Loan and Lease _5

Allowance for Loan and Lease Losses and Reserve for Unfunded Commitments - Summary of Recorded Investment, Unpaid Principal Balance, and Related Allowance for Loans and Leases Considered Impaired (Details) - Loans Excluding Acquired Impaired Loans - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Financing Receivable Impaired [Line Items]
Recorded Investment	$ 78,290	$ 68,741
Unpaid Principal Balance	247,658	75,668
Related Allowance	14,014	10,690
Commercial Real Estate
Financing Receivable Impaired [Line Items]
Recorded Investment, With no related allowance recorded	24,950	16,556
Recorded Investment, With an allowance recorded	11,801	9,840
Unpaid Principal Balance, With no related allowance recorded	91,211	19,808
Unpaid Principal Balance, With an allowance recorded	47,249	10,691
Related Allowance	3,525	2,614
Residential Real Estate
Financing Receivable Impaired [Line Items]
Recorded Investment, With no related allowance recorded	1,534	2,165
Recorded Investment, With an allowance recorded	271	233
Unpaid Principal Balance, With no related allowance recorded	1,624	2,253
Unpaid Principal Balance, With an allowance recorded	274	233
Related Allowance	80	124
Construction, Land Development, and Other Land
Financing Receivable Impaired [Line Items]
Recorded Investment, With no related allowance recorded	4,189	2,644
Unpaid Principal Balance, With no related allowance recorded	4,216	3,000
Commercial and Industrial
Financing Receivable Impaired [Line Items]
Recorded Investment, With no related allowance recorded	16,774	19,211
Recorded Investment, With an allowance recorded	18,771	18,092
Unpaid Principal Balance, With no related allowance recorded	43,215	20,398
Unpaid Principal Balance, With an allowance recorded	59,869	19,285
Related Allowance	$ 10,409	$ 7,952

Allowance for Loan and Lease _6

Allowance for Loan and Lease Losses and Reserve for Unfunded Commitments - Summary of Average Recorded Investment and Interest Income Recognized for Loans and Leases Considered Impaired (Details) - Loans Excluding Acquired Impaired Loans - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Financing Receivable Impaired [Line Items]
Average Recorded Investment	$ 78,549	$ 40,517
Interest Income Recognized	2,158	843
Commercial Real Estate
Financing Receivable Impaired [Line Items]
Average Recorded Investment, With no related allowance recorded	20,544	8,094
Average Recorded Investment, With an allowance recorded	13,402	6,793
Interest Income Recognized, With no related allowance recorded	555	187
Interest Income Recognized, With an allowance recorded	339	155
Residential Real Estate
Financing Receivable Impaired [Line Items]
Average Recorded Investment, With no related allowance recorded	1,398	1,785
Average Recorded Investment, With an allowance recorded	512	219
Interest Income Recognized, With no related allowance recorded	15	27
Interest Income Recognized, With an allowance recorded	21	4
Construction, Land Development, and Other Land
Financing Receivable Impaired [Line Items]
Average Recorded Investment, With no related allowance recorded	3,094
Interest Income Recognized, With no related allowance recorded	220
Commercial and Industrial
Financing Receivable Impaired [Line Items]
Average Recorded Investment, With no related allowance recorded	16,651	11,583
Average Recorded Investment, With an allowance recorded	22,948	12,043
Interest Income Recognized, With no related allowance recorded	262	223
Interest Income Recognized, With an allowance recorded	$ 746	$ 247

Allowance for Loan and Lease _7

Allowance for Loan and Lease Losses and Reserve for Unfunded Commitments - Summary of Risk Rating Categories of Loans and Leases Considered for Inclusion in Allowance for Loan and Lease Losses Calculation (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2019
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	$ 4,391,122	$ 3,785,661	$ 3,863,148
Commercial Real Estate
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	1,350,956	1,276,542	1,311,539
Residential Real Estate
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	670,764	711,822	777,762
Construction, Land Development, and Other Land
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	246,003	278,657	251,948
Commercial and Industrial
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	1,331,149	1,331,565	1,320,570
Paycheck Protection Program ("PPP")
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	611,664
Installment and Other
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	3,758	6,565	12,909
Lease Financing Receivables
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	176,828	180,510	$ 188,420
Loans Excluding Acquired Impaired Loans
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	4,155,438	3,526,993
Loans Excluding Acquired Impaired Loans | Commercial Real Estate
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	1,224,551	1,140,628
Loans Excluding Acquired Impaired Loans | Residential Real Estate
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	579,980	611,599
Loans Excluding Acquired Impaired Loans | Construction, Land Development, and Other Land
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	241,219	273,284
Loans Excluding Acquired Impaired Loans | Commercial and Industrial
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	1,317,664	1,314,656
Loans Excluding Acquired Impaired Loans | Paycheck Protection Program ("PPP")
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	611,664
Loans Excluding Acquired Impaired Loans | Installment and Other
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	3,532	6,316
Loans Excluding Acquired Impaired Loans | Lease Financing Receivables
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	176,828	180,510
Loans Excluding Acquired Impaired Loans | Pass
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	3,637,466	3,088,584
Loans Excluding Acquired Impaired Loans | Pass | Commercial Real Estate
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	1,012,490	984,881
Loans Excluding Acquired Impaired Loans | Pass | Residential Real Estate
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	551,885	584,363
Loans Excluding Acquired Impaired Loans | Pass | Construction, Land Development, and Other Land
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	232,121	247,775
Loans Excluding Acquired Impaired Loans | Pass | Commercial and Industrial
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	1,053,606	1,087,856
Loans Excluding Acquired Impaired Loans | Pass | Paycheck Protection Program ("PPP")
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	611,664
Loans Excluding Acquired Impaired Loans | Pass | Installment and Other
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	3,257	6,013
Loans Excluding Acquired Impaired Loans | Pass | Lease Financing Receivables
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	172,443	177,696
Loans Excluding Acquired Impaired Loans | Watch
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	338,790	299,432
Loans Excluding Acquired Impaired Loans | Watch | Commercial Real Estate
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	139,224	99,803
Loans Excluding Acquired Impaired Loans | Watch | Residential Real Estate
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	20,614	21,856
Loans Excluding Acquired Impaired Loans | Watch | Construction, Land Development, and Other Land
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	3,472	18,181
Loans Excluding Acquired Impaired Loans | Watch | Commercial and Industrial
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	175,207	159,282
Loans Excluding Acquired Impaired Loans | Watch | Installment and Other
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	273	302
Loans Excluding Acquired Impaired Loans | Watch | Lease Financing Receivables
Financing Receivable Recorded Investment [Line Items]
Total loans and leases		8
Loans Excluding Acquired Impaired Loans | Special Mention
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	97,455	64,559
Loans Excluding Acquired Impaired Loans | Special Mention | Commercial Real Estate
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	37,306	27,484
Loans Excluding Acquired Impaired Loans | Special Mention | Residential Real Estate
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	3,731	3,648
Loans Excluding Acquired Impaired Loans | Special Mention | Construction, Land Development, and Other Land
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	1,437	4,684
Loans Excluding Acquired Impaired Loans | Special Mention | Commercial and Industrial
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	52,739	26,944
Loans Excluding Acquired Impaired Loans | Special Mention | Lease Financing Receivables
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	2,242	1,799
Loans Excluding Acquired Impaired Loans | Substandard
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	81,158	74,139
Loans Excluding Acquired Impaired Loans | Substandard | Commercial Real Estate
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	35,531	28,460
Loans Excluding Acquired Impaired Loans | Substandard | Residential Real Estate
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	3,750	1,732
Loans Excluding Acquired Impaired Loans | Substandard | Construction, Land Development, and Other Land
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	4,189	2,644
Loans Excluding Acquired Impaired Loans | Substandard | Commercial and Industrial
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	36,112	40,574
Loans Excluding Acquired Impaired Loans | Substandard | Installment and Other
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	2	1
Loans Excluding Acquired Impaired Loans | Substandard | Lease Financing Receivables
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	1,574	728
Loans Excluding Acquired Impaired Loans | Doubtful
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	569	279
Loans Excluding Acquired Impaired Loans | Doubtful | Lease Financing Receivables
Financing Receivable Recorded Investment [Line Items]
Total loans and leases	$ 569	$ 279

Allowance for Loan and Lease _8

Allowance for Loan and Lease Losses and Reserve for Unfunded Commitments - Summary of Contractual Delinquency Information (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2019
Financing Receivable Recorded Investment Past Due [Line Items]
Total loans and leases	$ 4,391,122	$ 3,785,661	$ 3,863,148
Commercial Real Estate
Financing Receivable Recorded Investment Past Due [Line Items]
Total loans and leases	1,350,956	1,276,542	1,311,539
Residential Real Estate
Financing Receivable Recorded Investment Past Due [Line Items]
Total loans and leases	670,764	711,822	777,762
Construction, Land Development, and Other Land
Financing Receivable Recorded Investment Past Due [Line Items]
Total loans and leases	246,003	278,657	251,948
Commercial and Industrial
Financing Receivable Recorded Investment Past Due [Line Items]
Total loans and leases	1,331,149	1,331,565	1,320,570
Paycheck Protection Program ("PPP")
Financing Receivable Recorded Investment Past Due [Line Items]
Total loans and leases	611,664
Installment and Other
Financing Receivable Recorded Investment Past Due [Line Items]
Total loans and leases	3,758	6,565	12,909
Lease Financing Receivables
Financing Receivable Recorded Investment Past Due [Line Items]
Total loans and leases	176,828	180,510	$ 188,420
Acquired Non-Impaired and Originated Loans
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	53,176	76,436
Non-accrual	40,505	36,272
Current	4,102,262	3,450,557
Total loans and leases	4,155,438	3,526,993
Acquired Non-Impaired and Originated Loans | 30-59 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	9,380	25,963
Acquired Non-Impaired and Originated Loans | 60-89 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	3,291	14,201
Acquired Non-Impaired and Originated Loans | Commercial Real Estate
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	22,977	31,696
Non-accrual	17,963	12,274
Current	1,201,574	1,108,932
Total loans and leases	1,224,551	1,140,628
Acquired Non-Impaired and Originated Loans | Commercial Real Estate | 30-59 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	2,864	14,269
Acquired Non-Impaired and Originated Loans | Commercial Real Estate | 60-89 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	2,150	5,153
Acquired Non-Impaired and Originated Loans | Residential Real Estate
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	4,431	5,018
Non-accrual	1,780	1,371
Current	575,549	606,581
Total loans and leases	579,980	611,599
Acquired Non-Impaired and Originated Loans | Residential Real Estate | 30-59 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	2,302	3,187
Acquired Non-Impaired and Originated Loans | Residential Real Estate | 60-89 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	349	460
Acquired Non-Impaired and Originated Loans | Construction, Land Development, and Other Land
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due		4,460
Current	241,219	268,824
Total loans and leases	241,219	273,284
Acquired Non-Impaired and Originated Loans | Construction, Land Development, and Other Land | 60-89 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due		4,460
Acquired Non-Impaired and Originated Loans | Commercial and Industrial
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	22,758	33,534
Non-accrual	19,100	22,151
Current	1,294,906	1,281,122
Total loans and leases	1,317,664	1,314,656
Acquired Non-Impaired and Originated Loans | Commercial and Industrial | 30-59 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	3,298	7,789
Acquired Non-Impaired and Originated Loans | Commercial and Industrial | 60-89 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	360	3,594
Acquired Non-Impaired and Originated Loans | Paycheck Protection Program ("PPP")
Financing Receivable Recorded Investment Past Due [Line Items]
Current	611,664
Total loans and leases	611,664
Acquired Non-Impaired and Originated Loans | Installment and Other
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	42	136
Non-accrual	2	1
Current	3,490	6,180
Total loans and leases	3,532	6,316
Acquired Non-Impaired and Originated Loans | Installment and Other | 30-59 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	4	133
Acquired Non-Impaired and Originated Loans | Installment and Other | 60-89 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	36	2
Acquired Non-Impaired and Originated Loans | Lease Financing Receivables
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	2,968	1,592
Non-accrual	1,660	475
Current	173,860	178,918
Total loans and leases	176,828	180,510
Acquired Non-Impaired and Originated Loans | Lease Financing Receivables | 30-59 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	912	585
Acquired Non-Impaired and Originated Loans | Lease Financing Receivables | 60-89 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	$ 396	$ 532

Allowance for Loan and Lease _9

Allowance for Loan and Lease Losses and Reserve for Unfunded Commitments - Summary of TDR's by Loan Category (Details) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2020USD ($)Loan	Dec. 31, 2019USD ($)Loan
Financing Receivable Modifications [Line Items]
Number of Loans | Loan	31	27
Pre-Modification Outstanding Recorded Investment	$ 11,606	$ 12,700
Post-Modification Outstanding Recorded Investment	10,600	10,571
Charge-offs	1,006	2,129
Specific Reserves	$ 4,011	$ 2,166
Accruing
Financing Receivable Modifications [Line Items]
Number of Loans | Loan	11	9
Pre-Modification Outstanding Recorded Investment	$ 3,151	$ 1,771
Post-Modification Outstanding Recorded Investment	3,151	1,771
Specific Reserves	$ 199	$ 341
Non-accruing
Financing Receivable Modifications [Line Items]
Number of Loans | Loan	20	18
Pre-Modification Outstanding Recorded Investment	$ 8,455	$ 10,929
Post-Modification Outstanding Recorded Investment	7,449	8,800
Charge-offs	1,006	2,129
Specific Reserves	$ 3,812	$ 1,825
Commercial Real Estate | Accruing
Financing Receivable Modifications [Line Items]
Number of Loans | Loan	7	5
Pre-Modification Outstanding Recorded Investment	$ 2,856	$ 1,451
Post-Modification Outstanding Recorded Investment	2,856	1,451
Specific Reserves	$ 98	$ 223
Commercial Real Estate | Non-accruing
Financing Receivable Modifications [Line Items]
Number of Loans | Loan	6	6
Pre-Modification Outstanding Recorded Investment	$ 2,840	$ 2,777
Post-Modification Outstanding Recorded Investment	1,911	2,600
Charge-offs	929	177
Specific Reserves	$ 55	$ 513
Commercial and Industrial | Accruing
Financing Receivable Modifications [Line Items]
Number of Loans | Loan	2	2
Pre-Modification Outstanding Recorded Investment	$ 123	$ 129
Post-Modification Outstanding Recorded Investment	123	129
Specific Reserves	$ 101	$ 118
Commercial and Industrial | Non-accruing
Financing Receivable Modifications [Line Items]
Number of Loans | Loan	13	11
Pre-Modification Outstanding Recorded Investment	$ 5,524	$ 8,048
Post-Modification Outstanding Recorded Investment	5,447	6,096
Charge-offs	77	1,952
Specific Reserves	$ 3,757	$ 1,312
Residential Real Estate | Accruing
Financing Receivable Modifications [Line Items]
Number of Loans | Loan	2	2
Pre-Modification Outstanding Recorded Investment	$ 172	$ 191
Post-Modification Outstanding Recorded Investment	$ 172	$ 191
Residential Real Estate | Non-accruing
Financing Receivable Modifications [Line Items]
Number of Loans | Loan	1	1
Pre-Modification Outstanding Recorded Investment	$ 91	$ 104
Post-Modification Outstanding Recorded Investment	$ 91	$ 104

Allowance for Loan and Lease_10

Allowance for Loan and Lease Losses and Reserve for Unfunded Commitments - Summary of Loans Modified as Troubled Debt Restructurings (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Receivables [Abstract]
Beginning balance	$ 1,725	$ 1,921	$ 1,771	$ 1,813
Additions				113
Net payments	(30)	(44)	(76)	(49)
Net transfers from (to) non-accrual	1,456	(348)	1,456	(348)
Ending balance	3,151	1,529	3,151	1,529
Beginning balance	12,117	7,119	8,800	7,314
Additions	1,375	1,182	5,633	1,428
Net payments	(445)	(815)	(1,386)	(726)
Charge-offs	(4,142)		(4,142)	(530)
Net transfers from (to) accrual	(1,456)	348	(1,456)	348
Ending balance	7,449	7,834	7,449	7,834
Total troubled debt restructurings	$ 10,600	$ 9,363	$ 10,600	$ 9,363

Servicing Assets - Activity for

Servicing Assets - Activity for Servicing Assets and Related Changes in Fair Value (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Transfers And Servicing [Abstract]
Beginning balance	$ 17,800,000	$ 19,534,000	$ 19,471,000	$ 19,693,000
Additions, net	1,262,000	1,449,000	2,655,000	2,551,000
Changes in fair value	(711,000)	(1,223,000)	(3,775,000)	(2,484,000)
Ending balance	$ 18,351,000	$ 19,760,000	$ 18,351,000	$ 19,760,000

Servicing Assets - Unpaid Princ

Servicing Assets - Unpaid Principal Balances of Loans Serviced for Others (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Loan portfolios serviced for:
Unpaid principal balances of loans serviced	$ 1,402,326	$ 1,351,006
SBA guaranteed loans
Loan portfolios serviced for:
Unpaid principal balances of loans serviced	1,278,876	1,231,959
USDA guaranteed loans
Loan portfolios serviced for:
Unpaid principal balances of loans serviced	$ 123,450	$ 119,047

Servicing Assets - Additional I

Servicing Assets - Additional Information (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Accounts Notes And Loans Receivable [Line Items]
Changes in fair value of servicing assets	$ (711,000)	$ (1,223,000)	$ (3,775,000)	$ (2,484,000)
Loan Servicing Revenue [Member]
Accounts Notes And Loans Receivable [Line Items]
Fair value of servicing assets	$ 3,000,000	$ 2,600,000	$ 5,700,000	$ 5,200,000

Other Real Estate Owned - Chang

Other Real Estate Owned - Change in Other Real Estate Owned (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Banking And Thrift [Abstract]
Other real estate owned, beginning balance	$ 9,273	$ 4,595	$ 9,896	$ 5,041
Acquisitions of OREO through business combination		2,201		2,201
Net additions to OREO	64	510	86	536
Proceeds from sales of OREO	(386)	(702)	(650)	(1,057)
Gains (losses) on sales of OREO	3	6	85	(27)
Valuation adjustments	(302)	(79)	(765)	(163)
Other real estate owned, ending balance	$ 8,652	$ 6,531	$ 8,652	$ 6,531

Other Real Estate Owned - Addit

Other Real Estate Owned - Additional Information (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018
Real Estate [Line Items]
Foreclosed real estate properties recorded as result of obtaining physical possession of property	$ 8,652,000	$ 6,531,000	$ 8,652,000	$ 6,531,000	$ 9,273,000	$ 9,896,000	$ 4,595,000	$ 5,041,000
Residential consumer mortgage loans in process of foreclosure	2,100,000		2,100,000			2,100,000
Proceeds from sale of internally financed sales of OREO	0	$ 0	0	$ 183,000
Residential Real Estate
Real Estate [Line Items]
Foreclosed real estate properties recorded as result of obtaining physical possession of property	$ 1,200,000		$ 1,200,000			$ 1,500,000

Goodwill, Core Deposit Intang_3

Goodwill, Core Deposit Intangible and Other Intangible Assets - Summary of Changes in Goodwill, Core Deposit Intangible Assets and Customer Relationship Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Schedule Of Goodwill And Intangible Assets [Line Items]
Beginning balance, Goodwill	$ 148,353	$ 128,177	$ 148,353	$ 128,177
Additions		17,461		17,461
Ending balance, Goodwill	148,353	145,638	148,353	145,638
Amortization	(1,892)	(1,959)	(3,785)	(3,732)
Core Deposits
Schedule Of Goodwill And Intangible Assets [Line Items]
Beginning balance	27,285	28,654	29,111	30,360
Additions		6,220		6,220
Amortization	(1,826)	(1,892)	(3,652)	(3,598)
Ending balance	25,459	32,982	25,459	32,982
Accumulated amortization	$ 30,007	$ 22,484	$ 30,007	$ 22,484
Weighted average remaining amortization period	6 years	7 years	6 years	7 years
Customer Relationships
Schedule Of Goodwill And Intangible Assets [Line Items]
Beginning balance	$ 2,724	$ 2,992	$ 2,791	$ 3,059
Amortization	(66)	(66)	(133)	(133)
Ending balance	2,658	2,926	2,658	2,926
Accumulated amortization	$ 558	$ 290	$ 558	$ 290
Weighted average remaining amortization period	9 years 10 months 24 days	10 years 10 months 24 days	9 years 10 months 24 days	10 years 10 months 24 days

Goodwill, Core Deposit Intang_4

Goodwill, Core Deposit Intangible and Other Intangible Assets - Estimated Amortization Expense for Core Deposit Intangible and Customer Relationship Intangible Recognized (Details) $ in Thousands	Jun. 30, 2020USD ($)
Goodwill And Intangible Assets Disclosure [Abstract]
2020	$ 3,785
2021	6,998
2022	6,426
2023	4,371
2024	2,286
Thereafter	4,251
Total	$ 28,117

Income Taxes - Additional Infor

Income Taxes - Additional Information (Details) - USD ($)	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Effective tax rate	28.30%	27.70%
Net income tax provision related to exercise of stock options	$ 76,000	$ 76,000
Net income tax benefit related to vesting of restricted shares	(65,000)	$ (65,000)
Deferred tax assets, net	$ 37,100,000		$ 38,300,000

Deposits - Composition of Depos

Deposits - Composition of Deposits (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Deposits [Abstract]
Non-interest-bearing demand deposits	$ 1,768,675	$ 1,279,641
Interest-bearing checking accounts	503,909	338,185
Money market demand accounts	1,233,748	881,387
Other savings	525,043	475,839
Time deposits (below $250,000)	710,429	916,723
Time deposits ($250,000 and above)	216,541	255,802
Total deposits	$ 4,958,345	$ 4,147,577

Deposits - Additional Informati

Deposits - Additional Information (Details) - USD ($)	Jun. 30, 2020	Dec. 31, 2019
Deposits [Abstract]
Brokered deposits	$ 56,000,000	$ 41,000,000

Other Borrowings - Summary of O

Other Borrowings - Summary of Other Borrowings (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Debt Disclosure [Abstract]
Paycheck Protection Program Liquidity Facility	$ 449,889
Federal Home Loan Bank advances	4,000	$ 490,000
Securities sold under agreements to repurchase	56,525	49,638
Total	$ 510,414	$ 539,638

Other Borrowings - Additional I

Other Borrowings - Additional Information (Details) - USD ($)	Apr. 21, 2020	Oct. 10, 2019	Jun. 30, 2020	Dec. 31, 2019	Oct. 13, 2016
Line Of Credit Facility [Line Items]
Paycheck protection program liquidity facility			$ 449,889,000
Federal Reserve Bank discount window borrowing			0	$ 0
Federal Home Loan Bank advances			$ 4,000,000	490,000,000
Federal home loan bank advances, Fixed interest rate			0.00%
Federal home loan bank fixed rate advances, maturity date			2021-05
Federal home loan bank advances maximum borrowing capacity as percentage of total assets			35.00%
Federal home loan bank, required investment conversion ratio			4.50
Federal Reserve Bank of Chicago Discount Window Line
Line Of Credit Facility [Line Items]
Paycheck protection program liquidity facility			$ 449,900,000
Debt instrument, interest rate			0.35%
Federal Reserve Bank of Chicago Discount Window Line | Minimum
Line Of Credit Facility [Line Items]
Line of credit facility, maturity month and year			2022-04
Federal Reserve Bank of Chicago Discount Window Line | Maximum [Member]
Line Of Credit Facility [Line Items]
Line of credit facility, maturity month and year			2022-05
Federal Reserve Bank of Chicago Discount Window Line | Letter Agreement
Line Of Credit Facility [Line Items]
Interest rate spread	0.35%
Correspondent Bank | Ridgestone
Line Of Credit Facility [Line Items]
Line of credit facility, amount		$ 15,000,000
Line of credit facility, extended maturity date		Oct. 9, 2020
Line of credit facility, interest rate terms			The amended revolving line of credit bears interest at either the London Interbank Offered Rate (“LIBOR”) plus 195 basis points or the Prime Rate minus 75 basis points, based on the Company’s election, which is required to be communicated at least three business days prior to the commencement of an interest period. If the Company fails to provide timely notification, the interest rate will be Prime Rate minus 75 basis points. At June 30, 2020 and December 31, 2019, the line of credit had no outstanding balance.
Correspondent Bank | Ridgestone | LIBOR Rate
Line Of Credit Facility [Line Items]
Interest rate spread		2.50%
Correspondent Bank | Ridgestone | Prime Rate
Line Of Credit Facility [Line Items]
Interest rate spread		0.25%
Correspondent Bank | Credit agreement | Ridgestone
Line Of Credit Facility [Line Items]
Line of credit facility, amount					$ 30,000,000
Correspondent Bank | Fifth Amendment Revolving Credit Agreement | Ridgestone
Line Of Credit Facility [Line Items]
Line of credit facility, amount			$ 0	$ 0

Other Borrowings - Summary of S

Other Borrowings - Summary of Short-term Credit Lines Available for Use (Details) - USD ($) $ in Thousands		Jun. 30, 2020	Dec. 31, 2019
Available Federal Funds Line
Debt Instrument [Line Items]
Short-term credit lines available for use	[1]	$ 115,000	$ 115,000
Federal Reserve Bank of Chicago Discount Window Line
Debt Instrument [Line Items]
Short-term credit lines available for use		884,968	547,798
Federal Home Loan Bank Line
Debt Instrument [Line Items]
Short-term credit lines available for use		$ 1,980,351	$ 1,390,698
[1]	The June 30, 2020

Other Borrowings - Summary of_2

Other Borrowings - Summary of Short-term Credit Lines Available for Use (Parenthetical) (Details) - USD ($)	Jun. 30, 2020	Dec. 31, 2019
Available Federal Funds Line
Debt Instrument [Line Items]
Short-term credit lines available for use, outstanding	$ 0	$ 0

Subordinated Notes and Junior_3

Subordinated Notes and Junior Subordinated Debentures - Additional Information (Details) - USD ($)	Aug. 03, 2020	Jun. 26, 2020	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Debt Instrument [Line Items]
Principal amount			$ 45,000,000		$ 45,000,000		$ 46,500,000
Other non-interest expense			3,736,000	$ 4,351,000	$ 8,351,000	$ 8,433,000
6.00 % Fixed-To-Floating Subordinate Notes Mature on July 1, 2030 | Subordinated Notes
Debt Instrument [Line Items]
Debt instrument, face amount		$ 50,000,000
Debt instrument, interest rate		6.00%
Debt instrument, maturity date		Jul. 1, 2030
Debt instrument, redemption, description					The Company may, at its option, redeem the notes, in whole or in part, on a semi-annual basis beginning on July 1, 2025, subject to obtaining the prior approval of the Federal Reserve to the extent such approval is then required.
Debt issuance costs		$ 1,200,000
Debt issuance costs, amortization period		10 years
6.00 % Fixed-To-Floating Subordinate Notes Mature on July 1, 2030 | Subordinated Notes | Subsequent Event
Debt Instrument [Line Items]
Debt instrument, face amount	$ 25,000,000
Debt instrument, interest rate	6.00%
Debt instrument, maturity date	Jul. 1, 2030
6.00 % Fixed-To-Floating Subordinate Notes Mature on July 1, 2030 | Subordinated Notes | Three-Month Secured Overnight Financing Rate Plus 588 Basis Points
Debt Instrument [Line Items]
Debt instrument, description of variable rate basis					The subordinated notes bear a fixed interest rate of 6.00% until July 1, 2025 and a floating interest rate equal to a benchmark rate, which is expected to be three-month Secured Overnight Financing Rate plus 588 basis points thereafter until maturity.
Metropolitan Statutory Trust 1
Debt Instrument [Line Items]
Principal amount			$ 35,000,000		$ 35,000,000		$ 35,000,000
Metropolitan Statutory Trust 1 | Junior Subordinated Debentures
Debt Instrument [Line Items]
Debt instrument, maturity date					Mar. 17, 2034
Contractual rate			3.09%		3.09%		4.69%
Accrued interest payable			$ 43,000		$ 43,000		$ 71,000
Metropolitan Statutory Trust 1 | Junior Subordinated Debentures | Three-month LIBOR
Debt Instrument [Line Items]
Debt instrument, description of variable rate basis					Three-month LIBOR + 2.79%
Interest rate spread					2.79%		2.79%
RidgeStone Capital Trust I
Debt Instrument [Line Items]
Principal amount							$ 1,500,000
RidgeStone Capital Trust I | Junior Subordinated Debentures
Debt Instrument [Line Items]
Debt instrument, maturity date					Jun. 30, 2033
Contractual rate							6.38%
Accrued interest payable			0		$ 0		$ 0
Redemption of debentures in whole at par value					1,500,000
Other non-interest expense					$ 112,000
RidgeStone Capital Trust I | Junior Subordinated Debentures | Five-year LIBOR
Debt Instrument [Line Items]
Debt instrument, description of variable rate basis					Five-year LIBOR + 3.50%
Interest rate spread					3.50%		3.50%
First Evanston Bancorp Trust I
Debt Instrument [Line Items]
Principal amount			$ 10,000,000		$ 10,000,000		$ 10,000,000
First Evanston Bancorp Trust I | Junior Subordinated Debentures
Debt Instrument [Line Items]
Debt instrument, maturity date					Mar. 15, 2035
Contractual rate			2.09%		2.09%		3.67%
Accrued interest payable			$ 9,000		$ 9,000		$ 17,000
First Evanston Bancorp Trust I | Junior Subordinated Debentures | Three-month LIBOR
Debt Instrument [Line Items]
Debt instrument, description of variable rate basis					Three-month LIBOR + 1.78%
Interest rate spread					1.78%		1.78%

Subordinated Notes and Junior_4

Subordinated Notes and Junior Subordinated Debentures - Junior Subordinated Debentures by Issuance (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2020	Dec. 31, 2019
Shares Subject To Mandatory Redemption By Settlement Terms [Line Items]
Total liability, at par	$ 45,000	$ 46,500
Total liability, at carrying value	36,206	37,334
Metropolitan Statutory Trust 1
Shares Subject To Mandatory Redemption By Settlement Terms [Line Items]
Total liability, at par	35,000	35,000
RidgeStone Capital Trust I
Shares Subject To Mandatory Redemption By Settlement Terms [Line Items]
Total liability, at par		1,500
First Evanston Bancorp Trust I
Shares Subject To Mandatory Redemption By Settlement Terms [Line Items]
Total liability, at par	10,000	10,000
Junior Subordinated Debentures
Shares Subject To Mandatory Redemption By Settlement Terms [Line Items]
Discount	$ (8,794)	$ (9,166)
Junior Subordinated Debentures | Metropolitan Statutory Trust 1
Shares Subject To Mandatory Redemption By Settlement Terms [Line Items]
Stated Maturity	Mar. 17, 2034
Contractual Rate	3.09%	4.69%
Junior Subordinated Debentures | Metropolitan Statutory Trust 1 | Three-month LIBOR
Shares Subject To Mandatory Redemption By Settlement Terms [Line Items]
Interest Rate Spread, Description	Three-month LIBOR + 2.79%
Interest Rate Spread	2.79%	2.79%
Junior Subordinated Debentures | RidgeStone Capital Trust I
Shares Subject To Mandatory Redemption By Settlement Terms [Line Items]
Stated Maturity	Jun. 30, 2033
Contractual Rate		6.38%
Junior Subordinated Debentures | RidgeStone Capital Trust I | Five-year LIBOR
Shares Subject To Mandatory Redemption By Settlement Terms [Line Items]
Interest Rate Spread, Description	Five-year LIBOR + 3.50%
Interest Rate Spread	3.50%	3.50%
Junior Subordinated Debentures | First Evanston Bancorp Trust I
Shares Subject To Mandatory Redemption By Settlement Terms [Line Items]
Stated Maturity	Mar. 15, 2035
Contractual Rate	2.09%	3.67%
Junior Subordinated Debentures | First Evanston Bancorp Trust I | Three-month LIBOR
Shares Subject To Mandatory Redemption By Settlement Terms [Line Items]
Interest Rate Spread, Description	Three-month LIBOR + 1.78%
Interest Rate Spread	1.78%	1.78%

Commitments and Contingent Li_3

Commitments and Contingent Liabilities - Summary of Minimum Annual Rental Commitments for Operating Leases (Details) $ in Thousands	Jun. 30, 2020USD ($)
Commitments And Contingencies Disclosure [Abstract]
2020	$ 2,258
2021	4,148
2022	2,380
2023	1,382
2024	1,249
Thereafter	2,148
Total	$ 13,565

Commitments and Contingent Li_4

Commitments and Contingent Liabilities - Additional Information (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Commitments And Contingencies Liabilities [Line Items]
Rental expenses	$ 1,700,000	$ 1,500,000	$ 3,300,000	$ 2,800,000
Sublease income	182,000	$ 190,000	365,000	$ 370,000
Minimum rental to be received in future on subleases	$ 930,000		$ 930,000
Sublease contract maturity year			2025
Fixed rate loan commitments maturity year			2050
Variable rate loan commitments maturity year			2048
Maximum
Commitments And Contingencies Liabilities [Line Items]
Commitments to make loans period			90 days
Loan commitments fixed interest rate	18.00%		18.00%
Loan commitments variable interest rate	10.00%		10.00%
Minimum
Commitments And Contingencies Liabilities [Line Items]
Loan commitments fixed interest rate	1.25%		1.25%
Loan commitments variable interest rate	1.25%		1.25%

Commitments and Contingent Li_5

Commitments and Contingent Liabilities - Summary of Contract or Notional Amount of Outstanding Loan and Lease Commitments (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2020	Dec. 31, 2019
Commitments And Contingencies Liabilities [Line Items]
Fixed Rate	$ 82,414	$ 56,576
Variable Rate	1,025,080	973,896
Total	1,107,494	1,030,472
Commitments to Extend Credit
Commitments And Contingencies Liabilities [Line Items]
Fixed Rate	81,722	55,852
Variable Rate	962,873	908,382
Total	1,044,595	964,234
Letters of Credit
Commitments And Contingencies Liabilities [Line Items]
Fixed Rate	692	724
Variable Rate	62,207	65,514
Total	$ 62,899	$ 66,238

Fair Value Measurement - Summar

Fair Value Measurement - Summary of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Securities available-for-sale, at fair value	$ 1,426,871		$ 1,186,292
Servicing assets, at fair value	18,351	$ 17,800	19,471	$ 19,760	$ 19,534	$ 19,693
Derivative assets	20,084		7,960
Derivative liabilities	21,393		8,519
Equity and other securities, at fair value	8,181		8,031
U.S. Treasury Notes
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Securities available-for-sale, at fair value	31,095		41,830
U.S. Government Agencies
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Securities available-for-sale, at fair value	137,795		164,950
Obligations of States, Municipalities, and Political Subdivisions
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Securities available-for-sale, at fair value	125,156		94,832
Corporate Securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Securities available-for-sale, at fair value	56,278		49,330
Asset-Backed Securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Securities available-for-sale, at fair value	49,116		44,317
Fair Value, Measurements, Recurring
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Servicing assets, at fair value	18,351		19,471
Derivative assets	20,084		7,960
Derivative liabilities	21,393		8,519
Fair Value, Measurements, Recurring | Mutual Funds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Securities available-for-sale, at fair value	2,996
Equity and other securities, at fair value			2,952
Fair Value, Measurements, Recurring | Equity Securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Securities available-for-sale, at fair value	5,185
Equity and other securities, at fair value			5,079
Fair Value, Measurements, Recurring | U.S. Treasury Notes
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Securities available-for-sale, at fair value	31,095		41,830
Fair Value, Measurements, Recurring | U.S. Government Agencies
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Securities available-for-sale, at fair value	137,795		164,950
Fair Value, Measurements, Recurring | Obligations of States, Municipalities, and Political Subdivisions
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Securities available-for-sale, at fair value	125,156		94,832
Fair Value, Measurements, Recurring | Mortgage-Backed Securities; Residential | Agency
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Securities available-for-sale, at fair value	679,865		490,236
Fair Value, Measurements, Recurring | Mortgage-Backed Securities; Residential | Non-Agency
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Securities available-for-sale, at fair value	77,291		109,822
Fair Value, Measurements, Recurring | Mortgage-Backed Securities; Commercial | Agency
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Securities available-for-sale, at fair value	239,054		159,701
Fair Value, Measurements, Recurring | Mortgage-Backed Securities; Commercial | Non-Agency
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Securities available-for-sale, at fair value	31,221		31,274
Fair Value, Measurements, Recurring | Corporate Securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Securities available-for-sale, at fair value	56,278		49,330
Fair Value, Measurements, Recurring | Asset-Backed Securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Securities available-for-sale, at fair value	49,116		44,317
Fair Value, Measurements, Recurring | Level 1 | Mutual Funds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Securities available-for-sale, at fair value	2,996
Equity and other securities, at fair value			2,952
Fair Value, Measurements, Recurring | Level 1 | U.S. Treasury Notes
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Securities available-for-sale, at fair value	31,095		41,830
Fair Value, Measurements, Recurring | Level 2
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Derivative assets	20,084		7,960
Derivative liabilities	21,393		8,519
Fair Value, Measurements, Recurring | Level 2 | Equity Securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Securities available-for-sale, at fair value	4,501
Equity and other securities, at fair value			4,379
Fair Value, Measurements, Recurring | Level 2 | U.S. Government Agencies
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Securities available-for-sale, at fair value	137,795		164,950
Fair Value, Measurements, Recurring | Level 2 | Obligations of States, Municipalities, and Political Subdivisions
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Securities available-for-sale, at fair value	125,156		94,832
Fair Value, Measurements, Recurring | Level 2 | Mortgage-Backed Securities; Residential | Agency
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Securities available-for-sale, at fair value	679,865		490,236
Fair Value, Measurements, Recurring | Level 2 | Mortgage-Backed Securities; Residential | Non-Agency
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Securities available-for-sale, at fair value	77,291		109,822
Fair Value, Measurements, Recurring | Level 2 | Mortgage-Backed Securities; Commercial | Agency
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Securities available-for-sale, at fair value	239,054		159,701
Fair Value, Measurements, Recurring | Level 2 | Mortgage-Backed Securities; Commercial | Non-Agency
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Securities available-for-sale, at fair value	31,221		31,274
Fair Value, Measurements, Recurring | Level 2 | Corporate Securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Securities available-for-sale, at fair value	56,278		49,330
Fair Value, Measurements, Recurring | Level 2 | Asset-Backed Securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Securities available-for-sale, at fair value	49,116		44,317
Fair Value, Measurements, Recurring | Level 3
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Servicing assets, at fair value	18,351		19,471
Fair Value, Measurements, Recurring | Level 3 | Equity Securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Securities available-for-sale, at fair value	$ 684
Equity and other securities, at fair value			$ 700

Fair Value Measurement - Additi

Fair Value Measurement - Additional Information (Details) - USD ($)	Jun. 30, 2020	Jun. 30, 2019
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Abstract]
Fair value, assets, to or from level 3 transfers, amount	$ 0	$ 0
Fair value, liabilities, to or from level 3 transfers, amount	0	0
Fair value, equity, to or from level 3 transfers, amount	$ 0	$ 0

Fair Value Measurement - Summ_2

Fair Value Measurement - Summary of Financial Assets Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Investment Securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Balance, beginning of period	$ 700	$ 886
Amortization		3
Change in fair value	(19)	1
Balance, end of period	681	890
Servicing Assets
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Balance, beginning of period	19,471	19,693
Additions, net	2,655	2,551
Change in fair value	(3,775)	(2,484)
Balance, end of period	$ 18,351	$ 19,760

Fair Value Measurement - Summ_3

Fair Value Measurement - Summary of Unobservable Inputs Used in the Fair Value Measurements on Recurring Basis (Details) - Fair Value, Measurements, Recurring - Level 3	6 Months Ended
	Jun. 30, 2020
Single Issuer Trust Preferred
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Impact to Valuation from an Increased or Higher Input Value	Decrease
Debt Instrument, Valuation Technique [Extensible List]	us-gaap:ValuationTechniqueDiscountedCashFlowMember
Debt Instrument, Measurement Input [Extensible List]	us-gaap:MeasurementInputDiscountRateMember
Single Issuer Trust Preferred | Minimum
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Unobservable Inputs	0.049
Single Issuer Trust Preferred | Maximum
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Unobservable Inputs	0.054
Single Issuer Trust Preferred | Weighted Average
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Unobservable Inputs	0.055
Servicing Assets
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Servicing Asset, Valuation Technique [Extensible List]	us-gaap:ValuationTechniqueDiscountedCashFlowMember
Servicing Assets | Prepayment Speeds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Impact to Valuation from an Increased or Higher Input Value	Decrease
Servicing Assets | Prepayment Speeds | Minimum
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Unobservable Inputs	0.017
Servicing Assets | Prepayment Speeds | Maximum
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Unobservable Inputs	0.292
Servicing Assets | Prepayment Speeds | Weighted Average
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Unobservable Inputs	0.160
Servicing Assets | Discount Rate
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Impact to Valuation from an Increased or Higher Input Value	Decrease
Servicing Assets | Discount Rate | Minimum
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Unobservable Inputs	0.021
Servicing Assets | Discount Rate | Maximum
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Unobservable Inputs	0.376
Servicing Assets | Discount Rate | Weighted Average
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Unobservable Inputs	0.115
Servicing Assets | Expected Weighted Average Loan life
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Impact to Valuation from an Increased or Higher Input Value	Increase
Servicing Assets | Expected Weighted Average Loan life | Minimum
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Expected weighted average loan life	1 month 6 days
Servicing Assets | Expected Weighted Average Loan life | Maximum
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Expected weighted average loan life	8 years 9 months 18 days
Servicing Assets | Expected Weighted Average Loan life | Weighted Average
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Expected weighted average loan life	3 years 8 months 12 days

Fair Value Measurement - Summ_4

Fair Value Measurement - Summary of Assets Measured at Fair Value on Non-Recurring Basis, Excluding Acquired Impaired Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Commercial Real Estate
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Assets, Fair Value	$ 33,226	$ 23,782
Residential Real Estate
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Assets, Fair Value	1,725	2,274
Construction, Land Development, and Other Land
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Assets, Fair Value	4,189	2,644
Commercial and Industrial
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Assets, Fair Value	25,136	29,351
Other Real Estate Owned
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Assets, Fair Value	8,652	9,896
Assets Held For Sale
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Assets, Fair Value	15,264	15,362
Level 3 | Commercial Real Estate
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Assets, Fair Value	33,226	23,782
Level 3 | Residential Real Estate
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Assets, Fair Value	1,725	2,274
Level 3 | Construction, Land Development, and Other Land
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Assets, Fair Value	4,189	2,644
Level 3 | Commercial and Industrial
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Assets, Fair Value	25,136	29,351
Level 3 | Other Real Estate Owned
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Assets, Fair Value	8,652	9,896
Level 3 | Assets Held For Sale
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Assets, Fair Value	$ 15,264	$ 15,362

Fair Value Measurement - Summ_5

Fair Value Measurement - Summary of Estimated Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Financial assets
Cash and due from banks	$ 51,818	$ 48,228
Interest bearing deposits with other banks	88,113	32,509
Securities held-to-maturity, fair value	4,582	4,498
Restricted stock, at cost	6,232	22,127
Loans held for sale	3,031	11,732
Loans and lease receivables, net (less impaired loans at fair value	4,339,822	3,753,725
Financial liabilities
Paycheck Protection Program Liquidity Facility	449,889
Federal Home Loan Bank advances	4,000	490,000
Securities sold under agreements to repurchase	56,525	49,638
Subordinated notes, net	48,777
Junior subordinated debentures issued to capital trusts, net	36,206	37,334
Level 1 | Carrying Amount
Financial assets
Cash and due from banks	51,818	48,228
Level 1 | Estimate of Fair Value Measurement
Financial assets
Cash and due from banks	51,818	48,228
Level 2 | Carrying Amount
Financial assets
Interest bearing deposits with other banks	88,113	32,509
Securities held-to-maturity, fair value	4,404	4,412
Restricted stock, at cost	6,232	22,127
Financial liabilities
Non-interest-bearing deposits	1,768,675	1,279,641
Interest-bearing deposits	3,189,670	2,867,936
Accrued interest payable	1,928	3,677
Paycheck Protection Program Liquidity Facility	449,889
Federal Home Loan Bank advances	4,000	490,000
Securities sold under agreements to repurchase	56,525	49,638
Subordinated notes, net	50,000
Level 2 | Estimate of Fair Value Measurement
Financial assets
Interest bearing deposits with other banks	88,113	32,509
Securities held-to-maturity, fair value	4,582	4,498
Restricted stock, at cost	6,232	22,127
Financial liabilities
Non-interest-bearing deposits	1,768,675	1,279,641
Interest-bearing deposits	3,193,090	2,873,380
Accrued interest payable	1,928	3,677
Paycheck Protection Program Liquidity Facility	449,889
Federal Home Loan Bank advances	4,000	490,000
Securities sold under agreements to repurchase	56,525	49,638
Subordinated notes, net	49,999
Level 3 | Carrying Amount
Financial assets
Loans held for sale	3,031	11,732
Loans and lease receivables, net (less impaired loans at fair value	4,275,546	3,695,674
Accrued interest receivable	15,633	13,283
Financial liabilities
Junior subordinated debentures issued to capital trusts, net	36,206	37,334
Level 3 | Estimate of Fair Value Measurement
Financial assets
Loans held for sale	3,357	12,935
Loans and lease receivables, net (less impaired loans at fair value	4,211,233	3,661,724
Accrued interest receivable	15,633	13,283
Financial liabilities
Junior subordinated debentures issued to capital trusts, net	$ 40,310	$ 42,881

Derivative Instruments and He_3

Derivative Instruments and Hedge Activities - Summary of Derivative Financial Instruments and Classification on Consolidated Statements of Financial Condition (Details) - USD ($)	Jun. 30, 2020	Dec. 31, 2019
Derivatives Fair Value [Line Items]
Notional Amount	$ 382,732,000	$ 341,358,000
Other Assets	20,084,000	7,960,000
Other Liabilities	21,393,000	8,519,000
Other Interest Rate Derivatives
Derivatives Fair Value [Line Items]
Notional Amount	373,862,000
Other Assets	20,084,000
Other Liabilities	21,370,000
Derivatives Not Designated As Hedging Instruments | Other Credit Derivatives
Derivatives Fair Value [Line Items]
Notional Amount	8,870,000	9,302,000
Other Liabilities	23,000	12,000
Derivatives Not Designated As Hedging Instruments | Other Interest Rate Derivatives
Derivatives Fair Value [Line Items]
Notional Amount	373,862,000	332,056,000
Other Assets	20,084,000	7,960,000
Other Liabilities	$ 21,370,000	$ 8,507,000

Derivative Instruments and He_4

Derivative Instruments and Hedge Activities - Additional Information (Details) - USD ($)	1 Months Ended	3 Months Ended		6 Months Ended
	Sep. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Derivative [Line Items]
Derivative notional amount		$ 382,732,000		$ 382,732,000		$ 341,358,000
Unrealized gain (loss) to be reclassified as an decrease to interest expense during the next twelve months		(85,000)		(85,000)
Fair value of derivatives net liability position		21,400,000		21,400,000
Collateral amount posted		21,300,000		21,300,000
Settlement obligation termination value		21,400,000		21,400,000
Other Interest Rate Derivatives
Derivative [Line Items]
Derivative notional amount		373,862,000		$ 373,862,000
Derivative maturity date, start year				Jan. 31, 2022
Derivative maturity date, end year				Mar. 31, 2030
Derivative instruments transaction fees		154,000	$ 392,000	$ 660,000	$ 717,000
Other Credit Derivatives
Derivative [Line Items]
Derivative notional amount		8,900,000		8,900,000		9,300,000
Derivatives Designated as Hedging Instruments | Interest Rate Swaps | Cash Flow Hedging
Derivative [Line Items]
Derivative notional amount		0		0		$ 0
Termination of designated as cash flow hedges to reduce interest risk	$ 250,000,000
Transaction, net of tax	$ 383,000
Remaining balance in accumulated other comprehensive income		$ 329,000		$ 329,000

Derivative Instruments and He_5

Derivative Instruments and Hedge Activities - Summary of Net Gains (Losses) Recorded in Accumulated Other Comprehensive Income (Loss) and Consolidated Statements of Operations Relating to Cash Flow Derivative Instruments (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Derivative [Line Items]
Amount of Loss Recognized in OCI	$ (3,417)		$ (5,234)
Interest Rate Swaps
Derivative [Line Items]
Amount of Loss Recognized in OCI			(5,234)
Amount of Loss Reclassified from OCI to Income as an Increase to Interest Expense		$ (42)	$ 1,280

Derivative Instruments and He_6

Derivative Instruments and Hedge Activities - Summary of Other Interest Rate Derivatives (Details) - USD ($)	6 Months Ended
	Jun. 30, 2020	Dec. 31, 2019
Derivative [Line Items]
Notional Amount	$ 382,732,000	$ 341,358,000
Derivative assets fair value	20,084,000	7,960,000
Derivative liabilities fair value	21,393,000	$ 8,519,000
Other Interest Rate Derivatives
Derivative [Line Items]
Notional Amount	373,862,000
Derivative assets fair value	20,084,000
Derivative liabilities fair value	$ 21,370,000
Weighted average pay rates	4.49%
Weighted average receive rates	2.68%
Weighted average maturity	6 years 4 months 24 days

Derivative Instruments and He_7

Derivative Instruments and Hedge Activities - Summary of Amounts Included in Non-Interest Income in Consolidated Statements of Operations Relating to Derivative Instruments not Designated in Hedging Relationship (Details) - Non-Interest Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Derivative [Line Items]
Amounts relating to derivative instruments, not designated in hedging relationship	$ (16)	$ (224)	$ (751)	$ (376)
Other Credit Derivatives
Derivative [Line Items]
Amounts relating to derivative instruments, not designated in hedging relationship	1	(3)	(11)	(4)
Other Interest Rate Derivatives
Derivative [Line Items]
Amounts relating to derivative instruments, not designated in hedging relationship	$ (17)	$ (221)	$ (740)	$ (372)

Derivative Instruments and He_8

Derivative Instruments and Hedge Activities - Summary of Company's Interest Rate Derivative and Offsetting Positions (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Gross amounts recognized	$ 20,084	$ 7,960
Net amount presented in the Consolidated Statements of Financial Condition	20,084	7,960
Gross amounts not offset in the Consolidated Statements of Financial Condition
Offsetting derivative positions		(1)
Collateral posted	(20,084)	(7,959)
Gross amounts recognized	21,393	8,519
Net amount presented in the Consolidated Statements of Financial Condition	21,393	8,519
Gross amounts not offset in the Consolidated Statements of Financial Condition
Offsetting derivative positions		(1)
Collateral posted	(21,261)	$ (8,518)
Net credit exposure	$ 132

Share-Based Compensation - Addi

Share-Based Compensation - Additional Information (Details) - USD ($)

May 15, 2019

Apr. 30, 2019

Oct. 03, 2017

Jul. 06, 2017

Feb. 29, 2020

Oct. 31, 2014

Jun. 30, 2020

Mar. 31, 2020

Dec. 31, 2019

Sep. 30, 2019

Jun. 30, 2019

Mar. 31, 2019

Jun. 30, 2020

Jun. 30, 2019

Dec. 31, 2019

Dec. 31, 2018

Dec. 31, 2017

Dec. 31, 2016

Dec. 31, 2015

Jun. 30, 2017

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Common stock, voting par value

$ 0.01

$ 0.01

$ 0.01

$ 0.01

Proceeds from the exercise of stock options

$ 733,000

$ 2,305,000

Oak Park River Forest Bankshares, Inc.

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Consideration paid in cash

$ 4,200,000

$ 6,163,000

Business combination conversion of outstanding options

35,870

Performance Options Grants

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Options vested

414,894

Common Stock

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Issuance of common stock in connection with restricted stock awards, shares

174,036

16,345

36,350

136,469

(8,500)

Number of options exercised

5,196

55,402

71,029

3,472

116,048

50,662

Common Stock | Restricted Shares

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Shares of restricted voting common stock granted

174,179

Common stock, voting par value

$ 0.01

Shares vested

4,571

Common Stock | Restricted Shares | Each Anniversary of Grant Date Over Four Years

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Award vesting period

4 years

Shares vest on grant date

103,465

Common Stock | Restricted Shares | Each Anniversary of Grant Date Vest Over Three Years

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Award vesting period

3 years

Shares vest on grant date

38,786

Omnibus Plan

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Number of common stock reserved for issuance

1,550,000

Number of common shares available for future grants

995,845

995,845

Omnibus Plan | Restricted Shares

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Award vesting period

4 years

Shares of restricted voting common stock granted

174,179

Restricted shares vested

53,832

48,491

Fair value of restricted shares, vested

$ 593,000

$ 900,000

Fair value of unvested restricted stock awards

$ 5,900,000

$ 5,900,000

Omnibus Plan | Performance-based Restricted Shares

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Shares of restricted voting common stock granted

31,928

20,975

11,165

Period for number of shares earned under return on average assets

3 years

3 years

3 years

Minimum target percentage in assets of peer group consisting publicly-traded bank holding companies

50.00%

Maximum target percentage in assets of peer group consisting publicly-traded bank holding companies

200.00%

Omnibus Plan | Performance-based Restricted Shares | Threshold performance

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Percentage of target number of shares to be earned

25.00%

Omnibus Plan | Performance-based Restricted Shares | 50th Percentile Performance

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Percentage of target number of shares to be earned

100.00%

Omnibus Plan | Performance-based Restricted Shares | 75th Percentile Performance

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Percentage of target number of shares to be earned

125.00%

Omnibus Plan | Common Stock

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Issuance of common stock in connection with restricted stock awards, shares

58,900

11,898

Omnibus Plan | Common Stock | Restricted Shares

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Shares of restricted voting common stock granted

189,647

131,157

Common stock, voting par value

$ 0.01

$ 0.01

$ 0.01

Omnibus Plan | Common Stock | Restricted Shares | Each Anniversary of Grant Date Over Four Years

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Award vesting period

4 years

4 years

Shares vest on grant date

111,823

102,559

Omnibus Plan | Common Stock | Restricted Shares | Each Anniversary of Grant Date Vest Over Three Years

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Award vesting period

3 years

3 years

Shares vest on grant date

72,570

15,165

Omnibus Plan | Common Stock | Restricted Shares | First Anniversary of Grant Date

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Shares vest on grant date

683

2,268

BYB Plan

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Number of common shares available for future grants

0

Number of options granted

0

212,400

1,634,568

Number of shares outstanding

1,390,579

1,410,075

1,390,579

1,410,075

Options vested

20,000

Number of options exercised

19,496

127,997

Proceeds from the exercise of stock options

$ 253,000

$ 1,900,000

Tax benefit from exercise of stock options

$ 39,000

$ 145,000

BYB Plan | Maximum

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Number of common shares available for future grants

2,476,122

BYB Plan | Time Options Grants

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Award contractual term

10 years

BYB Plan | Time Options Grants | Maximum

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Award vesting period

5 years

BYB Plan | Time Options Grants | Minimum

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Award vesting period

1 year

BYB Plan | Performance Options Grants

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Award contractual term

10 years

BYB Plan | Performance Options Grants | Maximum

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Award vesting period

5 years

BYB Plan | Performance Options Grants | Minimum

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Award vesting period

1 year

FEB Plan

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Number of shares outstanding

470,067

511,169

470,067

511,169

Number of options exercised

41,102

113,214

Proceeds from the exercise of stock options

$ 479,000

$ 1,300,000

Tax benefit from exercise of stock options

$ 87,000

$ 253,000

Conversion calculation percentage

472.50%

472.50%

Share-Based Compensation - Summ

Share-Based Compensation - Summary of Changes in Restricted Shares (Details) - Omnibus Plan - Restricted Shares - $ / shares	6 Months Ended	12 Months Ended
	Jun. 30, 2020	Dec. 31, 2019
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares, beginning balance	328,653
Number of shares, granted	174,179
Number of shares, vested	(53,832)	(48,491)
Number of shares, forfeited	(143)
Number of shares, ending balance	448,857	328,653
Weighted average grant date fair value, beginning balance	$ 19.94
Weighted average grant date fair value, granted	17.52
Weighted average grant date fair value, vested	20.76
Weighted average grant date fair value, forfeited	17.50
Weighted average grant date fair value, ending balance	$ 18.90	$ 19.94

Share-Based Compensation - Su_2

Share-Based Compensation - Summary of Stock Compensation Expense (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total share-based compensation (benefit)	$ 7	$ (133)
Income tax benefit (expense)	$ 2	(37)
Unrecognized compensation expense		$ 35
Weighted-average amortization period remaining	0 years	8 months 12 days
Restricted Shares
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total share-based compensation	$ 1,336	$ 807
Income tax benefit	372	225
Unrecognized compensation expense	$ 6,329	$ 4,829
Weighted-average amortization period remaining	2 years 8 months 12 days	3 years

Share-Based Compensation - Su_3

Share-Based Compensation - Summary Activity in shares Subjected to Options and Weighted Average Exercise Prices (Details) $ / shares in Units, $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2020USD ($)$ / sharesshares	Dec. 31, 2019USD ($)$ / sharesshares
BYB Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Shares, Beginning balance | shares	1,410,075
Number of Shares, Exercised | shares	(19,496)	(127,997)
Number of Shares, Ending balance | shares	1,390,579	1,410,075
Number of Shares, Exercisable | shares	1,390,579
Weighted Average Exercise Price, Beginning balance | $ / shares	$ 11.38
Weighted Average Exercise Price, Exercised | $ / shares	13
Weighted Average Exercise Price, Ending balance | $ / shares	11.36	$ 11.38
Weighted Average Exercise Price, Exercisable | $ / shares	$ 11.36
Intrinsic Value, Beginning balance | $	$ 11,542
Intrinsic Value, Exercised | $	139
Intrinsic Value, Ending balance | $	2,574	$ 11,542
Intrinsic Value, Exercisable | $	$ 2,574
Weighted Average Remaining Contractual Term (in Years)	4 years 10 months 24 days	5 years 4 months 24 days
Weighted Average Remaining Contractual Term (in Years), Exercisable	4 years 10 months 24 days
FEB Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Shares, Beginning balance | shares	511,169
Number of Shares, Exercised | shares	(41,102)	(113,214)
Number of Shares, Ending balance | shares	470,067	511,169
Number of Shares, Exercisable | shares	470,067
Weighted Average Exercise Price, Beginning balance | $ / shares	$ 11.35
Weighted Average Exercise Price, Exercised | $ / shares	11.65
Weighted Average Exercise Price, Ending balance | $ / shares	11.32	$ 11.35
Weighted Average Exercise Price, Exercisable | $ / shares	$ 11.32
Intrinsic Value, Beginning balance | $	$ 4,204
Intrinsic Value, Exercised | $	313
Intrinsic Value, Ending balance | $	837	$ 4,204
Intrinsic Value, Exercisable | $	$ 837
Weighted Average Remaining Contractual Term (in Years)	3 years 9 months 18 days	4 years 4 months 24 days
Weighted Average Remaining Contractual Term (in Years), Exercisable	3 years 9 months 18 days

Earnings per Share - Additional

Earnings per Share - Additional Information (Details) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Earnings Per Share Basic [Line Items]
Shares outstanding	37,919,480	37,263,352	37,931,406	36,719,436
Stock Options
Earnings Per Share Basic [Line Items]
Shares outstanding			1,860,646	1,995,745
Restricted Stock Award
Earnings Per Share Basic [Line Items]
Shares outstanding			448,857	288,560

Earnings per Share - Schedule o

Earnings per Share - Schedule of Calculation of Basic and Diluted Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended						6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019
Earnings Per Share [Abstract]
Net income	$ 9,139	$ 2,966	$ 15,852	$ 15,342	$ 13,211	$ 12,597	$ 12,105	$ 25,808
Dividends on preferred shares	195				195		391	391
Net income available to common stockholders	$ 8,944				$ 13,016		$ 11,714	$ 25,417
Weighted-average common stock outstanding:
Weighted-average common stock outstanding (basic)	37,919,480				37,263,352		37,931,406	36,719,436
Incremental shares	107,809				684,654		418,658	725,971
Weighted-average common stock outstanding (dilutive)	38,027,289				37,948,006		38,350,064	37,445,407
Basic earnings per common share	$ 0.24				$ 0.35		$ 0.31	$ 0.69
Diluted earnings per common share	$ 0.24				$ 0.34		$ 0.31	$ 0.68

Stockholders' Equity - Summary

Stockholders' Equity - Summary of Preferred and Common Stock (Details) - $ / shares	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019
Class Of Stock [Line Items]
Shares authorized	50,000		50,000
Shares issued	10,438		10,438
Shares outstanding	10,438		10,438
Common stock, voting par value	$ 0.01		$ 0.01
Common stock, voting shares authorized	150,000,000		150,000,000
Common stock, voting shares issued	38,506,703		38,256,500
Common stock, voting shares outstanding	38,388,217		38,256,500
Treasury shares	118,486	118,486
Series B 7.5% Fixed to Floating Non-Cumulative Perpetual Preferred Stock
Class Of Stock [Line Items]
Par value	$ 0.01		$ 0.01
Shares authorized	50,000		50,000
Shares issued	10,438		10,438
Shares outstanding	10,438		10,438

Stockholders' Equity - Summar_2

Stockholders' Equity - Summary of Preferred and Common Stock (Parenthetical) (Details)	6 Months Ended	12 Months Ended
	Jun. 30, 2020	Dec. 31, 2019
Series B 7.5% Fixed to Floating Non-Cumulative Perpetual Preferred Stock
Class Of Stock [Line Items]
Preferred stock, dividend rate, percentage	7.50%	7.50%

Stockholders' Equity - Addition

Stockholders' Equity - Additional Information (Details) - USD ($)	Jun. 11, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2016	Nov. 01, 2019
Class Of Stock [Line Items]
Dividends declared and paid						$ 391,000	$ 391,000
Aggregate number of shares authorized to repurchase									1,250,000
Approximate percentage of shares authorized to be repurchased		3.30%				3.30%
Treasury shares		118,486	118,486			118,486
Treasury shares, at cost		$ 1,668,000	$ 1,700,000			$ 1,668,000
Cash dividend declared	$ 0.03
Dividend payable date	Jul. 7, 2020
Dividends record date	Jun. 23, 2020
Dividends declared		1,152,000	$ 1,151,000	$ 1,148,000	$ 0
Series B Preferred Stock
Class Of Stock [Line Items]
Preferred stock, dividend rate, percentage								7.50%
Preferred stock, liquidation preference per share								$ 1,000
Preferred stock fixed dividend close date								Dec. 30, 2021
Preferred stock redemption price per share								$ 1,000
Dividends declared and paid		$ 196,000			$ 196,000	$ 391,000	$ 391,000
Series B Preferred Stock | Three-month LIBOR
Class Of Stock [Line Items]
Preferred stock, dividend rate, percentage								5.41%

Consolidated Statements of Ch_5

Consolidated Statements of Change in Accumulated Other Comprehensive Income (Loss) - Schedule of Consolidated Statements of Changes in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended						6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance	$ 762,667	$ 750,115	$ 735,866	$ 717,675	$ 668,749	$ 650,672	$ 750,115	$ 650,672
Cumulative-effect adjustment (ASU 2016-01)								(1,440)
Other comprehensive income (loss), net of tax	9,685	11,048	(1,661)	2,309	5,071	4,519	20,733	9,590
Ending balance	780,935	762,667	750,115	735,866	717,675	668,749	780,935	717,675
Unrealized Gains (Losses) on Cash Flow Hedges
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance		(366)		64		4,763	(366)	4,763
Other comprehensive income (loss), net of tax							31	(4,699)
Ending balance	(335)		(366)		64		(335)	64
Unrealized Gains (Losses) on Available-for-Sale Securities
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance		(334)		(1,412)		(14,261)	(334)	(14,261)
Cumulative-effect adjustment (ASU 2016-01)								(1,440)
Other comprehensive income (loss), net of tax							20,702	14,289
Ending balance	20,368		(334)		(1,412)		20,368	(1,412)
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance	10,348	(700)	961	(1,348)	(6,419)	(9,498)	(700)	(9,498)
Cumulative-effect adjustment (ASU 2016-01)						(1,440)
Other comprehensive income (loss), net of tax	9,685	11,048	(1,661)	2,309	5,071	4,519
Ending balance	$ 20,033	$ 10,348	$ (700)	$ 961	$ (1,348)	$ (6,419)	$ 20,033	$ (1,348)