FirstSun Capital Bancorp (FSUN) 10-Q 5 Nov 21 2021 Q3 Quarterly report Financial data

Cover

Cover - shares	9 Months Ended
	Sep. 30, 2021	Nov. 04, 2021
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2021
Document Transition Report	false
Entity File Number	333-258176
Entity Registrant Name	FIRSTSUN CAPITAL BANCORP
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	81-4552413
Entity Address, Address Line One	1400 16th Street
Entity Address, Address Line Two	Suite 250
Entity Address, City or Town	Denver
Entity Address, State or Province	CO
Entity Address, Postal Zip Code	80202
City Area Code	303
Local Phone Number	831-6704
Entity Current Reporting Status	No
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		18,321,659
Entity Central Index Key	0001709442
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q3
Amendment Flag	false
Current Fiscal Year End Date	--12-31

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Assets
Cash and cash equivalents	$ 949,541	$ 201,978
Securities available-for-sale	531,395	468,586
Securities held-to-maturity, fair value of $20,693 and $33,328, respectively	19,811	32,188
Loans held-for-sale, at fair value	122,217	193,963
Loans, net of allowance for loan losses of $47,868 and $47,766, respectively	3,756,113	3,798,591
Mortgage servicing rights, at fair value	43,971	29,144
Premises and equipment, net	54,094	56,758
Other real estate owned and foreclosed assets, net	5,747	3,354
Bank-owned life insurance	54,536	53,582
Restricted equity securities	16,927	23,175
Goodwill	33,050	33,050
Core deposits and other intangible assets, net	8,605	9,667
Accrued interest receivable	16,649	15,416
Deferred tax assets, net	21,457	23,763
Prepaid expenses and other assets	48,972	52,242
Total assets	5,683,085	4,995,457
Deposits:
Noninterest-bearing accounts	1,578,306	1,054,458
Interest-bearing accounts	3,279,679	3,099,091
Total deposits	4,857,985	4,153,549
Securities sold under agreements to repurchase	117,001	115,372
Federal Home Loan Bank advances	40,000	70,411
Convertible notes payable, net	19,256	18,696
Subordinated debt, net	49,928	49,666
Accrued interest payable	2,768	2,592
Accrued expenses and other liabilities	76,226	99,384
Total liabilities	5,163,164	4,509,670
Commitments and contingencies (Note 15)
Stockholders’ equity:
Preferred stock, $0.0001 par value, 10,000,000 shares authorized, none issued or outstanding, respectively	0	0
Common stock, $0.0001 par value; 50,000,000 shares authorized; 19,878,713 shares issued; 18,321,659 shares outstanding, respectively	2	2
Additional paid-in capital	260,864	259,363
Treasury stock, 1,557,054 shares, respectively	(38,148)	(38,148)
Retained earnings	289,798	255,451
Accumulated other comprehensive income, net	7,405	9,119
Total stockholders’ equity	519,921	485,787
Total liabilities and stockholders’ equity	$ 5,683,085	$ 4,995,457

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Statement of Financial Position [Abstract]
Securities held-to-maturity, fair value	$ 20,693	$ 33,328
Loans, allowance for loan losses	$ 47,868	$ 47,766
Preferred stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Preferred stock, shares authorized (in shares)	10,000,000	10,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Common stock, shares authorized (in shares)	50,000,000	50,000,000
Common stock, shares issued (in shares)	19,878,713	19,878,713
Common Stock, shares outstanding (in shares)	18,321,659	18,321,659
Treasury stock shares (in shares)	1,557,054	1,557,054

Consolidated Statements of Inco

Consolidated Statements of Income and Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Interest and fee income on loans:
Taxable	$ 37,225	$ 30,496	$ 102,068	$ 88,781
Tax exempt	3,471	6,255	16,612	17,696
Interest and dividend income on securities:
Taxable	1,949	2,097	5,634	8,229
Tax exempt	5	3	12	9
Other interest income	611	309	1,450	1,095
Total interest income	43,261	39,160	125,776	115,810
Interest expense:
Interest expense on deposits	1,978	3,348	6,731	12,881
Interest expense on securities sold under agreements to repurchase	13	23	49	139
Interest expense on other borrowed funds	1,305	1,451	4,214	3,634
Total interest expense	3,296	4,822	10,994	16,654
Net interest income	39,965	34,338	114,782	99,156
Provision for loan losses	3,500	4,800	1,750	15,100
Net interest income after provision for loan losses	36,465	29,538	113,032	84,056
Noninterest income:
Service charges on deposit accounts	3,471	2,428	8,659	7,042
Credit and debit card fees	2,472	2,107	7,140	5,865
Trust and investment advisory fees	1,974	1,282	5,871	3,222
Income from mortgage banking services, net	20,151	35,535	68,144	89,986
Gain on sales of available-for-sale securities, net	0	0	0	153
Gain on other real estate owned and foreclosed assets activity, net	93	443	591	242
Other noninterest income	523	924	4,443	2,604
Total noninterest income	28,684	42,719	94,848	109,114
Noninterest expense:
Salary and employee benefits	36,061	37,949	113,129	101,998
Occupancy and equipment	6,643	6,365	19,867	19,251
Amortization of intangible assets	354	371	1,062	1,093
Merger related expenses	705	0	1,984	0
Other noninterest expenses	10,807	9,688	30,332	26,796
Total noninterest expense	54,570	54,373	166,374	149,138
Income before income taxes	10,579	17,884	41,506	44,032
Provision for income taxes	1,851	3,130	7,159	7,707
Net income	8,728	14,754	34,347	36,325
Other comprehensive income:
Reclassification adjustment for net gain on sales of available-for-sale securities	0	0	0	(153)
Change in unrealized gain (loss) on available-for-sale securities	349	1,228	(2,270)	11,799
Income tax effect on other comprehensive income	(86)	(300)	556	(2,848)
Comprehensive income	8,991	15,682	32,633	45,123
Earnings per share:
Net income applicable to common stockholders, basic	8,728	14,754	34,347	36,325
Net income applicable to common stockholders, diluted	$ 8,728	$ 14,754	$ 34,347	$ 36,325
Basic (in dollars per share)	$ 0.48	$ 0.81	$ 1.87	$ 1.98
Diluted (in dollars per share)	$ 0.46	$ 0.81	$ 1.83	$ 1.98

Consolidated Statements of Stoc

Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common stock	Additional paid-in capital	Treasury stock	Retained earnings	Accumulated other comprehensive income
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, beginning of period (in shares)		19,878,713
Balance, end of period	$ 430,201	$ 2	$ 257,181	$ (36,706)	$ 207,866	$ 1,858
Balance, beginning of period at Sep. 30, 2020	475,481	$ 2	258,780	(38,148)	244,191	10,656
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of treasury stock	2			2
Repurchase of treasury stock	(1,564)			(1,564)
Stock option exercise	(33)		(153)	120
Share-based compensation, net of forfeitures	1,752		1,752
Net income	36,325				36,325
Other comprehensive income (loss)	8,798					8,798
Balance, end of period (in shares) at Sep. 30, 2020		19,878,713
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, beginning of period (in shares)		19,878,713
Balance, end of period	459,293	$ 2	258,315	(38,189)	229,437	9,728
Balance, beginning of period at Sep. 30, 2020	475,481	$ 2	258,780	(38,148)	244,191	10,656
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock option exercise	41			41
Share-based compensation, net of forfeitures	465		465
Net income	14,754				14,754
Other comprehensive income (loss)	928					928
Balance, end of period (in shares) at Sep. 30, 2020		19,878,713
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, beginning of period (in shares)		19,878,713
Balance, end of period	475,481	$ 2	258,780	(38,148)	244,191	10,656
Balance, beginning of period (in shares)		19,878,713
Balance, end of period	485,787	$ 2	259,363	(38,148)	255,451	9,119
Balance, beginning of period at Sep. 30, 2021	519,921	$ 2	260,864	(38,148)	289,798	7,405
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation, net of forfeitures	1,501		1,501
Net income	34,347				34,347
Other comprehensive income (loss)	(1,714)					(1,714)
Balance, end of period (in shares) at Sep. 30, 2021		19,878,713
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, beginning of period (in shares)		19,878,713
Balance, end of period	510,582	$ 2	260,516	(38,148)	281,070	7,142
Balance, beginning of period at Sep. 30, 2021	519,921	$ 2	260,864	(38,148)	289,798	7,405
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation, net of forfeitures	348		348
Net income	8,728				8,728
Other comprehensive income (loss)	263					263
Balance, end of period (in shares) at Sep. 30, 2021		19,878,713
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, beginning of period (in shares)		19,878,713
Balance, end of period	$ 519,921	$ 2	$ 260,864	$ (38,148)	$ 289,798	$ 7,405

Consolidated Statements of St_2

Consolidated Statements of Stockholders' Equity (Parentheticals)	9 Months Ended
	Sep. 30, 2020shares
Statement of Stockholders' Equity [Abstract]
Issuance of treasury stock (in shares)	100
Repurchase of treasury stock (in shares)	63,844
Stock option exercise (in shares)	4,892

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Cash flows from operating activities:
Net income	$ 34,347	$ 36,325
Adjustments to reconcile income to net cash provided by operating activities:
Provision for loan losses	1,750	15,100
Depreciation	4,716	4,353
Deferred tax (benefit) expense	2,862	1
Accretion of net discount on securities	2,617	3,164
Net accretion of discount on acquired loans	(1,001)	(2,709)
Net change in deferred loan origination fees and costs	(407)	9,442
Amortization of core deposits and other intangible assets	1,062	1,093
Net amortization of lease marks	0	83
Amortization of software implementation costs	844	731
Accretion of fair value premium on acquired deposits	(45)	(124)
Amortization of fair value discount on subordinated debt	192	192
Amortization of issuance costs on subordinated debt	70	23
Amortization of fair value discount on convertible notes payable	559	564
Accretion of fair value premium on Federal Home Loan Bank advances	0	(165)
Increase in cash surrender value of bank-owned life insurance	(954)	(959)
Impairment of premises and equipment	23	0
Impairment of other real estate owned and foreclosed assets	240	246
Federal Home Loan Bank stock dividends	(306)	(298)
Share-based compensation expense	1,501	1,752
(Increase) decrease in fair value of mortgage servicing rights	3,706	19,077
Net gain on sales of available-for-sale securities	0	(153)
Net gain on sales of loans held-for-investment	698	1,094
Net loss (gain) on disposal of premises and equipment	75	212
Net (gain) loss on other real estate owned and foreclosed assets activity	(591)	(242)
Net gain on sales of loans held-for-sale	(50,224)	(49,069)
Origination of loans held-for-sale	(1,693,782)	(1,767,009)
Proceeds from sales of loans held-for-sale	1,797,219	1,746,030
Changes in operating assets and liabilities:
Accrued interest receivable	(1,233)	(5,149)
Prepaid expenses and other assets	2,231	(19,329)
Accrued interest payable	176	948
Accrued expenses and other liabilities	(23,610)	30,393
Net cash provided by operating activities	82,735	25,617
Cash flows from investing activities:
Net cash paid for acquisitions	0	(7,019)
Proceeds from maturities of held-to-maturity securities	12,097	16,827
Purchases of available-for-sale securities	(164,914)	(72,700)
Proceeds from sale or maturities of available-for-sale securities	97,499	151,144
Loan originations, net of repayments	19,632	(815,040)
Proceeds from the sale of loans held-for-sale previously classified as held-for-investment	18,544	97,832
Purchases of premises and equipment	(2,891)	(4,348)
Proceeds from the sale of premises and equipment	1,192	1,161
Proceeds from sales of other real estate owned and foreclosed assets	1,221	6,296
Purchases of restricted equity securities	(49)	(8,689)
Proceeds from the sale or redemption of restricted equity securities	6,603	298
Purchase of other investments	(324)	(122)
Proceeds from the sale or redemption of other investments	519	1
Net cash provided by (used in) investing activities	(10,871)	(634,359)
Cash flows from financing activities:
Net change in deposits	704,481	409,103
Net change in securities sold under agreements to repurchase	1,629	63,140
Proceeds from Federal Home Loan Bank advances	0	1,019,000
Repayments of Federal Home Loan Bank advances	(30,411)	(897,998)
Repayments of other borrowings	0	(6,000)
Proceeds from Subordinated debt	0	39,067
Issuance of treasury stock	0	(31)
Purchase of treasury stock	0	(1,564)
Net cash provided by financing activities	675,699	624,717
Net increase in cash and cash equivalents	747,563	15,975
Cash and cash equivalents, beginning of period	201,978	144,531
Cash and cash equivalents, end of period	949,541	160,506
Supplemental disclosures of cash flow information:
Interest paid on deposits	6,869	13,564
Interest paid on borrowed funds	4,362	4,119
Cash paid for income taxes, net	4,930	8,003
Non-cash investing and financing activities:
Net change in unrealized gain on available-for-sale securities	(2,270)	11,646
Loan charge-offs	3,242	1,785
Loans transferred to other real estate owned and foreclosed assets	3,264	3,110
Mortgage servicing rights resulting from sale or securitization of mortgage loans	$ 18,533	$ 15,879

Organization and Basis of Prese

Organization and Basis of Presentation	9 Months Ended
	Sep. 30, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization and Basis of Presentation	Organization and Basis of Presentation Nature of Operations - The consolidated financial statements include the accounts of FirstSun Capital Bancorp (“FirstSun” or “Parent Company” and its wholly-owned subsidiaries, Sunflower Bank, N.A. (the “Bank”) and Logia Portfolio Management, LLC, and have been prepared using U.S. generally accepted accounting principles (“U.S. GAAP”) for interim financial statements. All significant intercompany balances and transactions have been eliminated in consolidation. These entities are collectively referred to as “our”, “us”, “we”, or “the Company”. These consolidated financial statements do not include all of the information and footnotes required by U.S. GAAP for a full year presentation and certain disclosures have been condensed or omitted in accordance with rules and regulations of the SEC. These interim financial statements are unaudited, and include, in our opinion, all adjustments necessary for a fair statement of the results for the periods indicated, which are not necessarily indicative of results which may be expected for the full year. These unaudited consolidated financial statements and notes should be read in conjunction with FirstSun’s audited consolidated financial statements and footnotes thereto for the year ended December 31, 2020 included in our proxy statement/prospectus dated August 10, 2021 (the “Prospectus”) filed with the SEC on August 12, 2021, pursuant to Securities Act Rule 424(b)(3) in connection with our proposed merger with Pioneer Bancshares, Inc. (“Pioneer”). Certain prior period amounts have been reclassified to conform to the current period presentation. Reclassifications had no effect on our net income or stockholders’ equity. Business Combination - On May 11, 2021, FirstSun and Pioneer entered into an Agreement and Plan of Merger that provides for the merger of Pioneer with and into FirstSun, with FirstSun as the surviving entity (the “merger”). If the merger is completed, each share of Pioneer common stock will be converted into the right to receive 1.0443 shares of FirstSun common stock plus cash in lieu of any fractional shares. In September 2021, the Pioneer stockholders approved the merger. Completion of the merger, among other things, is subject to the requisite approval of the appropriate regulatory bodies, and if approved is expected to close in the fourth quarter of 2021. Pioneer currently operates from its headquarters in Austin, Texas and has banking offices located primarily in the Austin, Houston, San Antonio, and Dallas metro areas. As of September 30, 2021 Pioneer had assets of $1.6 billion, total loans of $1.0 billion, and deposits of $1.3 billion. Use of Estimates - The preparation of consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions based on available information. These estimates and assumptions affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. These estimates are based on historical experience and on various assumptions about the future that are believed to be reasonable based on all available information. Our reported financial position or results of operations may be materially different under changed conditions or when using different estimates and assumptions, particularly with respect to significant accounting policies. In the event that estimates or assumptions prove to differ from actual results, adjustments are made in subsequent periods to reflect more current information. Risks and Uncertainties - In the normal course of business, companies in the banking and mortgage industries encounter certain economic and regulatory risks. Economic risks include prepayment risk, market risk, interest rate risk, and credit risk. We are subject to interest rate risk to the extent that in a rising interest rate environment, we may experience a decrease in loan production, as well as decreases in the value of mortgage loans held-for-sale and in commitments to originate loans, which may adversely impact our earnings. Credit risk is the risk of default that may result from the borrowers’ inability or unwillingness to make contractually required payments. We generally sell loans to investors without recourse; therefore, the investors have assumed the risk of loss or default by the borrower. However, we are usually required by these investors to make certain standard representations and warranties relating to credit information, loan documentation, and collateral. To the extent that we do not comply with such representations, or there are early payment defaults, we may be required to repurchase the loans or indemnify these investors for any losses from borrower defaults. In addition, if loans pay off within a specified time frame, we may be required to refund a portion of the sales proceeds to the investors. We established reserves for potential losses related to these representations and warranties which is recorded within accrued expenses and other liabilities. In assessing the adequacy of the reserve, we evaluate various factors including actual write-offs during the period, historical loss experience, known delinquent and other problem loans, and economic trends and conditions in the industry. Further information is presented in Note 15. Commitments and Contingencies . Adoption of New Accounting Standards - As an “emerging growth company” under Section 107 of the JOBS Act, we can take advantage of the extended transition period provided in Section 7(a)(2)(B) of the Securities Act for complying with new or revised accounting standards. Therefore, we can delay the adoption of certain accounting standards until those standards would otherwise apply to non-public business entities. We intend to take advantage of the benefits of this extended transition period for an “emerging growth company” for as long as it is available to us. For standards that we have delayed adoption, we may lack comparability to other companies who have adopted such standards. There have been no material developments with respect to newly issued standards from those disclosed in our Prospectus. We have deferred adoption of ASU 2016-02, Leases (Topic 842) and ASU 2016-13, Financial Instruments - Credit Losses (Topic 326) .

Securities

Securities	9 Months Ended
	Sep. 30, 2021
Investments, Debt and Equity Securities [Abstract]
Securities	Securities The amortized cost, gross unrealized gains and losses, and fair values of available-for-sale and held-to-maturity debt securities by type follows: Amortized Gross Gross Estimated As of September 30, 2021 Available-for-sale: U.S. treasury $ 20,454 $ 241 $ — $ 20,695 U.S. agency 6,493 — (104) 6,389 Obligations of states and political subdivisions 3,981 16 — 3,997 Mortgage backed - residential 132,062 2,998 (779) 134,281 Collateralized mortgage obligations 219,671 2,521 (31) 222,161 Mortgage backed - commercial 138,932 4,959 (19) 143,872 Total available-for-sale $ 521,593 $ 10,735 $ (933) $ 531,395 Held-to-maturity: Obligations of states and political subdivisions $ 720 $ 30 $ — $ 750 Mortgage backed - residential 11,686 545 — 12,231 Collateralized mortgage obligations 7,405 307 — 7,712 Total held-to-maturity $ 19,811 $ 882 $ — $ 20,693 As of December 31, 2020 Available-for-sale: U.S. agency $ 9,204 $ — $ (208) $ 8,996 Obligations of states and political subdivisions 3,427 8 — 3,435 Mortgage backed - residential 116,365 3,399 (202) 119,562 Collateralized mortgage obligations 200,496 2,743 (43) 203,196 Mortgage backed - commercial 127,022 6,426 (51) 133,397 Total available-for-sale $ 456,514 $ 12,576 $ (504) $ 468,586 Held-to-maturity: U.S. agency $ 5,099 $ 26 $ — $ 5,125 Obligations of states and political subdivisions 730 41 — 771 Mortgage backed - residential 16,050 618 — 16,668 Collateralized mortgage obligations 10,309 455 — 10,764 Total held-to-maturity $ 32,188 $ 1,140 $ — $ 33,328 As of September 30, 2021 and December 31, 2020, there were no holdings of securities of any one issuer, other than the U.S. Government and its agencies, in an amount greater than 10% of stockholders’ equity. Certain debt securities that have gross unrealized losses and have been in a continuous unrealized loss position for more than one year follows: Less than 12 months 12 months or longer Total Estimated Unrealized Estimated Unrealized Estimated Unrealized Number As of September 30, 2021 Available-for-sale: U.S. agency $ — $ — $ 6,389 $ (104) $ 6,389 $ (104) 7 Mortgage backed - residential 36,034 (769) 2,896 (10) 38,930 (779) 9 Collateralized mortgage obligations 13,024 (27) 610 (4) 13,634 (31) 8 Mortgage backed - commercial — — 24,170 (19) 24,170 (19) 2 Total available-for-sale $ 49,058 $ (796) $ 34,065 $ (137) $ 83,123 $ (933) 26 Less than 12 months 12 months or longer Total Estimated Unrealized Estimated Unrealized Estimated Unrealized Number As of December 31, 2020 Available-for-sale: U.S. agency $ — $ — $ 8,996 $ (208) $ 8,996 $ (208) 7 Mortgage backed - residential 15,251 (146) 7,601 (56) 22,852 (202) 8 Collateralized mortgage obligations 23,646 (43) — — 23,646 (43) 11 Mortgage backed - commercial 9,167 (15) 14,971 (36) 24,138 (51) 2 Total available-for-sale $ 48,064 $ (204) $ 31,568 $ (300) $ 79,632 $ (504) 28 There were no held-to-maturity securities in an unrealized loss position as of September 30, 2021 or December 31, 2020. Estimated fair value is less than amortized cost primarily because of general economic conditions unrelated to the specific issuer. At September 30, 2021 and December 31, 2020, management does not believe these securities are other than temporarily impaired for the following reasons: no significant deterioration in the earnings performance, credit rating, asset quality, or business prospects of the issuer; no significant adverse change in the regulatory, economic, or technological environment of the issuer; and no significant adverse change in the general market condition of either the geographic area or the industry in which the issuer operates. Management has the ability and intends to hold these securities and it is likely that management will not be required to sell the securities prior to maturity or until such time as the full amount of investment principal will be returned. The amortized cost and fair value of our debt securities by contractual maturity as of September 30, 2021 are summarized in the following table. Maturities are based on the final contractual payment dates and do not reflect the impact of prepayments or earlier redemptions that may occur. Amortized Estimated Available-for-sale: Due within 1 year $ 66 $ 67 Due after 1 year through 5 years 20,442 21,008 Due after 5 years through 10 years 135,566 138,722 Due after 10 years 365,519 371,598 Total available-for-sale $ 521,593 $ 531,395 Held-to-maturity: Due after 1 year through 5 years $ 720 $ 750 Due after 5 years through 10 years 702 749 Due after 10 years 18,389 19,194 Total held-to-maturity $ 19,811 $ 20,693 Securities with a carrying value of $466,982 and $437,223 were pledged to secure public deposits, securities sold under agreements to repurchase and borrowed funds at September 30, 2021 and December 31, 2020, respectively.

Loans

Loans	9 Months Ended
	Sep. 30, 2021
Receivables [Abstract]
Loans	Loans Loans held-for-investment consist of the following: September 30, 2021 December 31, 2020 Commercial $ 2,228,639 $ 2,181,552 Commercial real estate 1,140,181 1,156,668 Residential real estate 426,044 503,828 Consumer 17,742 14,233 Total loans 3,812,606 3,856,281 Deferred costs, fees, premiums, and discounts (8,625) (9,924) Allowance for loan losses (47,868) (47,766) Total loans, net $ 3,756,113 $ 3,798,591 On March 27, 2020, the Coronavirus Aid, Relief and Economic Security Act (the “CARES Act”) was signed into law. A provision in the CARES Act created the Paycheck Protection Program (PPP), a program administered by the Small Business Administration (“SBA”) to provide loans to small business during the COVID-19 pandemic. As of September 30, 2021 and December 31, 2020, we had $116,519 and $256,336 of PPP loans outstanding and deferred processing fees outstanding of $3,153 and $5,235, respectively. PPP loans are classified as Commercial loans in the consolidated financial statements. No allowance for loan losses has been recognized for PPP loans as such loans are fully guaranteed by the SBA. The following table presents the activity in the allowance for loan losses by portfolio type for the three months ended September 30,: Commercial Commercial Residential Consumer Total 2021 Allowance for loan losses: Balance, beginning of period $ 28,173 $ 13,149 $ 1,305 $ 351 $ 42,978 Provision for (benefit from) loan losses 3,030 560 (31) (59) 3,500 Loans charged off — — — (66) (66) Recoveries 1,440 — 3 13 1,456 Balance, end of period $ 32,643 $ 13,709 $ 1,277 $ 239 $ 47,868 2020 Allowance for loan losses: Balance, beginning of period $ 22,541 $ 13,212 $ 1,868 $ 275 $ 37,896 Provision for (benefit from) loan losses 4,030 853 (126) 43 4,800 Loans charged off (203) (1) — (32) (236) Recoveries 225 — 3 13 241 Balance, end of period $ 26,593 $ 14,064 $ 1,745 $ 299 $ 42,701 The following table presents the activity in the allowance for loan losses by portfolio type for the nine months ended September 30,: Commercial Commercial Residential Consumer Total 2021 Allowance for loan losses: Balance, beginning of period $ 32,009 $ 13,863 $ 1,606 $ 288 $ 47,766 Provision for (benefit from) loan losses 2,210 (163) (350) 53 1,750 Loans charged off (3,102) — (2) (138) (3,242) Recoveries 1,526 9 23 36 1,594 Balance, end of period $ 32,643 $ 13,709 $ 1,277 $ 239 $ 47,868 2020 Allowance for loan losses: Balance, beginning of period $ 17,509 $ 9,645 $ 1,056 $ 336 $ 28,546 Provision for loan losses 9,567 4,728 708 97 15,100 Loans charged off (997) (581) (39) (168) (1,785) Recoveries 514 272 20 34 840 Balance, end of period $ 26,593 $ 14,064 $ 1,745 $ 299 $ 42,701 We determine the allowance for loan losses estimate on at least a quarterly basis. The following table presents the balance in the allowance for loan losses and the recorded investment by portfolio type based on impairment method: Commercial Commercial Residential Consumer Total As of September 30, 2021 Loans: Individually evaluated for impairment $ 19,632 $ 5,203 $ 6,555 $ 3 $ 31,393 Collectively evaluated for impairment 2,209,007 1,134,978 419,489 17,739 3,781,213 Total loans $ 2,228,639 $ 1,140,181 $ 426,044 $ 17,742 $ 3,812,606 Allowance for loan losses: Individually evaluated for impairment $ 3,823 $ 387 $ 148 $ — $ 4,358 Collectively evaluated for impairment 28,820 13,322 1,129 239 43,510 Total allowance for loan losses $ 32,643 $ 13,709 $ 1,277 $ 239 $ 47,868 As of December 31, 2020 Loans: Individually evaluated for impairment $ 23,197 $ 2,933 $ 9,630 $ 38 $ 35,798 Collectively evaluated for impairment 2,158,355 1,153,735 494,198 14,195 3,820,483 Total loans $ 2,181,552 $ 1,156,668 $ 503,828 $ 14,233 $ 3,856,281 Allowance for loan losses: Individually evaluated for impairment $ 3,972 $ 12 $ 96 $ — $ 4,080 Collectively evaluated for impairment 28,037 13,851 1,510 288 43,686 Total allowance for loan losses $ 32,009 $ 13,863 $ 1,606 $ 288 $ 47,766 The following table presents information related to impaired loans by class of loans as of: Unpaid Recorded Allowance for Average As of September 30, 2021 With no related allowance recorded: Commercial $ 10,013 $ 9,505 $ — $ 6,964 Commercial real estate 2,365 2,307 — 2,201 Residential real estate 4,717 4,732 — 3,153 Consumer 4 3 — 4 Total loans with no related allowance recorded 17,099 16,547 — 12,322 With an allowance recorded: Commercial 10,386 10,127 3,823 6,962 Commercial real estate 2,949 2,896 387 1,940 Residential real estate 1,794 1,823 148 1,224 Total loans an allowance recorded 15,129 14,846 4,358 10,126 Total impaired loans $ 32,228 $ 31,393 $ 4,358 $ 22,448 As of December 31, 2020 With no related allowance recorded: Commercial $ 16,370 $ 15,756 $ — $ 12,189 Commercial real estate 2,850 2,838 — 1,910 Residential real estate 9,021 8,933 — 5,855 Consumer 38 38 — 29 Total loans with no related allowance recorded 28,279 27,565 — 19,983 With an allowance recorded: Commercial 7,610 7,441 3,972 5,304 Commercial real estate 133 95 12 67 Residential real estate 709 697 96 479 Total loans an allowance recorded 8,452 8,233 4,080 5,850 Total impaired loans $ 36,731 $ 35,798 $ 4,080 $ 25,833 Interest income recorded on impaired loans was not material for the three and nine months ended September 30, 2021 and 2020. Credit risk monitoring and management is a continuous process to manage the quality of the loan portfolio. We categorize loans into risk categories based on relevant information about the ability of borrowers to service their debt including current financial information, historical payment experience, credit documentation, public information and current economic trends among other factors. The risk rating system is used as a tool to analyze and monitor loan portfolio quality. Risk ratings meeting an internally specified exposure threshold are updated annually, or more frequently upon the occurrence of a circumstance that affects the credit risk of the loan. We use the following definitions for risk ratings: Substandard - loans are considered “classified” and have a well-defined weakness, or weaknesses, such as loans that are inadequately protected by the current net worth and paying capacity of the obligor or of the collateral pledged, if any. Substandard loans are also characterized by the distinct possibility of loss in the future if the deficiencies are not corrected. Doubtful - loans are considered “classified” and have all the weaknesses inherent in those classified as Substandard, with the added characteristic that the weaknesses make collection or liquidation in full, on the basis of currently existing facts, conditions and values, highly questionable and improbable. There were no loans categorized as doubtful as of September 30, 2021 and December 31, 2020. Loans not meeting the criteria above that are analyzed individually as part of the above described process are considered to be pass-rated loans. The following table presents the credit risk profile of our loan portfolio based on our rating categories: Non-Classified Classified Total As of September 30, 2021 Commercial $ 2,202,979 $ 25,660 $ 2,228,639 Commercial real estate 1,113,753 26,428 1,140,181 Residential real estate 419,557 6,487 426,044 Consumer 17,736 6 17,742 Total loans $ 3,754,025 $ 58,581 $ 3,812,606 As of December 31, 2020 Commercial $ 2,145,831 $ 35,721 $ 2,181,552 Commercial real estate 1,126,080 30,588 1,156,668 Residential real estate 494,155 9,673 503,828 Consumer 14,195 38 14,233 Total loans $ 3,780,261 $ 76,020 $ 3,856,281 The following table presents our loan portfolio aging analysis: Loans Loans Loans Loans Greater Non-Accrual Total As of September 30, 2021 Commercial $ 2,208,361 $ 1,639 $ — $ — $ 18,639 $ 2,228,639 Commercial 1,123,875 9,420 1,681 — 5,205 1,140,181 Residential 418,746 — 842 — 6,456 426,044 Consumer 17,721 18 — — 3 17,742 Total loans $ 3,768,703 $ 11,077 $ 2,523 $ — $ 30,303 $ 3,812,606 As of December 31, 2020 Commercial $ 2,147,310 $ 11,415 $ 48 $ — $ 22,779 $ 2,181,552 Commercial 1,144,801 8,933 — — 2,934 1,156,668 Residential 489,482 2,948 1,123 777 9,498 503,828 Consumer 14,187 8 — — 38 14,233 Total loans $ 3,795,780 $ 23,304 $ 1,171 $ 777 $ 35,249 $ 3,856,281 As of September 30, 2021 and December 31, 2020, we have a recorded investment in troubled debt restructurings (TDRs) of $18,750 and $13,975, respectively. We have no commitments to lend additional amounts at September 30, 2021. The modification of the terms of the loans performed for the nine months ended September 30, 2021 and for the year ended December 31, 2020 respectively, included rate modifications, extensions of the maturity dates or a permanent reduction of the recorded investment in the loans. The following table presents loans by class modified as TDRs that occurred during the nine months ended September 30, 2021 and year ended December 31, 2020: Number Pre-Modification Post-Modification September 30, 2021 Commercial 5 $ 6,789 $ 5,229 Total 5 $ 6,789 $ 5,229 December 31, 2020 Commercial 11 $ 2,950 $ 2,831 Residential real estate 5 917 907 Total 16 $ 3,867 $ 3,738 For the nine months ended September 30, 2021 and year ended December 31, 2020 the TDRs described above increased the allowance for loan losses by $1,441 and $1,464, respectively. There were no amounts charged-off during the nine months ended September 30, 2021 and year ended December 31, 2020. For the year ended December 31, 2020, there were loans modified as TDRs totaling $1,759 for which there was a payment default following the modification. In order to assess whether a borrower is experiencing financial difficulty, an evaluation is performed to determine the probability that the borrower will be in payment default on any of its debt in the foreseeable future without the modification. This evaluation is performed under our internal underwriting policy. A loan is generally considered to be in payment default once it is 30 days contractually past due under the modified terms. We are working with borrowers impacted by COVID-19 and providing modifications to include interest only deferral or principal and interest deferral. These modifications are excluded from TDR classification under Section 4013 of the CARES Act or under applicable interagency guidance of the federal banking regulators. As of September 30, 2021, we had actively modified loans under the CARES Act as follows: Number Recorded September 30, 2021 Residential real estate 9 $ 2,517 Acquired Loans and Loan Discounts : Included in the net loan portfolio as of September 30, 2021 and December 31, 2020 is a net accretable discount related to loans acquired within a business combination in the approximate amounts of $770 and $2,043, respectively. The discount is accreted into income on a level-yield basis over the life of the loans. Loans acquired with evidence of credit quality deterioration at acquisition, for which it was probable that we would not be able to collect all contractual amounts due, were accounted for as purchased credit impaired (“PCI”) loans. The outstanding balance represents the total amount owed, including accrued but unpaid interest, and any amounts previously charged off. The carrying amount of purchased credit impaired loans is not significant as of September 30, 2021 and December 31, 2020.

Mortgage Servicing Rights

Mortgage Servicing Rights	9 Months Ended
	Sep. 30, 2021
Transfers and Servicing [Abstract]
Mortgage Servicing Rights	Mortgage Servicing Rights We have investments in mortgage servicing rights (“MSRs”) that result from the sale of loans to the secondary market for which we retain the servicing. We account for these MSRs at their fair value. A primary risk associated with MSRs is the potential reduction in fair value as a result of higher than anticipated prepayments due to loan refinancing prompted, in part, by declining interest rates or government intervention. Conversely, these assets generally increase in value in a rising interest rate environment to the extent that prepayments are slower than anticipated. We utilize derivatives as economic hedges to offset changes in the fair value of the MSRs resulting from the actual or anticipated changes in prepayments stemming from changing interest rate environments. The unpaid principal loan balance of our servicing portfolio is presented in the following table as of: September 30, 2021 December 31, 2020 Federal National Mortgage Association $ 2,278,202 $ 2,117,703 Federal Home Loan Mortgage Corporation 1,425,824 948,934 Government National Mortgage Association 757,859 722,138 Federal Home Loan Bank 148,214 245,246 Other 1,948 2,144 Total $ 4,612,047 $ 4,036,165 The activity of MSRs carried at fair value is as follows: For the three months ended September 30, For the nine months ended September 30, 2021 2020 2021 2020 Balance, beginning of period $ 40,844 $ 23,800 $ 29,144 $ 29,003 Additions: Servicing resulting from transfers of financial assets 5,303 6,614 18,533 15,879 Changes in fair value: Due to changes in valuation inputs or assumptions used in the valuation model 948 (2,114) 5,209 (13,215) Changes in fair value due to pay-offs, pay-downs, and runoff (3,124) (2,495) (8,915) (5,862) Balance, end of period $ 43,971 $ 25,805 $ 43,971 $ 25,805 The following represents the weighted-average key assumptions used to estimate the fair value of MSRs as of: September 30, 2021 December 31, 2020 September 30, 2020 Discount rate 9.22 % 9.12 % 9.28 % Total prepayment speeds 12.15 % 16.99 % 18.79 % Cost of servicing each loan $86/per loan $85/per loan $86/per loan Total servicing and ancillary fees earned from the mortgage servicing portfolio is presented in the following table: For the three months ended September 30, For the nine months ended September 30, 2021 2020 2021 2020 Servicing fees $ 3,101 $ 2,400 $ 8,853 $ 6,773 Late and ancillary fees 118 92 317 277 Total $ 3,219 $ 2,492 $ 9,170 $ 7,050

Derivative Financial Instrument

Derivative Financial Instruments	9 Months Ended
	Sep. 30, 2021
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Financial Instruments	Derivative Financial Instruments Banking Derivative Financial Instruments : We are exposed to changes in the fair value of certain of our fixed-rate assets due to changes in benchmark interest rates. We use interest rate swaps to manage our exposure to changes in fair value on these instruments attributable to changes in the designated benchmark interest rate, LIBOR. Interest rate swaps designated as fair value hedges involve the receipt of fixed-rate amounts from a counterparty in exchange for us making variable-rate payments over the life of the agreements without the exchange of the underlying notional amount. The carrying amount of hedged loans receivable as of September 30, 2021 and December 31, 2020 was $209,552 and $239,591, respectively. The cumulative amount of fair value hedging adjustment included in the carrying amount of the hedged loans receivable as of September 30, 2021 and December 31, 2020 was $7,784 and $14,906, respectively. The hedges were determined to be effective during all periods presented and we expect the hedges to remain effective during their remaining terms. Derivatives not designated as hedges are not speculative and result from a service we provide to certain customers. We execute interest rate swaps with banking customers to facilitate their respective risk management strategies. Those interest rate swaps are simultaneously hedged by offsetting derivatives that we execute with a third party, such that we minimize our net risk exposure resulting from such transactions. As the interest rate derivatives associated with this program do not meet the strict hedge accounting requirements, changes in the fair value of both the customer derivatives and the offsetting derivatives are recognized directly in earnings. These instruments are a component of prepaid expenses and other assets and accrued expenses and other liabilities. The components of our banking derivative financial instruments consisted of the following: Number of Expiration Outstanding Estimated September 30, 2021 Derivative financial instruments designated as hedging instruments: Assets: Interest Rate Products 1 2029 $ 20,378 $ 1,142 Liabilities: Interest Rate Products 12 2022-2029 $ 181,390 $ 8,898 Derivative financial instruments not designated as hedging instruments: Assets: Interest Rate Products 38 2024-2036 $ 207,937 $ 8,471 Liabilities: Interest Rate Products 38 2024-2036 $ 207,937 $ 8,810 December 31, 2020 Derivative financial instruments designated as hedging instruments: Assets: Interest Rate Products 2 2026-2029 $ 38,978 $ 830 Liabilities: Interest Rate Products 12 2022-2028 $ 185,637 $ 15,792 Derivative financial instruments not designated as hedging instruments: Assets: Interest Rate Products 28 2024-2031 $ 171,609 $ 11,348 Liabilities: Interest Rate Products 28 2024-2031 $ 171,609 $ 12,117 We recorded gains and losses on banking derivatives assets as follows: For the three months ended September 30, For the nine months ended September 30, 2021 2020 2021 2020 Recorded (loss) gain on banking derivative $ (186) $ (221) $ (420) $ 8,608 Recorded gain (loss) on banking derivative liabilities $ 337 $ 123 $ 926 $ (9,432) For the three months ended September 30, 2021 and 2020, our banking derivative financial instruments not designated as hedging instruments generated fee income of $246 and $1,406, respectively. For the nine months ended September 30, 2021 and 2020, our banking derivative financial instruments not designated as hedging instruments generated fee income of $1,080 and $2,967, respectively. Credit-risk-related Contingent Features : We have agreements with each of our derivative counterparties that contain a provision where if we either default or are capable of being declared in default on any of our indebtedness, then we could also be declared in default on our derivative obligations. We also have agreements with our derivative counterparties that contain a provision where if we fail to maintain our status as a well-capitalized institution, then our derivative counterparties have the right but not the obligation to terminate existing swaps. As of September 30, 2021 and December 31, 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 $18,435 and $28,622, respectively. As of September 30, 2021 and December 31, 2020, we have minimum collateral posting thresholds with our derivative counterparties and have posted collateral of $22,342 and $31,400, respectively. If we had breached any of these provisions at September 30, 2021, we could have been required to settle our obligations under the agreements at their termination value of $18,435. Mortgage Banking Derivative Financial Instruments : The components of our mortgage banking derivative financial instruments consisted of the following: Expiration Outstanding Estimated September 30, 2021 Derivative financial instruments Assets: Forward MBS trades 2021 $ 257,900 $ 987 Interest rate lock commitments (IRLC) 2021 $ 188,714 $ 1,420 Liabilities: Forward MBS trades 2021 $ 150,900 $ 2,258 December 31, 2020 Derivative financial instruments Assets: Forward MBS trades 2021 $ 189,900 $ 468 Interest rate lock commitments (IRLC) 2021 $ 462,394 $ 5,686 Liabilities: Forward MBS trades 2021 $ 433,400 $ 2,883 We recorded gains and losses on mortgage banking derivatives assets as follows: For the three months ended September 30, For the nine months ended September 30, 2021 2020 2021 2020 Recorded gain (loss) on mortgage banking derivative assets $ 9,175 $ (19,987) $ (302) $ 7,638 Recorded (loss) gain on mortgage banking derivative liabilities $ (10,241) $ 1,925 $ (7,714) $ (989)

Deposits

Deposits	9 Months Ended
	Sep. 30, 2021
Statistical Disclosure for Banks [Abstract]
Deposits	Deposits The composition of our deposits is as follows: As of September 30, 2021 December 31, 2020 Noninterest-bearing demand deposit accounts $ 1,578,306 $ 1,054,458 Interest-bearing deposit accounts: Interest-bearing demand accounts 201,510 164,870 Savings accounts and money market accounts 2,711,417 2,472,965 NOW accounts 37,888 95,297 Certificate of deposit accounts: Less than $100 151,696 164,491 $100 through $250 104,864 113,006 Greater than $250 72,304 88,462 Total interest-bearing deposit accounts 3,279,679 3,099,091 Total deposits $ 4,857,985 $ 4,153,549 The following table summarizes the interest expense incurred on our deposits: For the three months ended September 30, For the nine months ended September 30, 2021 2020 2021 2020 Interest-bearing deposit accounts: Interest-bearing demand accounts $ 89 $ 97 $ 300 $ 331 Savings accounts and money market accounts 1,155 1,635 3,668 5,901 NOW accounts 50 183 336 471 Certificate of deposit accounts 684 1,433 2,427 6,178 Total interest-bearing deposit accounts $ 1,978 $ 3,348 $ 6,731 $ 12,881 The remaining maturity on certificate of deposit accounts as of September 30, 2021 is as follows: Remainder of 2021 $ 59,117 2022 184,563 2023 47,911 2024 14,637 2025 11,001 2026 7,474 Thereafter 4,161 Total certificate of deposit accounts $ 328,864

Securities Sold Under Agreement

Securities Sold Under Agreements to Repurchase	9 Months Ended
	Sep. 30, 2021
Carrying Value of Securities Sold under Repurchase Agreements and Deposits Received for Securities Loaned [Abstract]
Securities Sold Under Agreements to Repurchase	Securities Sold Under Agreements to Repurchase Information concerning securities sold under agreements to repurchase is as follows for the periods ended: September 30, 2021 December 31, 2020 Amount outstanding at period-end $ 117,001 $ 115,372 Average daily balance during the period $ 131,444 $ 118,706 Average interest rate during the period 0.05 % 0.15 % Maximum month-end balance during the period $ 160,865 $ 149,844 Weighted average interest rate at period-end 0.04 % 0.05 % At September 30, 2021 and December 31, 2020, such agreements were secured by investment and mortgage-related securities with an approximate carrying amount of $134,701 and $121,116, respectively. Pledged securities are maintained by safekeeping agents at the direction of the Bank. Our agreements to repurchase generally mature daily, and are considered to be in an overnight and continuous position.

Debt

Debt	9 Months Ended
	Sep. 30, 2021
Debt Disclosure [Abstract]
Debt	Debt FHLB advances : The following is a breakdown of our FHLB advances and other borrowings outstanding as of: September 30, 2021 December 31, 2020 Amount Rate Weighted Amount Rate Weighted Variable rate line-of-credit advance $ — N/A N/A $ 20,000 0.35% N/A Fixed rate term advances $ 40,000 0.91% - 2.59% 1.49% $ 50,411 0.91% - 4.13% 1.78% $ 40,000 $ 70,411 The advances were collateralized by $842,678 and $943,376 of loans pledged to the FHLB as collateral as of September 30, 2021 and December 31, 2020, respectively. Future maturities of our FHLB borrowings is as follows: 2022 $ 10,000 2025 20,000 Thereafter 10,000 Total $ 40,000 As of September 30, 2021 and December 31, 2020, the Bank had total borrowing capacity with the FHLB that is based on qualified collateral lending values of $675,641 and $702,540, respectively. Our additional borrowing availability with the FHLB at September 30, 2021 was $556,547. These borrowings can be in the form of additional term advances or a line-of-credit. FRB advances : We also had a $9,366 line-of-credit with the FRB. The agreement bears interest at the Fed Funds target rate plus 0.50% and is secured by municipal, agency, mortgage-related and corporate securities. The entire line was available at September 30, 2021. Other borrowings : We have lines-of-credit with certain other financial institutions totaling $95,000 as of September 30, 2021. No amounts were drawn on these lines-of-credit in 2021. Convertible Notes Payable : We have issued a total of $20,673 of convertible notes with a maturity date of August 31, 2023. The annual interest rate on these convertible notes is 3.29% with quarterly interest payments. With respect to conversion, each $1 (in thousands) principal amount of the convertible notes can be converted to 15.6717 shares of Parent Company common stock at any time until maturity. The convertible notes were originally recorded with a discount of $4,682. As of and for the periods ended September 30, 2021 and December 31, 2020, the debt discount on the convertible notes totaled $1,418 and $1,977, respectively. The related accretion for the three months ended September 30, 2021 and 2020 was $186 and $188, respectively. The related accretion for the nine months ended September 30, 2021 and 2020 was $559 and $564, respectively. Subordinated Debt : Subordinated Notes : In June and August 2020, we issued a total of $40,000 subordinated notes. The notes pay interest at a fixed rate of 6.00% through June 30, 2025 and subsequently, until maturity, pay interest at a floating rate of three month term SOFR plus 5.89% reset quarterly. Interest is payable on July 1 and January 1 of each year. Such notes are due on July 1, 2030. The notes are not redeemable within the first five years of issuance, except under certain very limited conditions. After five years, we may redeem the notes at our discretion. We incurred and capitalized $933 of costs related to the issuance of the subordinated notes. As of and for the three and nine months ended September 30, 2021, the amortization associated with the debt issuance costs totaled $23 and $70. Trust preferred securities : We have issued $9,279 in trust preferred securities through a special-purpose trust, New Mexico Banquest Capital Trust I (“NMBCT I”). In addition, we have issued $4,640 in trust preferred securities through a special purpose trust, New Mexico Banquest Capital Trust II (“NMBCT II”, and together with NMBCT I, collectively referred to as “NMBCT Trusts”). Interest is payable quarterly at a rate of three-month LIBOR plus 3.35% (3.50% and 3.66% as of September 30, 2021 and 2020, respectively) for the trust preferred securities issued through NMBCT I and at a rate of three-month LIBOR plus 2.00% (2.15% and 2.36% as of September 30, 2021 and 2020, respectively) for the trust preferred securities issued through NMBCT II. This subordinated debt of $13,919 was originally recorded at a discount of $4,293. As of and for the three months ended September 30, 2021 and 2020, accretion associated with the fair value discount totaled $63, respectively. As of and for the nine months ended September 30, 2021 and 2020, accretion associated with the fair value discount totaled $192, respectively. The Parent Company fully and unconditionally guarantees the obligations of the NMBCT Trusts on a subordinated basis. The trust preferred securities issued through the NMBCT Trusts are mandatorily redeemable upon the maturity of the debentures on December 19, 2032 and November 23, 2034, respectively, and are optionally redeemable, in part or in whole, by the Parent Company at each quarterly interest payment date. The Parent Company owns all of the outstanding common securities of the NMBCT Trusts, which have an aggregate liquidation valuation amount of $419 and is recorded in prepaid expenses and other assets on the consolidated balance sheet. The NMBCT Trusts are considered variable interest entities. Since the Parent Company is not the primary beneficiary of the NMBCT Trusts, the financial statements of the NMBCT Trusts are not included in our consolidated financial statements.

Earnings Per Share

Earnings Per Share	9 Months Ended
	Sep. 30, 2021
Earnings Per Share [Abstract]
Earnings Per Share	Earnings Per Share Basic earnings per share, excluding dilution, is computed by dividing earnings available to common stockholders’ by the weighted average number of shares of common stock outstanding during the period. Diluted earnings per share reflects the potential dilution that could occur if securities or other contracts to issue common stock were exercised and converted into common stock or resulted in the issuance of common stock that could then share in our earnings. The following table sets forth the computation of basic and diluted earnings per share of common stock: For the three months ended September 30, For the nine months ended September 30, 2021 2020 2021 2020 Net income applicable to common stockholders $ 8,728 $ 14,754 $ 34,347 $ 36,325 Weighted Average Shares Weighted average common shares outstanding 18,321,659 18,320,606 18,321,659 18,327,164 Effect of dilutive securities Stock-based awards 449,022 — 440,838 — Weighted average diluted common shares 18,770,681 18,320,606 18,762,497 18,327,164 Earnings per common share Basic earnings per common share $ 0.48 $ 0.81 $ 1.87 $ 1.98 Effect of dilutive securities Stock-based awards (0.02) — (0.04) — Diluted earnings per common share $ 0.46 $ 0.81 $ 1.83 $ 1.98 Convertible notes payable for 323,984 shares of common stock were not considered in computing diluted earnings per share for three and nine months ended September 30, 2021 and 2020 because they were antidilutive. Stock-based awards of 98,659 and 161,806 shares were antidilutive for the three and nine months ended September 30, 2020, respectively.

Stockholders' Equity

Stockholders' Equity	9 Months Ended
	Sep. 30, 2021
Share-based Payment Arrangement [Abstract]
Stockholders' Equity	Stockholders’ Equity Equity Incentive Plan : We have established the FirstSun Capital Bancorp 2017 Equity Incentive Plan (the Plan). The Plan provides for the grant of stock options, stock appreciation rights, restricted stock and other stock awards to its employees, directors and consultants for up to 1,977,292 shares of FirstSun common stock in the aggregate. A summary of stock option activity under the Plan as of September 30, 2021, and changes during the period then ended is presented below: Shares Weighted-Average Exercise Price, per Share Weighted-Average Remaining Contractual Term (years) For the nine months ended September 30, 2021 Outstanding, beginning of period 1,428,940 $ 19.97 Exercised — — Granted 26,336 32.54 Forfeited (42,376) 20.33 Outstanding, end of period 1,412,900 $ 20.19 6.46 Options vested or expected to vest 1,412,900 $ 20.19 Options exercisable, end of period 1,166,887 $ 19.89 6.13 For the three months ended September 30, 2021 and 2020, we recorded total compensation cost of $348 and $526, respectively related to the Plan. For the nine months ended September 30, 2021 and 2020, we recorded total compensation cost of $1,501 and $1,752, respectively, related to the Plan. At September 30, 2021, there was $1,390 of total unrecognized compensation cost related to non-vested stock options granted under the Plan. The unrecognized compensation cost at September 30, 2021 is expected to be recognized over the following 3.67 years. At September 30, 2021 and December 31, 2020, the intrinsic value of the stock options was $15,343 and $10,660, respectively.

Income Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2021
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The provision for income taxes in interim periods requires us to make a best estimate of the effective tax rate expected to be applicable for the full year, adjusted for any discrete items for the applicable period. This estimated effective tax rate is then applied to interim consolidated pre-tax operating income to determine the interim provision for income taxes. The following table presents our provision for income tax and effective tax provision rate: For the three months ended September 30, For the nine months ended September 30, 2021 2020 2021 2020 Provision for income taxes $ 1,851 $ 3,130 $ 7,159 $ 7,707 Effective tax provision rate 17.5 % 17.5 % 17.2 % 17.5 % We do not believe that we have any material uncertain tax positions, and do not expect any material changes during the next twelve months.

Regulatory Capital Matters

Regulatory Capital Matters	9 Months Ended
	Sep. 30, 2021
Regulatory Capital Requirements under Banking Regulations [Abstract]
Regulatory Capital Matters	Regulatory Capital Matters Banks and bank holding companies are subject to regulatory capital requirements administered by federal banking agencies. Capital adequacy guidelines and, additionally for banks, prompt corrective action regulations involve quantitative measures of assets, liabilities, and certain off-balance sheet items calculated under regulatory accounting practices. Capital amounts and classifications are also subject to qualitative judgments by regulators. Failure to meet capital requirements can initiate regulatory action. Under the Basel III rules, the Parent Company and the Bank must hold a capital conservation buffer above the adequately capitalized risk-based capital ratios. The fully phased in capital conservation buffer is 2.50% for all periods presented. The net unrealized gain or loss on available for sale securities is not included in computing regulatory capital. As of September 30, 2021, both the Parent Company and the Bank met all capital adequacy requirements to which they were subject. Prompt corrective action regulations provide five classifications: well-capitalized, adequately capitalized, undercapitalized, significantly undercapitalized, and critically undercapitalized, although these terms are not used to represent overall financial condition. If adequately capitalized, regulatory approval is required to accept brokered deposits. If undercapitalized, capital distributions are limited, as is asset growth and expansion, and capital restoration plans are required. As of September 30, 2021 and December 31, 2020, the most recent regulatory notifications categorized the Bank as well-capitalized under the regulatory framework for prompt corrective action. There are no conditions or events since that notification that management believes have changed the Bank’s category. Actual and required capital amounts at year end for the Parent Company are as follows: Actual For Capital To be Well- Amount Ratio Amount Ratio Amount Ratio As of September 30, 2021 Total risk-based capital to risk-weighted assets: $ 552,124 12.55 % $ 351,871 8.00 % N/A N/A Tier 1 risk-based capital to risk-weighted assets: $ 453,740 10.32 % $ 263,904 6.00 % N/A N/A Common Equity Tier 1 (CET 1) to risk-weighted assets: $ 453,740 10.32 % $ 197,928 4.50 % N/A N/A Tier 1 leverage capital to average assets: $ 453,740 8.19 % $ 221,526 4.00 % N/A N/A As of December 31, 2020 Total risk-based capital to risk-weighted assets: $ 513,949 12.19 % $ 337,327 8.00 % N/A N/A Tier 1 risk-based capital to risk-weighted assets: $ 416,029 9.87 % $ 252,995 6.00 % N/A N/A Common Equity Tier 1 (CET 1) to risk-weighted assets: $ 416,029 9.87 % $ 189,746 4.50 % N/A N/A Tier 1 leverage capital to average assets: $ 416,029 8.53 % $ 195,074 4.00 % N/A N/A Actual and required capital amounts at year end for the Bank are as follows: Actual For Capital To be Well- Amount Ratio Amount Ratio Amount Ratio As of September 30, 2021 Total risk-based capital to risk-weighted assets: $ 559,556 12.76 % $ 350,802 8.00 % $ 438,502 10.00 % Tier 1 risk-based capital to risk-weighted assets: $ 511,100 11.66 % $ 263,101 6.00 % $ 350,802 8.00 % Common Equity Tier 1 (CET 1) to risk-weighted assets: $ 511,100 11.66 % $ 197,326 4.50 % $ 285,026 6.50 % Tier 1 leverage capital to average assets: $ 511,100 9.23 % $ 221,444 4.00 % $ 276,805 5.00 % As of December 31, 2020 Total risk-based capital to risk-weighted assets: $ 517,077 12.30 % $ 336,276 8.00 % $ 420,345 10.00 % Tier 1 risk-based capital to risk-weighted assets: $ 468,823 11.15 % $ 252,207 6.00 % $ 336,276 8.00 % Common Equity Tier 1 (CET 1) to risk-weighted assets: $ 468,823 11.15 % $ 189,155 4.50 % $ 273,224 6.50 % Tier 1 leverage capital to average assets: $ 468,823 9.62 % $ 195,008 4.00 % $ 243,760 5.00 %

Fair Value Measurements

Fair Value Measurements	9 Months Ended
	Sep. 30, 2021
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements We utilize fair value measurements to record or disclose the fair value on certain assets and liabilities. Fair value is the exchange price that would be received for an asset or paid to transfer a liability (exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. The determination of fair values of financial instruments often requires the use of estimates. In cases where quoted market values in an active market are not available, we use present value techniques and other valuation methods to estimate the fair values of our financial instruments. These valuation models rely on market-based parameters when available, such as interest rate yield curves or credit spreads. Unobservable inputs may be based on management’s judgement assumptions and estimates related to credit quality, our future earnings, interest rates and other relevant inputs. These valuation methods require considerable judgement and the resulting estimates of fair value can be significantly affected by the assumptions made and the methods used. ASC Topic 820 establishes a three-level valuation hierarchy for disclosure of fair value measurements. The hierarchy is based on the transparency of the inputs used in the valuation process with the highest priority given to quoted prices available in active markets and the lowest priority to unobservable inputs where no active market exists. The three levels of inputs that may be used to measure fair value are as follows: Level 1 : Unadjusted quoted prices in active markets for identical assets or liabilities that the reporting entity has the ability to access at the measurement date. Level 2 : Inputs other than quoted prices included in Level 1 that are observable for the asset or liability, either directly or indirectly. These might include quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are not active, inputs other than quoted prices that are observable for the asset or liability (such as interest rates, volatilities, prepayment speeds, credit risks, etc.) or inputs that are derived principally from or corroborated by market data by correlation or other means. Level 3 : Unobservable inputs for determining the fair values of assets or liabilities that reflect an entity’s own beliefs about the assumptions that market participants would use in pricing the assets or liabilities. A financial instrument’s categorization within the valuation hierarchy is based upon the lowest level of input within the valuation hierarchy that is significant to the overall fair value measurement. Transfers between levels of the fair value hierarchy are recognized at the end of the reporting period. The following table sets forth our assets and liabilities measured at fair value on a recurring basis: Level 1 Level 2 Level 3 Quoted prices Significant Significant Total As of September 30, 2021 Available-for-sale securities $ 20,695 $ 510,700 $ — $ 531,395 Loans held-for-sale — 122,217 — 122,217 Mortgage servicing rights — — 43,971 43,971 Derivative financial instruments - assets — 12,020 — 12,020 Derivative financial instruments - liabilities — (19,966) — (19,966) Total $ 20,695 $ 624,971 $ 43,971 $ 689,637 As of December 31, 2020 Available-for-sale securities $ — $ 468,586 $ — $ 468,586 Loans held-for-sale — 193,963 — 193,963 Mortgage servicing rights — — 29,144 29,144 Derivative financial instruments - assets — 18,332 — 18,332 Derivative financial instruments - liabilities — (30,792) — (30,792) Total $ — $ 650,089 $ 29,144 $ 679,233 No assets or liabilities were valued on a recurring basis at Level 1 as of December 31, 2020, nor were there any transfers between Level 2 and Level 3 during the nine months ended September 30, 2021 and the year ended December 31, 2020. For further details on our level 3 inputs related to MSRs, see Note 4. Mortgage Servicing Rights . The following table presents a reconciliation for our Level 3 assets measured at fair value on a recurring basis: For the three months ended September 30, For the nine months ended September 30, 2021 2020 2021 2020 Balance, beginning of period $ 40,844 $ 23,800 $ 29,144 $ 29,003 Total losses included in earnings (2,176) (4,609) (3,706) (19,077) Purchases, issuances, sales and settlements: Issuances 5,303 6,614 18,533 15,879 Balance, end of period $ 43,971 $ 25,805 $ 43,971 $ 25,805 Certain financial assets and financial liabilities are regularly measured at fair value on a nonrecurring basis; that is, the instruments are not measured at fair value on an ongoing basis but are subject to fair value adjustments in certain circumstances (for example, when there is evidence of impairment). The following table sets forth our assets and liabilities that were measured at fair value on a non-recurring basis as of: Level 3 September 30, 2021 December 31, 2020 Impaired loans: Commercial $ 6,304 $ 3,469 Commercial real estate 2,509 84 Residential real estate 1,675 601 Total impaired loans $ 10,488 $ 4,154 Other real estate owned and foreclosed assets, net: Commercial real estate $ 5,747 $ 3,354 The fair value of the financial assets in the table above utilize the market approach valuation technique, with discount adjustments for differences between comparable sales. Fair value of financial instruments not carried at fair value: The carrying amounts and estimated fair values of financial instruments not carried at fair value are as follows: Estimated Fair Value Carrying Total Level 1 Level 2 Level 3 As of September 30, 2021 Assets: Cash and cash equivalents $ 949,541 $ 949,541 $ 949,541 $ — $ — Securities held-to-maturity 19,811 20,693 — 20,693 — Loans (excluding impaired loans) 3,781,213 3,722,746 — — 3,722,746 Restricted equity securities 16,927 16,927 — 16,927 — Accrued interest receivable 16,649 16,649 — 1,129 15,520 Liabilities: Deposits (excluding demand deposits) $ 3,078,169 $ 3,203,052 $ — $ 3,203,052 $ — Securities sold under agreements to repurchase 117,001 117,001 — 117,001 — FHLB advances 40,000 41,821 — 41,821 — Convertible notes payable, net 19,256 21,201 — 21,201 — Subordinated debt, net 49,928 52,099 — 52,099 — Accrued interest payable 2,768 2,768 — 2,768 — As of December 31, 2020 Assets: Cash and cash equivalents $ 201,978 $ 201,978 $ 201,978 $ — $ — Securities held-to-maturity 32,188 33,328 — 33,328 — Loans (excluding impaired loans) 3,820,483 3,780,649 — — 3,780,649 Restricted equity securities 23,175 23,175 — 23,175 — Accrued interest receivable 15,416 15,416 — 986 14,430 Liabilities: Deposits (excluding demand deposits) $ 2,934,221 $ 2,947,287 $ — $ 2,947,287 $ — Securities sold under agreements to repurchase 115,372 115,372 — 115,372 — FHLB advances 70,411 72,770 — 72,770 — Convertible notes payable, net 18,696 20,804 — 20,804 — Subordinated debt, net 49,666 49,750 — 49,750 — Accrued interest payable 2,592 2,592 — 2,592 —

Segment Information

Segment Information	9 Months Ended
	Sep. 30, 2021
Segment Reporting [Abstract]
Segment Information	Segment InformationOur operations are conducted through two operating segments: Banking and Mortgage Operations. Corporate represents costs not allocated to the operating segments. Operating segments are defined as components of an enterprise that engage in business activity from which revenues are earned and expenses are incurred for which discrete financial information is available that is evaluated regularly by executive management in deciding how to allocate resources and in assessing performance. Operating segments have been determined based on the products and services offered and reflect the manner in which financial information is currently evaluated by management. Each segment operates under the same banking charter, but is reported on a segmented basis for this report. Each of the operating segments is complementary to each other and because of the interrelationship of the segments, the information presented is not indicative of how the segments would perform if they operated as independent entities. The Banking segment originates loans and provides deposits and fee based services to consumer, business, and mortgage lending customers. Products offered include a full range of commercial and consumer banking and financial services. The interest income on loans held-for-investment is recognized in the Banking segment, excluding newly originated residential first mortgages within the Mortgage Operations segment. The Mortgage Operations segment originates, sells, services, and manages market risk from changes in interest rates on one-to-four family residential mortgage loans to sell or hold on our balance sheet. Loans originated-to-sell comprise the majority of the lending activity. The Mortgage Operations segment recognizes interest income on loans that are held-for-sale and newly originated residential mortgages held-for-investment, the gains from one to four family residential mortgage sales, and revenue for servicing loans and other ancillary fees following a sales transaction. Revenue from servicing activities is earned on a contractual fee basis. The Mortgage Operations segment services loans for the held-for-investment portfolio, for which it earns revenue via an intercompany service fee allocation which appears as a cost to Banking in mortgage fees. Forward traded loan purchases and sales settlements as well as mortgage servicing rights and related fair value adjustments are reported in this segment. Corporate represents miscellaneous other expenses of a corporate nature as well as revenue and expenses not directly assigned or allocated to the Banking or Mortgage Operations segments. The majority of executive management’s time is spent managing operating segments; related costs have been allocated between the operating segments and Corporate. Revenues are comprised of net interest income before the provision (benefit) for loan losses and non-interest income. Noninterest expenses are allocated to each operating segment. Provision for loan losses is primarily allocated to the Banking segment. Allocation methodologies may be subject to periodic adjustment as management systems evolve and/or the business or product lines within the segments change. Significant segment totals are reconciled to the financial statements as follows for the three months ended September 30,: Banking Mortgage Operations Corporate Total Segments 2021 Summary of Operations Net interest income (expense) $ 39,297 $ 1,810 $ (1,142) $ 39,965 Provision for (benefit from) loan losses 3,543 (43) — 3,500 Noninterest income: Service charges on deposit accounts 3,471 — — 3,471 Credit and debit card fees 2,472 — — 2,472 Trust and investment advisory fees 1,974 — — 1,974 (Loss) income from mortgage banking services, net (406) 20,557 — 20,151 Other noninterest income 616 — — 616 Total noninterest income 8,127 20,557 — 28,684 Noninterest expense: Salary and employee benefits 22,604 13,166 291 36,061 Occupancy and equipment 5,854 787 2 6,643 Other noninterest expenses 8,361 2,915 590 11,866 Total noninterest expense 36,819 16,868 883 54,570 Income (loss) before income taxes $ 7,062 $ 5,542 $ (2,025) $ 10,579 Other Information Depreciation expense $ 1,516 $ 21 $ — $ 1,537 Identifiable assets $ 5,070,287 $ 578,475 $ 34,323 $ 5,683,085 Banking Mortgage Operations Corporate Total Segments 2020 Summary of Operations Net interest income (expense) $ 33,452 $ 1,991 $ (1,105) $ 34,338 Provision for (benefit from) loan losses 4,940 (140) — 4,800 Noninterest income: Service charges on deposit accounts 2,428 — — 2,428 Credit and debit card fees 2,107 — — 2,107 Trust and investment advisory fees 1,282 — — 1,282 (Loss) income from mortgage banking services, net (400) 35,935 — 35,535 Other noninterest income 1,388 (21) — 1,367 Total noninterest income 6,805 35,914 — 42,719 Noninterest expense: Salary and employee benefits 22,910 14,734 305 37,949 Occupancy 5,662 700 3 6,365 Other noninterest expenses 6,481 3,410 168 10,059 Total noninterest expense 35,053 18,844 476 54,373 Income (loss) before income taxes $ 264 $ 19,201 $ (1,581) $ 17,884 Other Information Depreciation expense $ 1,463 $ (7) $ — $ 1,456 Identifiable assets $ 4,272,570 $ 581,128 $ 35,059 $ 4,888,757 Significant segment totals are reconciled to the financial statements as follows for the nine months ended September 30,: Banking Mortgage Operations Corporate Total Segments 2021 Summary of Operations Net interest income (expense) $ 112,517 $ 5,674 $ (3,409) $ 114,782 Provision for (benefit from) loan losses 2,124 (374) — 1,750 Noninterest income: Service charges on deposit accounts 8,659 — — 8,659 Credit and debit card fees 7,140 — — 7,140 Trust and investment advisory fees 5,871 — — 5,871 (Loss) income from mortgage banking services, net (1,516) 69,660 — 68,144 Other noninterest income 5,041 (7) — 5,034 Total noninterest income 25,195 69,653 — 94,848 Noninterest expense: Salary and employee benefits 70,111 42,238 780 113,129 Occupancy and equipment 17,535 2,329 3 19,867 Other noninterest expenses 22,072 9,237 2,069 33,378 Total noninterest expense 109,718 53,804 2,852 166,374 Income (loss) before income taxes $ 25,870 $ 21,897 $ (6,261) $ 41,506 Other Information Depreciation expense $ 4,428 $ 288 $ — $ 4,716 Identifiable assets $ 5,070,287 $ 578,475 $ 34,323 $ 5,683,085 Banking Mortgage Operations Corporate Total Segments 2020 Summary of Operations Net interest income (expense) $ 95,789 $ 5,750 $ (2,383) $ 99,156 Provision for (benefit from) loan losses 15,216 (116) — 15,100 Noninterest income: Service charges on deposit accounts 7,042 — — 7,042 Credit and debit card fees 5,865 — — 5,865 Trust and investment advisory fees 3,222 — — 3,222 (Loss) income from mortgage banking services, net (1,755) 91,741 — 89,986 Other noninterest income 3,020 (21) — 2,999 Total noninterest income 17,394 91,720 — 109,114 Noninterest expense: Salary and employee benefits 63,755 37,439 804 101,998 Occupancy 16,840 2,407 4 19,251 Other noninterest expenses 18,494 8,853 542 27,889 Total noninterest expense 99,089 48,699 1,350 149,138 (Loss) income before income taxes $ (1,122) $ 48,887 $ (3,733) $ 44,032 Other Information Depreciation expense $ 4,061 $ 292 $ — $ 4,353 Identifiable assets $ 4,272,570 $ 581,128 $ 35,059 $ 4,888,757

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2021
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Commitments : We are a party to financial instruments with off-balance sheet risk in the normal course of business to meet the financing needs of our customers. These financial instruments include loan commitments, standby letters of credit, and documentary letters of credit and involve, to varying degrees, elements of credit and interest rate risk in excess of the amount recognized in the financial statements. Our exposure to credit loss in the event of nonperformance by the other party of these loan commitments and standby letters of credit is represented by the contractual amount of those instruments. We use the same credit policies in making commitments and conditional obligations as we do for on-balance sheet financial instruments. Operating leases : We lease certain facilities and equipment under non-cancelable operating leases. Operating lease amounts exclude renewal option periods, property taxes, insurance, and maintenance expenses on leased properties. Our facility leases typically provide for rental adjustments for increases in base rent (up to specific limits), property taxes, insurance, and general property maintenance that would be recorded in rent expense. Rent expense was $1,641 and $1,396 for the three months ended September 30, 2021 and 2020, respectively, and $4,955 and $4,926 for the nine months ended September 30, 2021 and 2020, respectively. Future minimum payments under all existing operating lease commitments are as follows: Remainder 2021 $ 6,721 2022 6,827 2023 6,529 2024 6,073 2025 3,831 2026 2,376 Thereafter 5,003 Total operating leases $ 37,360 Undistributed portion of committed loans and unused lines of credit : Loan commitments are agreements to lend to a customer as long as there is no customer violation of any condition established in the contract. Commitments generally have fixed expiration dates or other termination clauses and may require a payment of a fee. As of September 30, 2021 and December 31, 2020, commitments included the funding of fixed-rate loans totaling $116,455 and $95,448 and variable-rate loans totaling $657,403 and $602,142, respectively. The fixed-rate loan commitments have interest rates ranging from 0.90% to 18.00% at September 30, 2021 and 0.90% to 18.00% at December 31, 2020, and maturities ranging from 1 month to 24 years at September 30, 2021 and from 1 month to 10 years at December 31, 2020. Standby letters of credit : Standby letters of credit are conditional commitments to guarantee the performance of a customer to a third party. The credit risk involved in issuing letters of credit is essentially the same as that involved in extending loan facilities to customers. Since many of the loan commitments and letters of credit expire without being drawn upon, the total commitment amount does not necessarily represent future cash requirements. We evaluate each customer’s creditworthiness on a case-by-case basis. The amount of collateral obtained, if deemed necessary upon extension of credit, is based on our credit evaluation of the counterparty. Collateral held varies but may include accounts receivable, inventory, property, plant and equipment, owner-occupied real estate, and/or income-producing commercial properties. As of September 30, 2021 and December 31, 2020, our standby letters of credit commitment totaled $7,807 and $16,664, respectively. MPF Master Commitments : The Bank has executed MPF Master Commitments (Commitments) with the FHLB to deliver mortgage loans and to guarantee the payment of any realized losses that exceed the FHLB’s first loss account for mortgages delivered under the Commitments. The Bank receives credit enhancement fees from the FHLB for providing this guarantee and continuing to manage the credit risk of the MPF Program mortgage loans. The term of these Commitments is through December 31, 2021. As of September 30, 2021 and December 31, 2020, the Bank considered the amount of any of its liability for the present value of the credit enhancement fees less any expected losses in the mortgages delivered under the Commitments to be immaterial, and had not recorded a liability and offsetting receivable. As of September 30, 2021 and December 31, 2020 the maximum potential amount of future payments that the Bank would have been required to make under the Commitments was $13,094 and $13,029 respectively. Under the Commitments, the Bank agrees to service the loans and therefore, is responsible for any necessary foreclosure proceedings. Any future recoveries on any losses would not be paid by the FHLB under the Commitments. The Bank has not experienced any material losses under these guarantees. Contingencies : We generally sell loans to investors without recourse; therefore, the investors have assumed the risk of loss or default by the borrower. However, we are usually required by these investors to make certain standard representations and warranties relating to credit information, loan documentation, and collateral. To the extent that we do not comply with such representations, we may be required to repurchase the loans or indemnify these investors for any losses from borrower defaults. We establish reserves for potential losses related to these representations and warranties if deemed appropriate and such reserves would be recorded within accrued expenses and other liabilities. In assessing the adequacy of the reserve, we evaluate various factors including actual write-offs during the period, historical loss experience, known delinquent and other problem loans, and economic trends and conditions in the industry. From time to time, we are a defendant in various claims, legal actions, and complaints arising in the ordinary course of business. We periodically review all outstanding pending or threatened legal proceedings and determine if such matters will have an adverse effect on our business, financial condition, results of operations or cash flows. Trust Administration Litigation : On May 18, 2021, the two remainder beneficiaries of the Dorothy S. Harroun Irrevocable Trust (“Trust”), Dennis Harroun and Douglas Harroun (the “Remainder Beneficiaries”), filed a claim in the Santa Fe County, New Mexico District Court, against the Bank as trustee of the Trust, in the form of a counterclaim related to a petition for guidance and approval of trust distributions filed by the Bank on March 24, 2021 in the same court (the “Guidance Case”). The Remainder Beneficiaries’ claim alleges that the Bank breached its fiduciary duty and impartiality with respect to 2020 distributions made to the Trust’s current beneficiary, Dorothy Harroun (“Dorothy”). The Remainder Beneficiaries seek restitution and surcharge against the Bank for the full amount of the 2020 distributions, which were approximately $19.7 million, plus a reasonable rate of return thereon, as well as legal fees, costs, and expenses and the removal of the Bank as trustee of the Trust. The Bank believes that the Remainder Beneficiaries’ claims are without merit and it intends to vigorously defend against all claims asserted. On June 14, 2021, the Bank was removed as Trustee of the Dorothy S. Harroun Revocable Trust (“Revocable Trust”). The Revocable Trust held proceeds of the 2020 distributions, and, after payment of federal and state taxes related to the 2020 distributions, the Revocable Trust still had approximately $11.8 million of the 2020 distributions intact (“Funds”). On June 16, 2021, the Bank filed an interpleader action in the Santa Fe County, New Mexico District Court (“Interpleader Case”). The Interpleader Case petition requested that the Funds be paid into the registry of the Court pending final judgment in the Guidance Case. On September 30, 2021, the Court in the Interpleader Case ordered that the Funds be transferred to the Revocable Trust successor trustee, First American Bank, and that no party may make demand for distributions thereof without further Order of the Court. The Funds have been transferred to First American Bank. Dorothy and the Remainder Beneficiaries have each filed answers and counterclaims in the Interpleader Case contesting the relief sought by the Bank, and alleging that the Bank breached its fiduciary duty and impartiality as between the beneficiaries. The Bank believes that the counterclaims in the Interpleader Action are without merit and it intends to vigorously defend against all claims asserted. Overdraft Fee Litigation : On September 10, 2021, Karen McCollam filed a putative class action amended complaint against the Bank in the United States District Court for the District of Colorado. The amended complaint alleges that the Bank improperly charged overdraft fees where a transaction was initially authorized on sufficient funds but later settled negative due to intervening transactions. The complaint asserts a claim for breach of contract, which incorporates the implied duty of good faith and fair dealing, and a claim for violations of the Colorado Consumer Protection Act. Plaintiff seeks to represent a proposed class of all the Bank’s checking account customers who were allegedly charged overdraft fees on transactions that did not overdraw their checking account. Plaintiff seeks unspecified restitution, actual and statutory damages, costs, attorneys’ fees, pre-judgment interest, and other relief as the Court deems proper for herself and the putative class. On September 24, 2021, the Bank filed a motion to dismiss the amended complaint. The motion to dismiss has been fully pled, and is before the Court for decision. The Bank believes that the lawsuit is without merit and it intends to vigorously defend against all claims asserted. On September 13, 2021, Samantha Besser filed an amended putative class action complaint against the Bank in the United States District Court for the District of Colorado. The amended complaint alleges that the Bank improperly charged multiple insufficient funds or overdraft fees when a merchant resubmits a rejected payment request. The complaint asserts claims for breach of contract, which incorporates the implied duty of good faith and fair dealing. Plaintiff seeks to represent a proposed class of all the Bank’s checking account customers who were charged multiple insufficient funds or overdraft fees on resubmitted payment requests. Plaintiff seeks unspecified restitution, actual and statutory damages, costs, attorneys’ fees, pre-judgment interest, and other relief as the Court deems proper for herself and the purported class. On September 27, 2021, the Bank filed a motion to dismiss the amended complaint. The motion to dismiss has been fully pled, and is before the Court for decision. The Bank believes that the lawsuit is without merit and it intends to vigorously defend against all claims asserted. We establish reserves for contingencies, including legal proceedings, when potential losses become probable and can be reasonably estimated. While the ultimate resolution of any legal proceedings, including the matters described above, cannot be determined at this time, based on information presently available, and after consultation with legal counsel, management believes that the ultimate outcome in these above legal proceedings, either individually or in the aggregate, will not have a material adverse effect on our financial statements. It is possible, however, that future developments could result in an unfavorable outcome for or resolution of any of these proceedings, which may be material to our results of operations for a given fiscal period. COVID-19 : On March 11, 2020, the World Health Organization announced that the COVID-19 outbreak was deemed a pandemic, and on March 13, 2020, the President declared the ongoing COVID-19 pandemic of sufficient magnitude to warrant an emergency declaration. The operations and business results of the Company could be materially adversely affected, including the estimate of the allowance for loan losses. The extent to which the coronavirus may continue to impact business activity or investment results will depend on future developments, which are highly uncertain and cannot be predicted, including new information which may emerge concerning the continued severity of the coronavirus and variants, and the actions required to contain the coronavirus or treat its impact, among others.

Organization and Basis of Pre_2

Organization and Basis of Presentation (Policies)	9 Months Ended
	Sep. 30, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Nature of Operations	The consolidated financial statements include the accounts of FirstSun Capital Bancorp (“FirstSun” or “Parent Company” and its wholly-owned subsidiaries, Sunflower Bank, N.A. (the “Bank”) and Logia Portfolio Management, LLC, and have been prepared using U.S. generally accepted accounting principles (“U.S. GAAP”) for interim financial statements. All significant intercompany balances and transactions have been eliminated in consolidation. These entities are collectively referred to as “our”, “us”, “we”, or “the Company”.
Reclassification	Certain prior period amounts have been reclassified to conform to the current period presentation. Reclassifications had no effect on our net income or stockholders’ equity.
Use of Estimates	The preparation of consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions based on available information. These estimates and assumptions affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. These estimates are based on historical experience and on various assumptions about the future that are believed to be reasonable based on all available information. Our reported financial position or results of operations may be materially different under changed conditions or when using different estimates and assumptions, particularly with respect to significant accounting policies. In the event that estimates or assumptions prove to differ from actual results, adjustments are made in subsequent periods to reflect more current information.
Risks and Uncertainties	In the normal course of business, companies in the banking and mortgage industries encounter certain economic and regulatory risks. Economic risks include prepayment risk, market risk, interest rate risk, and credit risk. We are subject to interest rate risk to the extent that in a rising interest rate environment, we may experience a decrease in loan production, as well as decreases in the value of mortgage loans held-for-sale and in commitments to originate loans, which may adversely impact our earnings. Credit risk is the risk of default that may result from the borrowers’ inability or unwillingness to make contractually required payments.We generally sell loans to investors without recourse; therefore, the investors have assumed the risk of loss or default by the borrower. However, we are usually required by these investors to make certain standard representations and warranties relating to credit information, loan documentation, and collateral. To the extent that we do not comply with such representations, or there are early payment defaults, we may be required to repurchase the loans or indemnify these investors for any losses from borrower defaults. In addition, if loans pay off within a specified time frame, we may be required to refund a portion of the sales proceeds to the investors. We established reserves for potential losses related to these representations and warranties which is recorded within accrued expenses and other liabilities. In assessing the adequacy of the reserve, we evaluate various factors including actual write-offs during the period, historical loss experience, known delinquent and other problem loans, and economic trends and conditions in the industry. Further information is presented in Note 15. Commitments and Contingencies .
Adoption of New Accounting Standards	As an “emerging growth company” under Section 107 of the JOBS Act, we can take advantage of the extended transition period provided in Section 7(a)(2)(B) of the Securities Act for complying with new or revised accounting standards. Therefore, we can delay the adoption of certain accounting standards until those standards would otherwise apply to non-public business entities. We intend to take advantage of the benefits of this extended transition period for an “emerging growth company” for as long as it is available to us. For standards that we have delayed adoption, we may lack comparability to other companies who have adopted such standards. There have been no material developments with respect to newly issued standards from those disclosed in our Prospectus. We have deferred adoption of ASU 2016-02, Leases (Topic 842) and ASU 2016-13, Financial Instruments - Credit Losses (Topic 326) .
Fair Value Measurements	We utilize fair value measurements to record or disclose the fair value on certain assets and liabilities. Fair value is the exchange price that would be received for an asset or paid to transfer a liability (exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. The determination of fair values of financial instruments often requires the use of estimates. In cases where quoted market values in an active market are not available, we use present value techniques and other valuation methods to estimate the fair values of our financial instruments. These valuation models rely on market-based parameters when available, such as interest rate yield curves or credit spreads. Unobservable inputs may be based on management’s judgement assumptions and estimates related to credit quality, our future earnings, interest rates and other relevant inputs. These valuation methods require considerable judgement and the resulting estimates of fair value can be significantly affected by the assumptions made and the methods used. ASC Topic 820 establishes a three-level valuation hierarchy for disclosure of fair value measurements. The hierarchy is based on the transparency of the inputs used in the valuation process with the highest priority given to quoted prices available in active markets and the lowest priority to unobservable inputs where no active market exists. The three levels of inputs that may be used to measure fair value are as follows: Level 1 : Unadjusted quoted prices in active markets for identical assets or liabilities that the reporting entity has the ability to access at the measurement date. Level 2 : Inputs other than quoted prices included in Level 1 that are observable for the asset or liability, either directly or indirectly. These might include quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are not active, inputs other than quoted prices that are observable for the asset or liability (such as interest rates, volatilities, prepayment speeds, credit risks, etc.) or inputs that are derived principally from or corroborated by market data by correlation or other means. Level 3 : Unobservable inputs for determining the fair values of assets or liabilities that reflect an entity’s own beliefs about the assumptions that market participants would use in pricing the assets or liabilities.

Securities (Tables)

Securities (Tables)	9 Months Ended
	Sep. 30, 2021
Investments, Debt and Equity Securities [Abstract]
Schedule of Available-for-sale Securities	The amortized cost, gross unrealized gains and losses, and fair values of available-for-sale and held-to-maturity debt securities by type follows: Amortized Gross Gross Estimated As of September 30, 2021 Available-for-sale: U.S. treasury $ 20,454 $ 241 $ — $ 20,695 U.S. agency 6,493 — (104) 6,389 Obligations of states and political subdivisions 3,981 16 — 3,997 Mortgage backed - residential 132,062 2,998 (779) 134,281 Collateralized mortgage obligations 219,671 2,521 (31) 222,161 Mortgage backed - commercial 138,932 4,959 (19) 143,872 Total available-for-sale $ 521,593 $ 10,735 $ (933) $ 531,395 Held-to-maturity: Obligations of states and political subdivisions $ 720 $ 30 $ — $ 750 Mortgage backed - residential 11,686 545 — 12,231 Collateralized mortgage obligations 7,405 307 — 7,712 Total held-to-maturity $ 19,811 $ 882 $ — $ 20,693 As of December 31, 2020 Available-for-sale: U.S. agency $ 9,204 $ — $ (208) $ 8,996 Obligations of states and political subdivisions 3,427 8 — 3,435 Mortgage backed - residential 116,365 3,399 (202) 119,562 Collateralized mortgage obligations 200,496 2,743 (43) 203,196 Mortgage backed - commercial 127,022 6,426 (51) 133,397 Total available-for-sale $ 456,514 $ 12,576 $ (504) $ 468,586 Held-to-maturity: U.S. agency $ 5,099 $ 26 $ — $ 5,125 Obligations of states and political subdivisions 730 41 — 771 Mortgage backed - residential 16,050 618 — 16,668 Collateralized mortgage obligations 10,309 455 — 10,764 Total held-to-maturity $ 32,188 $ 1,140 $ — $ 33,328
Schedule of Held-to-maturity Securities	The amortized cost, gross unrealized gains and losses, and fair values of available-for-sale and held-to-maturity debt securities by type follows: Amortized Gross Gross Estimated As of September 30, 2021 Available-for-sale: U.S. treasury $ 20,454 $ 241 $ — $ 20,695 U.S. agency 6,493 — (104) 6,389 Obligations of states and political subdivisions 3,981 16 — 3,997 Mortgage backed - residential 132,062 2,998 (779) 134,281 Collateralized mortgage obligations 219,671 2,521 (31) 222,161 Mortgage backed - commercial 138,932 4,959 (19) 143,872 Total available-for-sale $ 521,593 $ 10,735 $ (933) $ 531,395 Held-to-maturity: Obligations of states and political subdivisions $ 720 $ 30 $ — $ 750 Mortgage backed - residential 11,686 545 — 12,231 Collateralized mortgage obligations 7,405 307 — 7,712 Total held-to-maturity $ 19,811 $ 882 $ — $ 20,693 As of December 31, 2020 Available-for-sale: U.S. agency $ 9,204 $ — $ (208) $ 8,996 Obligations of states and political subdivisions 3,427 8 — 3,435 Mortgage backed - residential 116,365 3,399 (202) 119,562 Collateralized mortgage obligations 200,496 2,743 (43) 203,196 Mortgage backed - commercial 127,022 6,426 (51) 133,397 Total available-for-sale $ 456,514 $ 12,576 $ (504) $ 468,586 Held-to-maturity: U.S. agency $ 5,099 $ 26 $ — $ 5,125 Obligations of states and political subdivisions 730 41 — 771 Mortgage backed - residential 16,050 618 — 16,668 Collateralized mortgage obligations 10,309 455 — 10,764 Total held-to-maturity $ 32,188 $ 1,140 $ — $ 33,328
Schedule of Available-for-sale Securities with Unrealized Losses	Certain debt securities that have gross unrealized losses and have been in a continuous unrealized loss position for more than one year follows: Less than 12 months 12 months or longer Total Estimated Unrealized Estimated Unrealized Estimated Unrealized Number As of September 30, 2021 Available-for-sale: U.S. agency $ — $ — $ 6,389 $ (104) $ 6,389 $ (104) 7 Mortgage backed - residential 36,034 (769) 2,896 (10) 38,930 (779) 9 Collateralized mortgage obligations 13,024 (27) 610 (4) 13,634 (31) 8 Mortgage backed - commercial — — 24,170 (19) 24,170 (19) 2 Total available-for-sale $ 49,058 $ (796) $ 34,065 $ (137) $ 83,123 $ (933) 26 Less than 12 months 12 months or longer Total Estimated Unrealized Estimated Unrealized Estimated Unrealized Number As of December 31, 2020 Available-for-sale: U.S. agency $ — $ — $ 8,996 $ (208) $ 8,996 $ (208) 7 Mortgage backed - residential 15,251 (146) 7,601 (56) 22,852 (202) 8 Collateralized mortgage obligations 23,646 (43) — — 23,646 (43) 11 Mortgage backed - commercial 9,167 (15) 14,971 (36) 24,138 (51) 2 Total available-for-sale $ 48,064 $ (204) $ 31,568 $ (300) $ 79,632 $ (504) 28
Schedule of Amortized Cost and Estimated Fair Value of Debt Securities by Contractual Maturity	The amortized cost and fair value of our debt securities by contractual maturity as of September 30, 2021 are summarized in the following table. Maturities are based on the final contractual payment dates and do not reflect the impact of prepayments or earlier redemptions that may occur. Amortized Estimated Available-for-sale: Due within 1 year $ 66 $ 67 Due after 1 year through 5 years 20,442 21,008 Due after 5 years through 10 years 135,566 138,722 Due after 10 years 365,519 371,598 Total available-for-sale $ 521,593 $ 531,395 Held-to-maturity: Due after 1 year through 5 years $ 720 $ 750 Due after 5 years through 10 years 702 749 Due after 10 years 18,389 19,194 Total held-to-maturity $ 19,811 $ 20,693

Loans (Tables)

Loans (Tables)	9 Months Ended
	Sep. 30, 2021
Receivables [Abstract]
Schedule of Loans Held for Investment	Loans held-for-investment consist of the following: September 30, 2021 December 31, 2020 Commercial $ 2,228,639 $ 2,181,552 Commercial real estate 1,140,181 1,156,668 Residential real estate 426,044 503,828 Consumer 17,742 14,233 Total loans 3,812,606 3,856,281 Deferred costs, fees, premiums, and discounts (8,625) (9,924) Allowance for loan losses (47,868) (47,766) Total loans, net $ 3,756,113 $ 3,798,591
Schedule of Allowance for Loan Losses by Portfolio Type	The following table presents the activity in the allowance for loan losses by portfolio type for the three months ended September 30,: Commercial Commercial Residential Consumer Total 2021 Allowance for loan losses: Balance, beginning of period $ 28,173 $ 13,149 $ 1,305 $ 351 $ 42,978 Provision for (benefit from) loan losses 3,030 560 (31) (59) 3,500 Loans charged off — — — (66) (66) Recoveries 1,440 — 3 13 1,456 Balance, end of period $ 32,643 $ 13,709 $ 1,277 $ 239 $ 47,868 2020 Allowance for loan losses: Balance, beginning of period $ 22,541 $ 13,212 $ 1,868 $ 275 $ 37,896 Provision for (benefit from) loan losses 4,030 853 (126) 43 4,800 Loans charged off (203) (1) — (32) (236) Recoveries 225 — 3 13 241 Balance, end of period $ 26,593 $ 14,064 $ 1,745 $ 299 $ 42,701 The following table presents the activity in the allowance for loan losses by portfolio type for the nine months ended September 30,: Commercial Commercial Residential Consumer Total 2021 Allowance for loan losses: Balance, beginning of period $ 32,009 $ 13,863 $ 1,606 $ 288 $ 47,766 Provision for (benefit from) loan losses 2,210 (163) (350) 53 1,750 Loans charged off (3,102) — (2) (138) (3,242) Recoveries 1,526 9 23 36 1,594 Balance, end of period $ 32,643 $ 13,709 $ 1,277 $ 239 $ 47,868 2020 Allowance for loan losses: Balance, beginning of period $ 17,509 $ 9,645 $ 1,056 $ 336 $ 28,546 Provision for loan losses 9,567 4,728 708 97 15,100 Loans charged off (997) (581) (39) (168) (1,785) Recoveries 514 272 20 34 840 Balance, end of period $ 26,593 $ 14,064 $ 1,745 $ 299 $ 42,701 The following table presents the balance in the allowance for loan losses and the recorded investment by portfolio type based on impairment method: Commercial Commercial Residential Consumer Total As of September 30, 2021 Loans: Individually evaluated for impairment $ 19,632 $ 5,203 $ 6,555 $ 3 $ 31,393 Collectively evaluated for impairment 2,209,007 1,134,978 419,489 17,739 3,781,213 Total loans $ 2,228,639 $ 1,140,181 $ 426,044 $ 17,742 $ 3,812,606 Allowance for loan losses: Individually evaluated for impairment $ 3,823 $ 387 $ 148 $ — $ 4,358 Collectively evaluated for impairment 28,820 13,322 1,129 239 43,510 Total allowance for loan losses $ 32,643 $ 13,709 $ 1,277 $ 239 $ 47,868 As of December 31, 2020 Loans: Individually evaluated for impairment $ 23,197 $ 2,933 $ 9,630 $ 38 $ 35,798 Collectively evaluated for impairment 2,158,355 1,153,735 494,198 14,195 3,820,483 Total loans $ 2,181,552 $ 1,156,668 $ 503,828 $ 14,233 $ 3,856,281 Allowance for loan losses: Individually evaluated for impairment $ 3,972 $ 12 $ 96 $ — $ 4,080 Collectively evaluated for impairment 28,037 13,851 1,510 288 43,686 Total allowance for loan losses $ 32,009 $ 13,863 $ 1,606 $ 288 $ 47,766
Schedule of Impaired Financing Receivables	The following table presents information related to impaired loans by class of loans as of: Unpaid Recorded Allowance for Average As of September 30, 2021 With no related allowance recorded: Commercial $ 10,013 $ 9,505 $ — $ 6,964 Commercial real estate 2,365 2,307 — 2,201 Residential real estate 4,717 4,732 — 3,153 Consumer 4 3 — 4 Total loans with no related allowance recorded 17,099 16,547 — 12,322 With an allowance recorded: Commercial 10,386 10,127 3,823 6,962 Commercial real estate 2,949 2,896 387 1,940 Residential real estate 1,794 1,823 148 1,224 Total loans an allowance recorded 15,129 14,846 4,358 10,126 Total impaired loans $ 32,228 $ 31,393 $ 4,358 $ 22,448 As of December 31, 2020 With no related allowance recorded: Commercial $ 16,370 $ 15,756 $ — $ 12,189 Commercial real estate 2,850 2,838 — 1,910 Residential real estate 9,021 8,933 — 5,855 Consumer 38 38 — 29 Total loans with no related allowance recorded 28,279 27,565 — 19,983 With an allowance recorded: Commercial 7,610 7,441 3,972 5,304 Commercial real estate 133 95 12 67 Residential real estate 709 697 96 479 Total loans an allowance recorded 8,452 8,233 4,080 5,850 Total impaired loans $ 36,731 $ 35,798 $ 4,080 $ 25,833
Schedule of Credit Risk Profile based on Bank’s Rating Categories	The following table presents the credit risk profile of our loan portfolio based on our rating categories: Non-Classified Classified Total As of September 30, 2021 Commercial $ 2,202,979 $ 25,660 $ 2,228,639 Commercial real estate 1,113,753 26,428 1,140,181 Residential real estate 419,557 6,487 426,044 Consumer 17,736 6 17,742 Total loans $ 3,754,025 $ 58,581 $ 3,812,606 As of December 31, 2020 Commercial $ 2,145,831 $ 35,721 $ 2,181,552 Commercial real estate 1,126,080 30,588 1,156,668 Residential real estate 494,155 9,673 503,828 Consumer 14,195 38 14,233 Total loans $ 3,780,261 $ 76,020 $ 3,856,281
Schedule of Aging of Loan Portfolio	The following table presents our loan portfolio aging analysis: Loans Loans Loans Loans Greater Non-Accrual Total As of September 30, 2021 Commercial $ 2,208,361 $ 1,639 $ — $ — $ 18,639 $ 2,228,639 Commercial 1,123,875 9,420 1,681 — 5,205 1,140,181 Residential 418,746 — 842 — 6,456 426,044 Consumer 17,721 18 — — 3 17,742 Total loans $ 3,768,703 $ 11,077 $ 2,523 $ — $ 30,303 $ 3,812,606 As of December 31, 2020 Commercial $ 2,147,310 $ 11,415 $ 48 $ — $ 22,779 $ 2,181,552 Commercial 1,144,801 8,933 — — 2,934 1,156,668 Residential 489,482 2,948 1,123 777 9,498 503,828 Consumer 14,187 8 — — 38 14,233 Total loans $ 3,795,780 $ 23,304 $ 1,171 $ 777 $ 35,249 $ 3,856,281
Schedule of Troubled Debt Restructuring	The following table presents loans by class modified as TDRs that occurred during the nine months ended September 30, 2021 and year ended December 31, 2020: Number Pre-Modification Post-Modification September 30, 2021 Commercial 5 $ 6,789 $ 5,229 Total 5 $ 6,789 $ 5,229 December 31, 2020 Commercial 11 $ 2,950 $ 2,831 Residential real estate 5 917 907 Total 16 $ 3,867 $ 3,738
Schedule of Modified Loans under the CARES Act	As of September 30, 2021, we had actively modified loans under the CARES Act as follows: Number Recorded September 30, 2021 Residential real estate 9 $ 2,517

Mortgage Servicing Rights (Tabl

Mortgage Servicing Rights (Tables)	9 Months Ended
	Sep. 30, 2021
Transfers and Servicing [Abstract]
Schedule of Unpaid Principal Loan Balance of Servicing Portfolio	The unpaid principal loan balance of our servicing portfolio is presented in the following table as of: September 30, 2021 December 31, 2020 Federal National Mortgage Association $ 2,278,202 $ 2,117,703 Federal Home Loan Mortgage Corporation 1,425,824 948,934 Government National Mortgage Association 757,859 722,138 Federal Home Loan Bank 148,214 245,246 Other 1,948 2,144 Total $ 4,612,047 $ 4,036,165
Schedule of Mortgage Servicing Rights at Fair Value	The activity of MSRs carried at fair value is as follows: For the three months ended September 30, For the nine months ended September 30, 2021 2020 2021 2020 Balance, beginning of period $ 40,844 $ 23,800 $ 29,144 $ 29,003 Additions: Servicing resulting from transfers of financial assets 5,303 6,614 18,533 15,879 Changes in fair value: Due to changes in valuation inputs or assumptions used in the valuation model 948 (2,114) 5,209 (13,215) Changes in fair value due to pay-offs, pay-downs, and runoff (3,124) (2,495) (8,915) (5,862) Balance, end of period $ 43,971 $ 25,805 $ 43,971 $ 25,805
Schedule Of Fair Value Assumptions, Servicing Assets	The following represents the weighted-average key assumptions used to estimate the fair value of MSRs as of: September 30, 2021 December 31, 2020 September 30, 2020 Discount rate 9.22 % 9.12 % 9.28 % Total prepayment speeds 12.15 % 16.99 % 18.79 % Cost of servicing each loan $86/per loan $85/per loan $86/per loan
Schedule of Servicing and Ancillary Fees from Mortgage Servicing Portfolio	Total servicing and ancillary fees earned from the mortgage servicing portfolio is presented in the following table: For the three months ended September 30, For the nine months ended September 30, 2021 2020 2021 2020 Servicing fees $ 3,101 $ 2,400 $ 8,853 $ 6,773 Late and ancillary fees 118 92 317 277 Total $ 3,219 $ 2,492 $ 9,170 $ 7,050

Derivative Financial Instrume_2

Derivative Financial Instruments (Tables)	9 Months Ended
	Sep. 30, 2021
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Derivative Instruments	The components of our banking derivative financial instruments consisted of the following: Number of Expiration Outstanding Estimated September 30, 2021 Derivative financial instruments designated as hedging instruments: Assets: Interest Rate Products 1 2029 $ 20,378 $ 1,142 Liabilities: Interest Rate Products 12 2022-2029 $ 181,390 $ 8,898 Derivative financial instruments not designated as hedging instruments: Assets: Interest Rate Products 38 2024-2036 $ 207,937 $ 8,471 Liabilities: Interest Rate Products 38 2024-2036 $ 207,937 $ 8,810 December 31, 2020 Derivative financial instruments designated as hedging instruments: Assets: Interest Rate Products 2 2026-2029 $ 38,978 $ 830 Liabilities: Interest Rate Products 12 2022-2028 $ 185,637 $ 15,792 Derivative financial instruments not designated as hedging instruments: Assets: Interest Rate Products 28 2024-2031 $ 171,609 $ 11,348 Liabilities: Interest Rate Products 28 2024-2031 $ 171,609 $ 12,117 The components of our mortgage banking derivative financial instruments consisted of the following: Expiration Outstanding Estimated September 30, 2021 Derivative financial instruments Assets: Forward MBS trades 2021 $ 257,900 $ 987 Interest rate lock commitments (IRLC) 2021 $ 188,714 $ 1,420 Liabilities: Forward MBS trades 2021 $ 150,900 $ 2,258 December 31, 2020 Derivative financial instruments Assets: Forward MBS trades 2021 $ 189,900 $ 468 Interest rate lock commitments (IRLC) 2021 $ 462,394 $ 5,686 Liabilities: Forward MBS trades 2021 $ 433,400 $ 2,883
Derivative Instruments, Gain (Loss)	We recorded gains and losses on banking derivatives assets as follows: For the three months ended September 30, For the nine months ended September 30, 2021 2020 2021 2020 Recorded (loss) gain on banking derivative $ (186) $ (221) $ (420) $ 8,608 Recorded gain (loss) on banking derivative liabilities $ 337 $ 123 $ 926 $ (9,432) We recorded gains and losses on mortgage banking derivatives assets as follows: For the three months ended September 30, For the nine months ended September 30, 2021 2020 2021 2020 Recorded gain (loss) on mortgage banking derivative assets $ 9,175 $ (19,987) $ (302) $ 7,638 Recorded (loss) gain on mortgage banking derivative liabilities $ (10,241) $ 1,925 $ (7,714) $ (989)

Deposits (Tables)

Deposits (Tables)	9 Months Ended
	Sep. 30, 2021
Statistical Disclosure for Banks [Abstract]
Schedule of Composition of Deposits	The composition of our deposits is as follows: As of September 30, 2021 December 31, 2020 Noninterest-bearing demand deposit accounts $ 1,578,306 $ 1,054,458 Interest-bearing deposit accounts: Interest-bearing demand accounts 201,510 164,870 Savings accounts and money market accounts 2,711,417 2,472,965 NOW accounts 37,888 95,297 Certificate of deposit accounts: Less than $100 151,696 164,491 $100 through $250 104,864 113,006 Greater than $250 72,304 88,462 Total interest-bearing deposit accounts 3,279,679 3,099,091 Total deposits $ 4,857,985 $ 4,153,549
Summary of Interest Expense Incurred on Deposits	The following table summarizes the interest expense incurred on our deposits: For the three months ended September 30, For the nine months ended September 30, 2021 2020 2021 2020 Interest-bearing deposit accounts: Interest-bearing demand accounts $ 89 $ 97 $ 300 $ 331 Savings accounts and money market accounts 1,155 1,635 3,668 5,901 NOW accounts 50 183 336 471 Certificate of deposit accounts 684 1,433 2,427 6,178 Total interest-bearing deposit accounts $ 1,978 $ 3,348 $ 6,731 $ 12,881
Schedule of Remaining Maturity on Certificate of Deposit Accounts	The remaining maturity on certificate of deposit accounts as of September 30, 2021 is as follows: Remainder of 2021 $ 59,117 2022 184,563 2023 47,911 2024 14,637 2025 11,001 2026 7,474 Thereafter 4,161 Total certificate of deposit accounts $ 328,864

Securities Sold Under Agreeme_2

Securities Sold Under Agreements to Repurchase (Tables)	9 Months Ended
	Sep. 30, 2021
Carrying Value of Securities Sold under Repurchase Agreements and Deposits Received for Securities Loaned [Abstract]
Schedule of Information concerning Securities Sold Under Agreements to Repurchase	Information concerning securities sold under agreements to repurchase is as follows for the periods ended: September 30, 2021 December 31, 2020 Amount outstanding at period-end $ 117,001 $ 115,372 Average daily balance during the period $ 131,444 $ 118,706 Average interest rate during the period 0.05 % 0.15 % Maximum month-end balance during the period $ 160,865 $ 149,844 Weighted average interest rate at period-end 0.04 % 0.05 %

Debt (Tables)

Debt (Tables)	9 Months Ended
	Sep. 30, 2021
Debt Disclosure [Abstract]
Schedule of Borrowings	The following is a breakdown of our FHLB advances and other borrowings outstanding as of: September 30, 2021 December 31, 2020 Amount Rate Weighted Amount Rate Weighted Variable rate line-of-credit advance $ — N/A N/A $ 20,000 0.35% N/A Fixed rate term advances $ 40,000 0.91% - 2.59% 1.49% $ 50,411 0.91% - 4.13% 1.78% $ 40,000 $ 70,411
Schedule of Maturities of FHLB Borrowings	Future maturities of our FHLB borrowings is as follows: 2022 $ 10,000 2025 20,000 Thereafter 10,000 Total $ 40,000

Earnings Per Share (Tables)

Earnings Per Share (Tables)	9 Months Ended
	Sep. 30, 2021
Earnings Per Share [Abstract]
Schedule of Earnings Per Share	The following table sets forth the computation of basic and diluted earnings per share of common stock: For the three months ended September 30, For the nine months ended September 30, 2021 2020 2021 2020 Net income applicable to common stockholders $ 8,728 $ 14,754 $ 34,347 $ 36,325 Weighted Average Shares Weighted average common shares outstanding 18,321,659 18,320,606 18,321,659 18,327,164 Effect of dilutive securities Stock-based awards 449,022 — 440,838 — Weighted average diluted common shares 18,770,681 18,320,606 18,762,497 18,327,164 Earnings per common share Basic earnings per common share $ 0.48 $ 0.81 $ 1.87 $ 1.98 Effect of dilutive securities Stock-based awards (0.02) — (0.04) — Diluted earnings per common share $ 0.46 $ 0.81 $ 1.83 $ 1.98

Stockholders' Equity (Tables)

Stockholders' Equity (Tables)	9 Months Ended
	Sep. 30, 2021
Share-based Payment Arrangement [Abstract]
Summary of Stock Option Activity	A summary of stock option activity under the Plan as of September 30, 2021, and changes during the period then ended is presented below: Shares Weighted-Average Exercise Price, per Share Weighted-Average Remaining Contractual Term (years) For the nine months ended September 30, 2021 Outstanding, beginning of period 1,428,940 $ 19.97 Exercised — — Granted 26,336 32.54 Forfeited (42,376) 20.33 Outstanding, end of period 1,412,900 $ 20.19 6.46 Options vested or expected to vest 1,412,900 $ 20.19 Options exercisable, end of period 1,166,887 $ 19.89 6.13

Income Taxes (Tables)

Income Taxes (Tables)	9 Months Ended
	Sep. 30, 2021
Income Tax Disclosure [Abstract]
Schedule of Provision for Income Tax and Effective Tax Provision Rate	The following table presents our provision for income tax and effective tax provision rate: For the three months ended September 30, For the nine months ended September 30, 2021 2020 2021 2020 Provision for income taxes $ 1,851 $ 3,130 $ 7,159 $ 7,707 Effective tax provision rate 17.5 % 17.5 % 17.2 % 17.5 %
Schedule of Provision for Income Tax and Effective Tax Provision Rate	The following table presents our provision for income tax and effective tax provision rate: For the three months ended September 30, For the nine months ended September 30, 2021 2020 2021 2020 Provision for income taxes $ 1,851 $ 3,130 $ 7,159 $ 7,707 Effective tax provision rate 17.5 % 17.5 % 17.2 % 17.5 %

Regulatory Capital Matters (Tab

Regulatory Capital Matters (Tables)	9 Months Ended
	Sep. 30, 2021
Regulatory Capital Requirements under Banking Regulations [Abstract]
Schedule of Actual and Required Capital Amounts	Actual and required capital amounts at year end for the Parent Company are as follows: Actual For Capital To be Well- Amount Ratio Amount Ratio Amount Ratio As of September 30, 2021 Total risk-based capital to risk-weighted assets: $ 552,124 12.55 % $ 351,871 8.00 % N/A N/A Tier 1 risk-based capital to risk-weighted assets: $ 453,740 10.32 % $ 263,904 6.00 % N/A N/A Common Equity Tier 1 (CET 1) to risk-weighted assets: $ 453,740 10.32 % $ 197,928 4.50 % N/A N/A Tier 1 leverage capital to average assets: $ 453,740 8.19 % $ 221,526 4.00 % N/A N/A As of December 31, 2020 Total risk-based capital to risk-weighted assets: $ 513,949 12.19 % $ 337,327 8.00 % N/A N/A Tier 1 risk-based capital to risk-weighted assets: $ 416,029 9.87 % $ 252,995 6.00 % N/A N/A Common Equity Tier 1 (CET 1) to risk-weighted assets: $ 416,029 9.87 % $ 189,746 4.50 % N/A N/A Tier 1 leverage capital to average assets: $ 416,029 8.53 % $ 195,074 4.00 % N/A N/A Actual and required capital amounts at year end for the Bank are as follows: Actual For Capital To be Well- Amount Ratio Amount Ratio Amount Ratio As of September 30, 2021 Total risk-based capital to risk-weighted assets: $ 559,556 12.76 % $ 350,802 8.00 % $ 438,502 10.00 % Tier 1 risk-based capital to risk-weighted assets: $ 511,100 11.66 % $ 263,101 6.00 % $ 350,802 8.00 % Common Equity Tier 1 (CET 1) to risk-weighted assets: $ 511,100 11.66 % $ 197,326 4.50 % $ 285,026 6.50 % Tier 1 leverage capital to average assets: $ 511,100 9.23 % $ 221,444 4.00 % $ 276,805 5.00 % As of December 31, 2020 Total risk-based capital to risk-weighted assets: $ 517,077 12.30 % $ 336,276 8.00 % $ 420,345 10.00 % Tier 1 risk-based capital to risk-weighted assets: $ 468,823 11.15 % $ 252,207 6.00 % $ 336,276 8.00 % Common Equity Tier 1 (CET 1) to risk-weighted assets: $ 468,823 11.15 % $ 189,155 4.50 % $ 273,224 6.50 % Tier 1 leverage capital to average assets: $ 468,823 9.62 % $ 195,008 4.00 % $ 243,760 5.00 %

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 2021
Fair Value Disclosures [Abstract]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis	The following table sets forth our assets and liabilities measured at fair value on a recurring basis: Level 1 Level 2 Level 3 Quoted prices Significant Significant Total As of September 30, 2021 Available-for-sale securities $ 20,695 $ 510,700 $ — $ 531,395 Loans held-for-sale — 122,217 — 122,217 Mortgage servicing rights — — 43,971 43,971 Derivative financial instruments - assets — 12,020 — 12,020 Derivative financial instruments - liabilities — (19,966) — (19,966) Total $ 20,695 $ 624,971 $ 43,971 $ 689,637 As of December 31, 2020 Available-for-sale securities $ — $ 468,586 $ — $ 468,586 Loans held-for-sale — 193,963 — 193,963 Mortgage servicing rights — — 29,144 29,144 Derivative financial instruments - assets — 18,332 — 18,332 Derivative financial instruments - liabilities — (30,792) — (30,792) Total $ — $ 650,089 $ 29,144 $ 679,233
Schedule of Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation	The following table presents a reconciliation for our Level 3 assets measured at fair value on a recurring basis: For the three months ended September 30, For the nine months ended September 30, 2021 2020 2021 2020 Balance, beginning of period $ 40,844 $ 23,800 $ 29,144 $ 29,003 Total losses included in earnings (2,176) (4,609) (3,706) (19,077) Purchases, issuances, sales and settlements: Issuances 5,303 6,614 18,533 15,879 Balance, end of period $ 43,971 $ 25,805 $ 43,971 $ 25,805
Schedule of Fair Value Measurements, Nonrecurring	The following table sets forth our assets and liabilities that were measured at fair value on a non-recurring basis as of: Level 3 September 30, 2021 December 31, 2020 Impaired loans: Commercial $ 6,304 $ 3,469 Commercial real estate 2,509 84 Residential real estate 1,675 601 Total impaired loans $ 10,488 $ 4,154 Other real estate owned and foreclosed assets, net: Commercial real estate $ 5,747 $ 3,354
Schedule of Fair Value, by Balance Sheet Grouping	The carrying amounts and estimated fair values of financial instruments not carried at fair value are as follows: Estimated Fair Value Carrying Total Level 1 Level 2 Level 3 As of September 30, 2021 Assets: Cash and cash equivalents $ 949,541 $ 949,541 $ 949,541 $ — $ — Securities held-to-maturity 19,811 20,693 — 20,693 — Loans (excluding impaired loans) 3,781,213 3,722,746 — — 3,722,746 Restricted equity securities 16,927 16,927 — 16,927 — Accrued interest receivable 16,649 16,649 — 1,129 15,520 Liabilities: Deposits (excluding demand deposits) $ 3,078,169 $ 3,203,052 $ — $ 3,203,052 $ — Securities sold under agreements to repurchase 117,001 117,001 — 117,001 — FHLB advances 40,000 41,821 — 41,821 — Convertible notes payable, net 19,256 21,201 — 21,201 — Subordinated debt, net 49,928 52,099 — 52,099 — Accrued interest payable 2,768 2,768 — 2,768 — As of December 31, 2020 Assets: Cash and cash equivalents $ 201,978 $ 201,978 $ 201,978 $ — $ — Securities held-to-maturity 32,188 33,328 — 33,328 — Loans (excluding impaired loans) 3,820,483 3,780,649 — — 3,780,649 Restricted equity securities 23,175 23,175 — 23,175 — Accrued interest receivable 15,416 15,416 — 986 14,430 Liabilities: Deposits (excluding demand deposits) $ 2,934,221 $ 2,947,287 $ — $ 2,947,287 $ — Securities sold under agreements to repurchase 115,372 115,372 — 115,372 — FHLB advances 70,411 72,770 — 72,770 — Convertible notes payable, net 18,696 20,804 — 20,804 — Subordinated debt, net 49,666 49,750 — 49,750 — Accrued interest payable 2,592 2,592 — 2,592 —

Segment Information (Tables)

Segment Information (Tables)	9 Months Ended
	Sep. 30, 2021
Segment Reporting [Abstract]
Schedule of Segment Reporting Information	Significant segment totals are reconciled to the financial statements as follows for the three months ended September 30,: Banking Mortgage Operations Corporate Total Segments 2021 Summary of Operations Net interest income (expense) $ 39,297 $ 1,810 $ (1,142) $ 39,965 Provision for (benefit from) loan losses 3,543 (43) — 3,500 Noninterest income: Service charges on deposit accounts 3,471 — — 3,471 Credit and debit card fees 2,472 — — 2,472 Trust and investment advisory fees 1,974 — — 1,974 (Loss) income from mortgage banking services, net (406) 20,557 — 20,151 Other noninterest income 616 — — 616 Total noninterest income 8,127 20,557 — 28,684 Noninterest expense: Salary and employee benefits 22,604 13,166 291 36,061 Occupancy and equipment 5,854 787 2 6,643 Other noninterest expenses 8,361 2,915 590 11,866 Total noninterest expense 36,819 16,868 883 54,570 Income (loss) before income taxes $ 7,062 $ 5,542 $ (2,025) $ 10,579 Other Information Depreciation expense $ 1,516 $ 21 $ — $ 1,537 Identifiable assets $ 5,070,287 $ 578,475 $ 34,323 $ 5,683,085 Banking Mortgage Operations Corporate Total Segments 2020 Summary of Operations Net interest income (expense) $ 33,452 $ 1,991 $ (1,105) $ 34,338 Provision for (benefit from) loan losses 4,940 (140) — 4,800 Noninterest income: Service charges on deposit accounts 2,428 — — 2,428 Credit and debit card fees 2,107 — — 2,107 Trust and investment advisory fees 1,282 — — 1,282 (Loss) income from mortgage banking services, net (400) 35,935 — 35,535 Other noninterest income 1,388 (21) — 1,367 Total noninterest income 6,805 35,914 — 42,719 Noninterest expense: Salary and employee benefits 22,910 14,734 305 37,949 Occupancy 5,662 700 3 6,365 Other noninterest expenses 6,481 3,410 168 10,059 Total noninterest expense 35,053 18,844 476 54,373 Income (loss) before income taxes $ 264 $ 19,201 $ (1,581) $ 17,884 Other Information Depreciation expense $ 1,463 $ (7) $ — $ 1,456 Identifiable assets $ 4,272,570 $ 581,128 $ 35,059 $ 4,888,757 Significant segment totals are reconciled to the financial statements as follows for the nine months ended September 30,: Banking Mortgage Operations Corporate Total Segments 2021 Summary of Operations Net interest income (expense) $ 112,517 $ 5,674 $ (3,409) $ 114,782 Provision for (benefit from) loan losses 2,124 (374) — 1,750 Noninterest income: Service charges on deposit accounts 8,659 — — 8,659 Credit and debit card fees 7,140 — — 7,140 Trust and investment advisory fees 5,871 — — 5,871 (Loss) income from mortgage banking services, net (1,516) 69,660 — 68,144 Other noninterest income 5,041 (7) — 5,034 Total noninterest income 25,195 69,653 — 94,848 Noninterest expense: Salary and employee benefits 70,111 42,238 780 113,129 Occupancy and equipment 17,535 2,329 3 19,867 Other noninterest expenses 22,072 9,237 2,069 33,378 Total noninterest expense 109,718 53,804 2,852 166,374 Income (loss) before income taxes $ 25,870 $ 21,897 $ (6,261) $ 41,506 Other Information Depreciation expense $ 4,428 $ 288 $ — $ 4,716 Identifiable assets $ 5,070,287 $ 578,475 $ 34,323 $ 5,683,085 Banking Mortgage Operations Corporate Total Segments 2020 Summary of Operations Net interest income (expense) $ 95,789 $ 5,750 $ (2,383) $ 99,156 Provision for (benefit from) loan losses 15,216 (116) — 15,100 Noninterest income: Service charges on deposit accounts 7,042 — — 7,042 Credit and debit card fees 5,865 — — 5,865 Trust and investment advisory fees 3,222 — — 3,222 (Loss) income from mortgage banking services, net (1,755) 91,741 — 89,986 Other noninterest income 3,020 (21) — 2,999 Total noninterest income 17,394 91,720 — 109,114 Noninterest expense: Salary and employee benefits 63,755 37,439 804 101,998 Occupancy 16,840 2,407 4 19,251 Other noninterest expenses 18,494 8,853 542 27,889 Total noninterest expense 99,089 48,699 1,350 149,138 (Loss) income before income taxes $ (1,122) $ 48,887 $ (3,733) $ 44,032 Other Information Depreciation expense $ 4,061 $ 292 $ — $ 4,353 Identifiable assets $ 4,272,570 $ 581,128 $ 35,059 $ 4,888,757

Commitments and Contingencies (

Commitments and Contingencies (Tables)	9 Months Ended
	Sep. 30, 2021
Commitments and Contingencies Disclosure [Abstract]
Schedule of Future Minimum Rental Payments for Operating Leases	Future minimum payments under all existing operating lease commitments are as follows: Remainder 2021 $ 6,721 2022 6,827 2023 6,529 2024 6,073 2025 3,831 2026 2,376 Thereafter 5,003 Total operating leases $ 37,360

Organization and Basis of Pre_3

Organization and Basis of Presentation (Details) - USD ($) $ in Billions	May 11, 2021	Sep. 30, 2021
Business Acquisition [Line Items]
Business combination, assets of acquiree		$ 1.6
FirstSun Capital Bancorp And Pioneer Bancshares, Inc. Merger
Business Acquisition [Line Items]
Shares issuable in merger (in shares)	1.0443
Business combination, loans of acquiree		1
Business combination, deposits of acquiree		$ 1.3

Securities - Available-for-sale

Securities - Available-for-sale Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 521,593	$ 456,514
Gross Unrealized Gains	10,735	12,576
Gross Unrealized Losses	(933)	(504)
Estimated Fair Value	531,395	468,586
U.S. treasury
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	20,454
Gross Unrealized Gains	241
Gross Unrealized Losses	0
Estimated Fair Value	20,695
U.S. agency
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	6,493	9,204
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(104)	(208)
Estimated Fair Value	6,389	8,996
Obligations of states and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	3,981	3,427
Gross Unrealized Gains	16	8
Gross Unrealized Losses	0	0
Estimated Fair Value	3,997	3,435
Mortgage backed - residential
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	132,062	116,365
Gross Unrealized Gains	2,998	3,399
Gross Unrealized Losses	(779)	(202)
Estimated Fair Value	134,281	119,562
Collateralized mortgage obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	219,671	200,496
Gross Unrealized Gains	2,521	2,743
Gross Unrealized Losses	(31)	(43)
Estimated Fair Value	222,161	203,196
Mortgage backed - commercial
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	138,932	127,022
Gross Unrealized Gains	4,959	6,426
Gross Unrealized Losses	(19)	(51)
Estimated Fair Value	$ 143,872	$ 133,397

Securities - Held-to-maturity S

Securities - Held-to-maturity Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	$ 19,811	$ 32,188
Gross Unrealized Gains	882	1,140
Gross Unrealized Losses	0	0
Estimated Fair Value	20,693	33,328
U.S. agency
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost		5,099
Gross Unrealized Gains		26
Gross Unrealized Losses		0
Estimated Fair Value		5,125
Obligations of states and political subdivisions
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	720	730
Gross Unrealized Gains	30	41
Gross Unrealized Losses	0	0
Estimated Fair Value	750	771
Mortgage backed - residential
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	11,686	16,050
Gross Unrealized Gains	545	618
Gross Unrealized Losses	0	0
Estimated Fair Value	12,231	16,668
Collateralized mortgage obligations
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	7,405	10,309
Gross Unrealized Gains	307	455
Gross Unrealized Losses	0	0
Estimated Fair Value	$ 7,712	$ 10,764

Securities - Debt Securities wi

Securities - Debt Securities with Unrealized Losses in Continuous Unrealized Loss Position (Details) $ in Thousands	Sep. 30, 2021USD ($)security	Dec. 31, 2020USD ($)security
Available-for-sale securities
Estimated Fair Value	$ 49,058	$ 48,064
Unrealized Losses	(796)	(204)
Estimated Fair Value	34,065	31,568
Unrealized Losses	(137)	(300)
Estimated Fair Value	83,123	79,632
Unrealized Losses	$ (933)	$ (504)
Number of Securities | security	26	28
U.S. agency
Available-for-sale securities
Estimated Fair Value	$ 0	$ 0
Unrealized Losses	0	0
Estimated Fair Value	6,389	8,996
Unrealized Losses	(104)	(208)
Estimated Fair Value	6,389	8,996
Unrealized Losses	$ (104)	$ (208)
Number of Securities | security	7	7
Mortgage backed - residential
Available-for-sale securities
Estimated Fair Value	$ 36,034	$ 15,251
Unrealized Losses	(769)	(146)
Estimated Fair Value	2,896	7,601
Unrealized Losses	(10)	(56)
Estimated Fair Value	38,930	22,852
Unrealized Losses	$ (779)	$ (202)
Number of Securities | security	9	8
Collateralized mortgage obligations
Available-for-sale securities
Estimated Fair Value	$ 13,024	$ 23,646
Unrealized Losses	(27)	(43)
Estimated Fair Value	610	0
Unrealized Losses	(4)	0
Estimated Fair Value	13,634	23,646
Unrealized Losses	$ (31)	$ (43)
Number of Securities | security	8	11
Mortgage backed - commercial
Available-for-sale securities
Estimated Fair Value	$ 0	$ 9,167
Unrealized Losses	0	(15)
Estimated Fair Value	24,170	14,971
Unrealized Losses	(19)	(36)
Estimated Fair Value	24,170	24,138
Unrealized Losses	$ (19)	$ (51)
Number of Securities | security	2	2

Securities - Additional Informa

Securities - Additional Information (Details) - USD ($)	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract]
Pledged securities	$ 466,982,000		$ 437,223,000
Proceeds from sale and maturity of securities	$ 0	$ 56,159,000
Gross investment gains		446,000
Gross investment gains losses		$ 293,000

Securities - Available-for-sa_2

Securities - Available-for-sale Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Amortized Cost
Due within 1 year	$ 66
Due after 1 year through 5 years	20,442
Due after 5 years through 10 years	135,566
Due after 10 years	365,519
Amortized Cost	521,593	$ 456,514
Estimated Fair Value
Due within 1 year	67
Due after 1 year through 5 years	21,008
Due after 5 years through 10 years	138,722
Due after 10 years	371,598
Fair value	$ 531,395	$ 468,586

Securities - Held-to-maturity_2

Securities - Held-to-maturity Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Amortized Cost
Due after 1 year through 5 years	$ 720
Due after 5 years through 10 years	702
Due after 10 years	18,389
Amortized Cost	19,811	$ 32,188
Estimated Fair Value
Due after 1 year through 5 years	750
Due after 5 years through 10 years	749
Due after 10 years	19,194
Held-to-maturity securities, Fair Value	$ 20,693	$ 33,328

Loans - Loans Held for Investme

Loans - Loans Held for Investment (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Jun. 30, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2019
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	$ 3,812,606		$ 3,856,281
Deferred costs, fees, premiums, and discounts	(8,625)		(9,924)
Allowance for loan losses	(47,868)	$ (42,978)	(47,766)	$ (42,701)	$ (37,896)	$ (28,546)
Total loans, net	3,756,113		3,798,591
Commercial
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	2,228,639		2,181,552
Allowance for loan losses	(32,643)	(28,173)	(32,009)	(26,593)	(22,541)	(17,509)
Commercial real estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	1,140,181		1,156,668
Allowance for loan losses	(13,709)	(13,149)	(13,863)	(14,064)	(13,212)	(9,645)
Residential real estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	426,044		503,828
Allowance for loan losses	(1,277)	(1,305)	(1,606)	(1,745)	(1,868)	(1,056)
Consumer
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	17,742		14,233
Allowance for loan losses	$ (239)	$ (351)	$ (288)	$ (299)	$ (275)	$ (336)

Loans - Additional Information

Loans - Additional Information (Details) - USD ($)	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020	Jun. 30, 2021	Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2019
Financing Receivable, Allowance for Credit Loss [Line Items]
PPP loans outstanding	$ 3,812,606,000	$ 3,856,281,000
Deferred processing fees	(8,625,000)	(9,924,000)
Loans, allowance for loan losses	47,868,000	47,766,000	$ 42,978,000	$ 42,701,000	$ 37,896,000	$ 28,546,000
Recorded investment in troubled debt restructurings (TDRs)	18,750,000	13,975,000
Increase of allowance for loan losses from modification	1,441,000	1,464,000
TDRs loans charged off	0	0
Total loans modified as Troubled Debt Restructuring (TDRs) with a subsequent default		1,759,000
Accretable discount on loans acquired	770,000	2,043,000
Commercial
Financing Receivable, Allowance for Credit Loss [Line Items]
PPP loans outstanding	2,228,639,000	2,181,552,000
Loans, allowance for loan losses	32,643,000	32,009,000	$ 28,173,000	$ 26,593,000	$ 22,541,000	$ 17,509,000
Paycheck Protection Program CARES Act | Commercial
Financing Receivable, Allowance for Credit Loss [Line Items]
PPP loans outstanding	116,519,000	256,336,000
Deferred processing fees	3,153,000	5,235,000
Loans, allowance for loan losses	$ 0	$ 0

Loans - Allowance for Loan Loss

Loans - Allowance for Loan Losses by Portfolio Type (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Allowance for loan losses
Balance, beginning of period	$ 42,978	$ 37,896	$ 47,766	$ 28,546
Provision for (benefit from) loan losses	3,500	4,800	1,750	15,100
Loans charged off	(66)	(236)	(3,242)	(1,785)
Recoveries	1,456	241	1,594	840
Balance, end of period	47,868	42,701	47,868	42,701
Commercial
Allowance for loan losses
Balance, beginning of period	28,173	22,541	32,009	17,509
Provision for (benefit from) loan losses	3,030	4,030	2,210	9,567
Loans charged off	0	(203)	(3,102)	(997)
Recoveries	1,440	225	1,526	514
Balance, end of period	32,643	26,593	32,643	26,593
Commercial Real Estate
Allowance for loan losses
Balance, beginning of period	13,149	13,212	13,863	9,645
Provision for (benefit from) loan losses	560	853	(163)	4,728
Loans charged off	0	(1)	0	(581)
Recoveries	0	0	9	272
Balance, end of period	13,709	14,064	13,709	14,064
Residential real estate
Allowance for loan losses
Balance, beginning of period	1,305	1,868	1,606	1,056
Provision for (benefit from) loan losses	(31)	(126)	(350)	708
Loans charged off	0	0	(2)	(39)
Recoveries	3	3	23	20
Balance, end of period	1,277	1,745	1,277	1,745
Consumer
Allowance for loan losses
Balance, beginning of period	351	275	288	336
Provision for (benefit from) loan losses	(59)	43	53	97
Loans charged off	(66)	(32)	(138)	(168)
Recoveries	13	13	36	34
Balance, end of period	$ 239	$ 299	$ 239	$ 299

Loans - Allowance for Loan Lo_2

Loans - Allowance for Loan Losses and Recorded Investment by Portfolio Type based on Impairment Method (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Jun. 30, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2019
Financing Receivable, Allowance for Credit Loss [Line Items]
Individually evaluated for impairment	$ 31,393		$ 35,798
Collectively evaluated for impairment	3,781,213		3,820,483
Total loans	3,812,606		3,856,281
Individually evaluated for impairment	4,358		4,080
Collectively evaluated for impairment	43,510		43,686
Total allowance for loan losses	47,868	$ 42,978	47,766	$ 42,701	$ 37,896	$ 28,546
Commercial
Financing Receivable, Allowance for Credit Loss [Line Items]
Individually evaluated for impairment	19,632		23,197
Collectively evaluated for impairment	2,209,007		2,158,355
Total loans	2,228,639		2,181,552
Individually evaluated for impairment	3,823		3,972
Collectively evaluated for impairment	28,820		28,037
Total allowance for loan losses	32,643	28,173	32,009	26,593	22,541	17,509
Commercial Real Estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Individually evaluated for impairment	5,203		2,933
Collectively evaluated for impairment	1,134,978		1,153,735
Total loans	1,140,181		1,156,668
Individually evaluated for impairment	387		12
Collectively evaluated for impairment	13,322		13,851
Total allowance for loan losses	13,709	13,149	13,863	14,064	13,212	9,645
Residential real estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Individually evaluated for impairment	6,555		9,630
Collectively evaluated for impairment	419,489		494,198
Total loans	426,044		503,828
Individually evaluated for impairment	148		96
Collectively evaluated for impairment	1,129		1,510
Total allowance for loan losses	1,277	1,305	1,606	1,745	1,868	1,056
Consumer
Financing Receivable, Allowance for Credit Loss [Line Items]
Individually evaluated for impairment	3		38
Collectively evaluated for impairment	17,739		14,195
Total loans	17,742		14,233
Individually evaluated for impairment	0		0
Collectively evaluated for impairment	239		288
Total allowance for loan losses	$ 239	$ 351	$ 288	$ 299	$ 275	$ 336

Loans - Impaired Financing Rece

Loans - Impaired Financing Receivables (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Financing Receivable, Impaired [Line Items]
Impaired Loans with No Related Allowance Recorded - Unpaid Principal Balance	$ 17,099	$ 28,279
Impaired Loans with No Related Allowance Recorded - Recorded Investment	16,547	27,565
Impaired Loans with No Related Allowance Recorded - Average Recorded Investment	12,322	19,983
Impaired Loans with Related Allowance Recorded - Unpaid Principal Balance	15,129	8,452
Impaired Loans with Related Allowance Recorded - Recorded Investment	14,846	8,233
Impaired Loans with Related Allowance Recorded - Allowance for Loan Losses Allocated	4,358	4,080
Impaired Loans with Related Allowance Recorded - Average Recorded Investment	10,126	5,850
Impaired Loans - Unpaid Principal Balance	32,228	36,731
Impaired Loans - Recorded Investment	31,393	35,798
Impaired Loans - Average Recorded Investment	22,448	25,833
Commercial
Financing Receivable, Impaired [Line Items]
Impaired Loans with No Related Allowance Recorded - Unpaid Principal Balance	10,013	16,370
Impaired Loans with No Related Allowance Recorded - Recorded Investment	9,505	15,756
Impaired Loans with No Related Allowance Recorded - Average Recorded Investment	6,964	12,189
Impaired Loans with Related Allowance Recorded - Unpaid Principal Balance	10,386	7,610
Impaired Loans with Related Allowance Recorded - Recorded Investment	10,127	7,441
Impaired Loans with Related Allowance Recorded - Allowance for Loan Losses Allocated	3,823	3,972
Impaired Loans with Related Allowance Recorded - Average Recorded Investment	6,962	5,304
Commercial real estate
Financing Receivable, Impaired [Line Items]
Impaired Loans with No Related Allowance Recorded - Unpaid Principal Balance	2,365	2,850
Impaired Loans with No Related Allowance Recorded - Recorded Investment	2,307	2,838
Impaired Loans with No Related Allowance Recorded - Average Recorded Investment	2,201	1,910
Impaired Loans with Related Allowance Recorded - Unpaid Principal Balance	2,949	133
Impaired Loans with Related Allowance Recorded - Recorded Investment	2,896	95
Impaired Loans with Related Allowance Recorded - Allowance for Loan Losses Allocated	387	12
Impaired Loans with Related Allowance Recorded - Average Recorded Investment	1,940	67
Residential real estate
Financing Receivable, Impaired [Line Items]
Impaired Loans with No Related Allowance Recorded - Unpaid Principal Balance	4,717	9,021
Impaired Loans with No Related Allowance Recorded - Recorded Investment	4,732	8,933
Impaired Loans with No Related Allowance Recorded - Average Recorded Investment	3,153	5,855
Impaired Loans with Related Allowance Recorded - Unpaid Principal Balance	1,794	709
Impaired Loans with Related Allowance Recorded - Recorded Investment	1,823	697
Impaired Loans with Related Allowance Recorded - Allowance for Loan Losses Allocated	148	96
Impaired Loans with Related Allowance Recorded - Average Recorded Investment	1,224	479
Consumer
Financing Receivable, Impaired [Line Items]
Impaired Loans with No Related Allowance Recorded - Unpaid Principal Balance	4	38
Impaired Loans with No Related Allowance Recorded - Recorded Investment	3	38
Impaired Loans with No Related Allowance Recorded - Average Recorded Investment	$ 4	$ 29

Loans - Credit Risk Profile bas

Loans - Credit Risk Profile based on Bank’s Rating Categories (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	$ 3,812,606	$ 3,856,281
Non-Classified
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	3,754,025	3,780,261
Classified
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	58,581	76,020
Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	2,228,639	2,181,552
Commercial | Non-Classified
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	2,202,979	2,145,831
Commercial | Classified
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	25,660	35,721
Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,140,181	1,156,668
Commercial real estate | Non-Classified
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,113,753	1,126,080
Commercial real estate | Classified
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	26,428	30,588
Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	426,044	503,828
Residential real estate | Non-Classified
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	419,557	494,155
Residential real estate | Classified
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	6,487	9,673
Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	17,742	14,233
Consumer | Non-Classified
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	17,736	14,195
Consumer | Classified
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	$ 6	$ 38

Loans - Aging of Loan Portfolio

Loans - Aging of Loan Portfolio (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Financing Receivable, Past Due [Line Items]
Total loans	$ 3,812,606	$ 3,856,281
Loans Greater than 90 Days Past Due, Still Accruing	0	777
Non-Accrual	30,303	35,249
Commercial
Financing Receivable, Past Due [Line Items]
Total loans	2,228,639	2,181,552
Loans Greater than 90 Days Past Due, Still Accruing	0	0
Non-Accrual	18,639	22,779
Commercial real estate
Financing Receivable, Past Due [Line Items]
Total loans	1,140,181	1,156,668
Loans Greater than 90 Days Past Due, Still Accruing	0	0
Non-Accrual	5,205	2,934
Residential real estate
Financing Receivable, Past Due [Line Items]
Total loans	426,044	503,828
Loans Greater than 90 Days Past Due, Still Accruing	0	777
Non-Accrual	6,456	9,498
Consumer
Financing Receivable, Past Due [Line Items]
Total loans	17,742	14,233
Loans Greater than 90 Days Past Due, Still Accruing	0	0
Non-Accrual	3	38
Loans Not Past Due
Financing Receivable, Past Due [Line Items]
Total loans	3,768,703	3,795,780
Loans Not Past Due | Commercial
Financing Receivable, Past Due [Line Items]
Total loans	2,208,361	2,147,310
Loans Not Past Due | Commercial real estate
Financing Receivable, Past Due [Line Items]
Total loans	1,123,875	1,144,801
Loans Not Past Due | Residential real estate
Financing Receivable, Past Due [Line Items]
Total loans	418,746	489,482
Loans Not Past Due | Consumer
Financing Receivable, Past Due [Line Items]
Total loans	17,721	14,187
Loans 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total loans	11,077	23,304
Loans 30-59 Days Past Due | Commercial
Financing Receivable, Past Due [Line Items]
Total loans	1,639	11,415
Loans 30-59 Days Past Due | Commercial real estate
Financing Receivable, Past Due [Line Items]
Total loans	9,420	8,933
Loans 30-59 Days Past Due | Residential real estate
Financing Receivable, Past Due [Line Items]
Total loans	0	2,948
Loans 30-59 Days Past Due | Consumer
Financing Receivable, Past Due [Line Items]
Total loans	18	8
Loans 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total loans	2,523	1,171
Loans 60-89 Days Past Due | Commercial
Financing Receivable, Past Due [Line Items]
Total loans	0	48
Loans 60-89 Days Past Due | Commercial real estate
Financing Receivable, Past Due [Line Items]
Total loans	1,681	0
Loans 60-89 Days Past Due | Residential real estate
Financing Receivable, Past Due [Line Items]
Total loans	842	1,123
Loans 60-89 Days Past Due | Consumer
Financing Receivable, Past Due [Line Items]
Total loans	$ 0	$ 0

Loans - Troubled Debt Restructu

Loans - Troubled Debt Restructuring (Details) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2021USD ($)loan	Dec. 31, 2020USD ($)loan
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan	5	16
Pre-Modification Outstanding Recorded Investment	$ 6,789	$ 3,867
Post-Modification Outstanding Recorded Investment	$ 5,229	$ 3,738
Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan	5	11
Pre-Modification Outstanding Recorded Investment	$ 6,789	$ 2,950
Post-Modification Outstanding Recorded Investment	$ 5,229	$ 2,831
Residential real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan		5
Pre-Modification Outstanding Recorded Investment		$ 917
Post-Modification Outstanding Recorded Investment		$ 907

Loans - Schedule of Modified Lo

Loans - Schedule of Modified Loans under the CARES Act (Details) - Residential real estate - Paycheck Protection Program CARES Act $ in Thousands	9 Months Ended
	Sep. 30, 2021USD ($)loan
Financing Receivable, Allowance for Credit Loss [Line Items]
Number of Loans | loan	9
Recorded Investment | $	$ 2,517

Mortgage Servicing Rights - Unp

Mortgage Servicing Rights - Unpaid Principal Loan Balance of Servicing Portfolio (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Financing Receivable, Unpaid Principal Balance Of Servicing Portfolio [Line Items]
Unpaid principal loan balance	$ 4,612,047	$ 4,036,165
Federal National Mortgage Association
Financing Receivable, Unpaid Principal Balance Of Servicing Portfolio [Line Items]
Unpaid principal loan balance	2,278,202	2,117,703
Federal Home Loan Mortgage Corporation
Financing Receivable, Unpaid Principal Balance Of Servicing Portfolio [Line Items]
Unpaid principal loan balance	1,425,824	948,934
Government National Mortgage Association
Financing Receivable, Unpaid Principal Balance Of Servicing Portfolio [Line Items]
Unpaid principal loan balance	757,859	722,138
Federal Home Loan Bank
Financing Receivable, Unpaid Principal Balance Of Servicing Portfolio [Line Items]
Unpaid principal loan balance	148,214	245,246
Other
Financing Receivable, Unpaid Principal Balance Of Servicing Portfolio [Line Items]
Unpaid principal loan balance	$ 1,948	$ 2,144

Mortgage Servicing Rights - Mor

Mortgage Servicing Rights - Mortgage Servicing Rights at Fair Value (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Servicing Asset at Fair Value, Amount [Roll Forward]
Balance, beginning of period	$ 40,844	$ 23,800	$ 29,144	$ 29,003
Servicing resulting from transfers of financial assets	5,303	6,614	18,533	15,879
Due to changes in valuation inputs or assumptions used in the valuation model	948	(2,114)	5,209	(13,215)
Changes in fair value due to pay-offs, pay-downs, and runoff	(3,124)	(2,495)	(8,915)	(5,862)
Balance, end of period	$ 43,971	$ 25,805	$ 43,971	$ 25,805

Mortgage Servicing Rights - Wei

Mortgage Servicing Rights - Weighted-average Key Assumptions to Estimate Fair Value of MSRs (Details) - uSDPerLoan	9 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Transfers and Servicing [Abstract]
Discount rate	9.22%	9.28%	9.12%
Total prepayment speeds	12.15%	18.79%	16.99%
Cost of servicing each loan	86	86	85

Mortgage Servicing Rights - Sch

Mortgage Servicing Rights - Schedule of Servicing and Ancillary Fees from Mortgage Servicing Portfolio (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Transfers and Servicing [Abstract]
Servicing fees	$ 3,101	$ 2,400	$ 8,853	$ 6,773
Late and ancillary fees	118	92	317	277
Total	$ 3,219	$ 2,492	$ 9,170	$ 7,050

Derivative Financial Instrume_3

Derivative Financial Instruments - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Derivative [Line Items]
Carrying amount of hedged loans receivable	$ 209,552		$ 209,552		$ 239,591
Cumulative amount of fair value hedging adjustment	7,784		7,784		14,906
Fair value of derivatives in a net liability position	18,435		18,435		28,622
Posted collateral aggregate fair value	22,342		22,342		$ 31,400
Derivative financial instruments not designated as hedging instruments:
Derivative [Line Items]
Fee income	$ 246	$ 1,406	$ 1,080	$ 2,967

Derivative Financial Instrume_4

Derivative Financial Instruments - The Components Of Derivative Financial Instruments (Details) $ in Thousands	Sep. 30, 2021USD ($)transaction	Dec. 31, 2020USD ($)transaction
Forward MBS trades | Prepaid Expenses and Other Current Assets
Assets
Outstanding Notional	$ 257,900	$ 189,900
Estimated Fair Value	987	468
Forward MBS trades | Accrued Expenses And Other Liabilities
Liabilities:
Outstanding Notional	150,900	433,400
Estimated Fair Value	2,258	2,883
Interest rate lock commitments (IRLC) | Prepaid Expenses and Other Current Assets
Assets
Outstanding Notional	188,714	462,394
Estimated Fair Value	$ 1,420	$ 5,686
Interest rate lock commitments (IRLC) | Derivative financial instruments designated as hedging instruments: | Prepaid Expenses and Other Current Assets
Assets
Number of Transactions | transaction	1	2
Outstanding Notional	$ 20,378	$ 38,978
Estimated Fair Value	$ 1,142	$ 830
Interest rate lock commitments (IRLC) | Derivative financial instruments designated as hedging instruments: | Accrued Expenses And Other Liabilities
Liabilities:
Number of Transactions | transaction	12	12
Outstanding Notional	$ 181,390	$ 185,637
Estimated Fair Value	$ 8,898	$ 15,792
Interest rate lock commitments (IRLC) | Derivative financial instruments not designated as hedging instruments: | Prepaid Expenses and Other Current Assets
Assets
Number of Transactions | transaction	38	28
Outstanding Notional	$ 207,937	$ 171,609
Estimated Fair Value	$ 8,471	$ 11,348
Interest rate lock commitments (IRLC) | Derivative financial instruments not designated as hedging instruments: | Accrued Expenses And Other Liabilities
Liabilities:
Number of Transactions | transaction	38	28
Outstanding Notional	$ 207,937	$ 171,609
Estimated Fair Value	$ 8,810	$ 12,117

Derivative Financial Instrume_5

Derivative Financial Instruments - Gains And Losses On Banking Derivatives Assets and Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Banking Derivative Assets
Derivative Instruments, Gain (Loss) [Line Items]
Recorded gain (loss) on banking derivative	$ (186)	$ (221)	$ (420)	$ 8,608
Banking Derivative Liability
Derivative Instruments, Gain (Loss) [Line Items]
Recorded gain (loss) on banking derivative	337	123	926	(9,432)
Mortgage Banking Derivative Asset
Derivative Instruments, Gain (Loss) [Line Items]
Recorded gain (loss) on banking derivative	9,175	(19,987)	(302)	7,638
Mortgage Banking Derivative Liability
Derivative Instruments, Gain (Loss) [Line Items]
Recorded gain (loss) on banking derivative	$ (10,241)	$ 1,925	$ (7,714)	$ (989)

Deposits - Composition of Depos

Deposits - Composition of Deposits (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Statistical Disclosure for Banks [Abstract]
Noninterest-bearing demand deposit accounts	$ 1,578,306	$ 1,054,458
Interest-bearing deposit accounts:
Interest-bearing demand accounts	201,510	164,870
Savings accounts and money market accounts	2,711,417	2,472,965
NOW accounts	37,888	95,297
Certificate of deposit accounts:
Less than $100	151,696	164,491
$100 through $250	104,864	113,006
Greater than $250	72,304	88,462
Total interest-bearing deposit accounts	3,279,679	3,099,091
Total deposits	$ 4,857,985	$ 4,153,549

Deposits - Interest Expense Inc

Deposits - Interest Expense Incurred on Deposits (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Interest-bearing deposit accounts:
Interest-bearing demand accounts	$ 89	$ 97	$ 300	$ 331
Savings accounts and money market accounts	1,155	1,635	3,668	5,901
NOW accounts	50	183	336	471
Certificate of deposit accounts	684	1,433	2,427	6,178
Total interest-bearing deposit accounts	$ 1,978	$ 3,348	$ 6,731	$ 12,881

Deposits - Remaining Maturity o

Deposits - Remaining Maturity on Certificate of Deposit Accounts (Details) $ in Thousands	Sep. 30, 2021USD ($)
Maturities of Time Deposits [Abstract]
Remainder of 2021	$ 59,117
2022	184,563
2023	47,911
2024	14,637
2025	11,001
2026	7,474
Thereafter	4,161
Total certificate of deposit accounts	$ 328,864

Securities Sold Under Agreeme_3

Securities Sold Under Agreements to Repurchase (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Carrying Value of Securities Sold under Repurchase Agreements and Deposits Received for Securities Loaned [Abstract]
Amount outstanding at period-end	$ 117,001	$ 115,372
Average daily balance during the period	$ 131,444	$ 118,706
Average interest rate during the period	0.05%	0.15%
Maximum month-end balance during the period	$ 160,865	$ 149,844
Weighted average interest rate at period-end	0.04%	0.05%
Securities sold under agreements to repurchase, pledged securities	$ 134,701	$ 121,116

Debt - FHLB Advances and Other

Debt - FHLB Advances and Other Borrowings Outstanding (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Short-term Debt [Line Items]
Federal Home Loan Bank advances	$ 40,000	$ 70,411
Variable rate line-of-credit advance | Federal Home Loan Bank Advances
Short-term Debt [Line Items]
Federal Home Loan Bank advances	0	$ 20,000
Debt effective interest rate		0.35%
Fixed rate term advances | Federal Home Loan Bank Advances
Short-term Debt [Line Items]
Federal Home Loan Bank advances	$ 40,000	$ 50,411
Weighted Average Rate	1.49%	1.78%
Minimum | Fixed rate term advances | Federal Home Loan Bank Advances
Short-term Debt [Line Items]
Debt effective interest rate	0.91%	0.91%
Maximum | Fixed rate term advances | Federal Home Loan Bank Advances
Short-term Debt [Line Items]
Debt effective interest rate	2.59%	4.13%

Debt - Additional Information (

Debt - Additional Information (Details)	Jun. 30, 2021	Sep. 30, 2021USD ($)	Sep. 30, 2020USD ($)	Aug. 31, 2020USD ($)	Sep. 30, 2021USD ($)	Sep. 30, 2020USD ($)	Dec. 31, 2020USD ($)	Jun. 19, 2017USD ($)
Debt Conversion [Line Items]
Loans pledged to the FHLB		$ 842,678,000			$ 842,678,000		$ 943,376,000
Total borrowing capacity with the FHLB		675,641,000			675,641,000		702,540,000
Additional borrowing availability with the FHLB		556,547,000			556,547,000
Amortization of issuance costs on subordinated debt					70,000	$ 23,000
Trust preferred securities, aggregate liquidation valuation amount		419,000			419,000
Trust Preferred Securities Subject to Mandatory Redemption | New Mexico Banquest Capital Trust I (NMBCT I)
Debt Conversion [Line Items]
Debt instrument, face amount		9,279,000			9,279,000
Trust Preferred Securities Subject to Mandatory Redemption | New Mexico Banquest Capital Trust II (NMBCT II)
Debt Conversion [Line Items]
Debt instrument, face amount		4,640,000			4,640,000
Line of Credit | Other Financial Institutions
Debt Conversion [Line Items]
Line of credit facility, maximum borrowing capacity		$ 95,000,000			95,000,000
Amount drawn from line of credit					$ 0
London Interbank Offered Rate (LIBOR) | Trust Preferred Securities Subject to Mandatory Redemption | New Mexico Banquest Capital Trust I (NMBCT I)
Debt Conversion [Line Items]
Interest rate margin on variable rate basis	3.35%
Debt effective interest rate		3.50%	3.66%		3.50%	3.66%
London Interbank Offered Rate (LIBOR) | Trust Preferred Securities Subject to Mandatory Redemption | New Mexico Banquest Capital Trust II (NMBCT II)
Debt Conversion [Line Items]
Interest rate margin on variable rate basis	2.00%
Debt effective interest rate		2.15%	2.36%		2.15%	2.36%
Convertible Notes Payable | Convertible Debt
Debt Conversion [Line Items]
Debt instrument, face amount		$ 20,673,000			$ 20,673,000
Convertible debt, conversion ratio					0.0156717
Debt instrument, interest rate		3.29%			3.29%
Debt discount on the convertible notes		$ 1,418,000			$ 1,418,000		$ 1,977,000	$ 4,682,000
Amortization of debt discount		186,000	$ 188,000		559,000	$ 564,000
Subordinated Notes Due July 1, 2030 | Subordinated Debt
Debt Conversion [Line Items]
Debt instrument, face amount				$ 40,000,000
Debt instrument, interest rate			6.00%	6.00%		6.00%
Costs related to the issuance of the subordinated notes				$ 933,000
Amortization of issuance costs on subordinated debt		23,000			70,000
Subordinated Notes Due July 1, 2030 | Subordinated Debt | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Debt Conversion [Line Items]
Interest rate margin on variable rate basis				5.89%
Subordinated Debt related to Trust Preferred Securities | Subordinated Debt
Debt Conversion [Line Items]
Debt instrument, face amount		13,919,000			13,919,000
Debt discount on the convertible notes		4,293,000			4,293,000
Amortization of debt discount		$ 63,000	$ 63,000		$ 192,000	$ 192,000
Federal Reserve Bank Advances | Line of Credit
Debt Conversion [Line Items]
Line of credit facility, maximum borrowing capacity			$ 9,366,000			$ 9,366,000
Federal Reserve Bank Advances | Fed Funds target rate | Line of Credit
Debt Conversion [Line Items]
Interest rate margin on variable rate basis					0.50%

Debt - Schedule of Future Matur

Debt - Schedule of Future Maturities (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Debt Disclosure [Abstract]
2022	$ 10,000
2025	20,000
Thereafter	10,000
Total	$ 40,000	$ 70,411

Earnings Per Share - Schedule o

Earnings Per Share - Schedule of Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Earnings Per Share [Abstract]
Net income applicable to common stockholders, basic	$ 8,728	$ 14,754	$ 34,347	$ 36,325
Net income applicable to common stockholders, diluted	$ 8,728	$ 14,754	$ 34,347	$ 36,325
Weighted Average Shares
Weighted average common shares outstanding (in shares)	18,321,659	18,320,606	18,321,659	18,327,164
Effect of dilutive securities
Stock-based awards (in shares)	449,022	0	440,838	0
Weighted average diluted common shares (in shares)	18,770,681	18,320,606	18,762,497	18,327,164
Earnings per common share
Basic earnings per common share (in usd per share)	$ 0.48	$ 0.81	$ 1.87	$ 1.98
Effect of dilutive securities
Stock-based awards (in usd per share)	(0.02)	0	(0.04)	0
Diluted earnings per common share (in usd per share)	$ 0.46	$ 0.81	$ 1.83	$ 1.98

Earnings Per Share - Additional

Earnings Per Share - Additional Information (Details) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Convertible notes payable
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Securities excluded from computation of diluted earnings per share (in shares)	323,984	323,984	323,984	323,984
Stock-based awards
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Securities excluded from computation of diluted earnings per share (in shares)		98,659		161,806

Stockholders' Equity - Narrativ

Stockholders' Equity - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payment arrangement, compensation cost	$ 348	$ 526	$ 1,501	$ 1,752
Total unrecognized compensation cost related to non-vested stock options granted	1,390		1,390
Intrinsic value of the stock options	$ 15,343		$ 15,343		$ 10,660
Share-based Payment Arrangement, Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized compensation cost related to non-vested stock options granted, period			3 years 8 months 1 day
FirstSun Capital Bancorp 2017 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate shares of common stock (in shares)	1,977,292		1,977,292

Stockholders' Equity (Details)

Stockholders' Equity (Details) - $ / shares	3 Months Ended	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Shares
Outstanding, beginning balance (in shares)		1,428,940
Exercised (in shares)	1,670	0	4,892
Granted (in shares)		26,336
Forfeited (in shares)		(42,376)
Outstanding, ending balance (in shares)		1,412,900
Options vested or expected to vest (in shares)		1,412,900
Options exercisable, end of period (in shares)		1,166,887
Weighted-Average Exercise Price, per Share
Outstanding, beginning balance (in dollars per share)		$ 19.97
Exercised (in dollars per share)		0
Granted (in dollars per share)		32.54
Forfeited (in dollars per share)		20.33
Outstanding, beginning balance (in dollars per share)		20.19
Weighted-average exercise price, options vested or expected to vest (in dollars per share)		20.19
Weighted-average exercise price, options exercisable, end of period (in dollars per share)		$ 19.89
Weighted-Average Remaining Contractual Term (years)
Outstanding		6 years 5 months 15 days
Options exercisable		6 years 1 month 17 days

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Income Tax Disclosure [Abstract]
Provision for income taxes	$ 1,851	$ 3,130	$ 7,159	$ 7,707
Effective tax provision rate	17.50%	17.50%	17.20%	17.50%

Regulatory Capital Matters (Det

Regulatory Capital Matters (Details) $ in Thousands	Sep. 30, 2021USD ($)	Dec. 31, 2020USD ($)
Company
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total risk-based capital to risk-weighted assets, actual amount	$ 552,124	$ 513,949
Total risk-based capital to risk-weighted assets, actual ratio	0.1255	0.1219
Total risk-based capital to risk-weighted assets, capital adequacy purposes, amount	$ 351,871	$ 337,327
Total risk-based capital to risk-weighted assets, capital adequacy purposes, ratio	0.0800	0.0800
Tier 1 risk-based capital to risk-weighted assets, actual amount	$ 453,740	$ 416,029
Tier 1 risk-based capital to risk-weighted assets, actual ratio	0.1032	0.0987
Tier 1 risk-based capital to risk-weighted assets, capital adequacy purposes, amount	$ 263,904	$ 252,995
Tier 1 risk-based capital to risk-weighted assets, capital adequacy purposes, ratio	0.0600	0.0600
Common Equity Tier 1 (CET 1) to risk-weighted assets, actual amount	$ 453,740	$ 416,029
Common Equity Tier 1 (CET 1) to risk-weighted assets, actual ratio	0.1032	0.0987
Common Equity Tier 1 (CET 1) to risk-weighted assets, capital adequacy purposes, amount	$ 197,928	$ 189,746
Common Equity Tier 1 (CET 1) to risk-weighted assets, capital adequacy purposes, ratio	0.0450	0.0450
Tier 1 leverage capital to average assets, actual amount	$ 453,740	$ 416,029
Tier 1 leverage capital to average assets, actual ratio	0.0819	0.0853
Tier 1 leverage capital to average assets, capital adequacy purposes, amount	$ 221,526	$ 195,074
Tier 1 leverage capital to average assets, capital adequacy purposes, ratio	0.0400	0.0400
Bank
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total risk-based capital to risk-weighted assets, actual amount	$ 559,556	$ 517,077
Total risk-based capital to risk-weighted assets, actual ratio	0.1276	0.1230
Total risk-based capital to risk-weighted assets, capital adequacy purposes, amount	$ 350,802	$ 336,276
Total risk-based capital to risk-weighted assets, capital adequacy purposes, ratio	0.0800	0.0800
Total risk-based capital to risk-weighted assets, to be well-capitalized under prompt corrective action provisions, amount	$ 438,502	$ 420,345
Total risk-based capital to risk-weighted assets, to be well-capitalized under prompt corrective action provisions, ratio	0.1000	0.1000
Tier 1 risk-based capital to risk-weighted assets, actual amount	$ 511,100	$ 468,823
Tier 1 risk-based capital to risk-weighted assets, actual ratio	0.1166	0.1115
Tier 1 risk-based capital to risk-weighted assets, capital adequacy purposes, amount	$ 263,101	$ 252,207
Tier 1 risk-based capital to risk-weighted assets, capital adequacy purposes, ratio	0.0600	0.0600
Tier 1 risk-based capital to risk-weighted assets, to be well-capitalized under prompt corrective action provisions, amount	$ 350,802	$ 336,276
Tier 1 risk-based capital to risk-weighted assets, to be well-capitalized under prompt corrective action provisions, ratio	0.0800	0.0800
Common Equity Tier 1 (CET 1) to risk-weighted assets, actual amount	$ 511,100	$ 468,823
Common Equity Tier 1 (CET 1) to risk-weighted assets, actual ratio	0.1166	0.1115
Common Equity Tier 1 (CET 1) to risk-weighted assets, capital adequacy purposes, amount	$ 197,326	$ 189,155
Common Equity Tier 1 (CET 1) to risk-weighted assets, capital adequacy purposes, ratio	0.0450	0.0450
Common Equity Tier 1 (CET 1) to risk-weighted assets, to be well-capitalized under prompt corrective action provisions, amount	$ 285,026	$ 273,224
Common Equity Tier 1 (CET 1) to risk-weighted assets, to be well-capitalized under prompt corrective action provisions, ratio	0.0650	0.0650
Tier 1 leverage capital to average assets, actual amount	$ 511,100	$ 468,823
Tier 1 leverage capital to average assets, actual ratio	0.0923	0.0962
Tier 1 leverage capital to average assets, capital adequacy purposes, amount	$ 221,444	$ 195,008
Tier 1 leverage capital to average assets, capital adequacy purposes, ratio	0.0400	0.0400
Tier 1 leverage capital to average assets, to be well-capitalized under prompt corrective action provisions, amount	$ 276,805	$ 243,760
Tier 1 leverage capital to average assets, to be well-capitalized under prompt corrective action provisions, ratio	0.0500	0.0500

Fair Value Measurements - Fair

Fair Value Measurements - Fair Value, Assets and Liabilities Measured on Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Jun. 30, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2019
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Mortgage servicing rights	$ 43,971	$ 40,844	$ 29,144	$ 25,805	$ 23,800	$ 29,003
Fair Value, Recurring
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available-for-sale securities	531,395		468,586
Loans held-for-sale	122,217		193,963
Mortgage servicing rights	43,971		29,144
Derivative financial instruments - assets	12,020		18,332
Derivative financial instruments - liabilities	(19,966)		(30,792)
Total	689,637		679,233
Fair Value, Recurring | Fair Value, Inputs, Level 1
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available-for-sale securities	20,695		0
Loans held-for-sale	0		0
Mortgage servicing rights	0		0
Derivative financial instruments - assets	0		0
Derivative financial instruments - liabilities	0		0
Total	20,695		0
Fair Value, Recurring | Fair Value, Inputs, Level 2
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available-for-sale securities	510,700		468,586
Loans held-for-sale	122,217		193,963
Mortgage servicing rights	0		0
Derivative financial instruments - assets	12,020		18,332
Derivative financial instruments - liabilities	(19,966)		(30,792)
Total	624,971		650,089
Fair Value, Recurring | Fair Value, Inputs, Level 3
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available-for-sale securities	0		0
Loans held-for-sale	0		0
Mortgage servicing rights	43,971		29,144
Derivative financial instruments - assets	0		0
Derivative financial instruments - liabilities	0		0
Total	$ 43,971		$ 29,144

Fair Value Measurements - Fai_2

Fair Value Measurements - Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	$ 40,844	$ 23,800	$ 29,144	$ 29,003
Total losses included in earnings	(2,176)	(4,609)	(3,706)	(19,077)
Purchases, issuances, sales and settlements:
Issuances	5,303	6,614	18,533	15,879
Balance, end of period	$ 43,971	$ 25,805	$ 43,971	$ 25,805

Fair Value Measurements - Fai_3

Fair Value Measurements - Fair Value Measurements, Nonrecurring (Details) - Fair Value, Nonrecurring - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	$ 10,488	$ 4,154
Commercial
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	6,304	3,469
Commercial real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	2,509	84
Other real estate owned and foreclosed assets, net	5,747	3,354
Residential real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	$ 1,675	$ 601

Fair Value Measurements - Fai_4

Fair Value Measurements - Fair Value by Balance Sheet Grouping (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Assets:
Securities held-to-maturity	$ 20,693	$ 33,328
Restricted equity securities	16,927	23,175
Liabilities:
Securities sold under agreements to repurchase	117,001	115,372
Carrying Value
Assets:
Cash and cash equivalents	949,541	201,978
Securities held-to-maturity	19,811	32,188
Loans (excluding impaired loans)	3,781,213	3,820,483
Restricted equity securities	16,927	23,175
Accrued interest receivable	16,649	15,416
Liabilities:
Deposits (excluding demand deposits)	3,078,169	2,934,221
Securities sold under agreements to repurchase	117,001	115,372
FHLB advances	40,000	70,411
Convertible notes payable, net	19,256	18,696
Subordinated debt, net	49,928	49,666
Accrued interest payable	2,768	2,592
Estimated Fair Value
Assets:
Cash and cash equivalents	949,541	201,978
Securities held-to-maturity	20,693	33,328
Loans (excluding impaired loans)	3,722,746	3,780,649
Restricted equity securities	16,927	23,175
Accrued interest receivable	16,649	15,416
Liabilities:
Deposits (excluding demand deposits)	3,203,052	2,947,287
Securities sold under agreements to repurchase	117,001	115,372
FHLB advances	41,821	72,770
Convertible notes payable, net	21,201	20,804
Subordinated debt, net	52,099	49,750
Accrued interest payable	2,768	2,592
Estimated Fair Value | Fair Value, Inputs, Level 1
Assets:
Cash and cash equivalents	949,541	201,978
Securities held-to-maturity	0	0
Loans (excluding impaired loans)	0	0
Restricted equity securities	0	0
Accrued interest receivable	0	0
Liabilities:
Deposits (excluding demand deposits)	0	0
Securities sold under agreements to repurchase	0	0
FHLB advances	0	0
Convertible notes payable, net	0	0
Subordinated debt, net	0	0
Accrued interest payable	0	0
Estimated Fair Value | Fair Value, Inputs, Level 2
Assets:
Cash and cash equivalents	0	0
Securities held-to-maturity	20,693	33,328
Loans (excluding impaired loans)	0	0
Restricted equity securities	16,927	23,175
Accrued interest receivable	1,129	986
Liabilities:
Deposits (excluding demand deposits)	3,203,052	2,947,287
Securities sold under agreements to repurchase	117,001	115,372
FHLB advances	41,821	72,770
Convertible notes payable, net	21,201	20,804
Subordinated debt, net	52,099	49,750
Accrued interest payable	2,768	2,592
Estimated Fair Value | Fair Value, Inputs, Level 3
Assets:
Cash and cash equivalents	0	0
Securities held-to-maturity	0	0
Loans (excluding impaired loans)	3,722,746	3,780,649
Restricted equity securities	0	0
Accrued interest receivable	15,520	14,430
Liabilities:
Deposits (excluding demand deposits)	0	0
Securities sold under agreements to repurchase	0	0
FHLB advances	0	0
Convertible notes payable, net	0	0
Subordinated debt, net	0	0
Accrued interest payable	$ 0	$ 0

Segment Information - Additiona

Segment Information - Additional Information (Details)	9 Months Ended
	Sep. 30, 2021segment
Segment Reporting [Abstract]
Number of operating segments	2

Segment Information - Schedule

Segment Information - Schedule of Segment Reporting Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Segment Reporting Information [Line Items]
Net interest income (expense)	$ 39,965	$ 34,338	$ 114,782	$ 99,156
Provision for (benefit from) loan losses	3,500	4,800	1,750	15,100
Noninterest income:
Service charges on deposit accounts	3,471	2,428	8,659	7,042
Credit and debit card fees	2,472	2,107	7,140	5,865
Trust and investment advisory fees	1,974	1,282	5,871	3,222
(Loss) income from mortgage banking services, net	20,151	35,535	68,144	89,986
Other noninterest income	616	1,367	5,034	2,999
Total noninterest income	28,684	42,719	94,848	109,114
Noninterest expense:
Salary and employee benefits	36,061	37,949	113,129	101,998
Occupancy and equipment	6,643	6,365	19,867	19,251
Other noninterest expenses	11,866	10,059	33,378	27,889
Total noninterest expense	54,570	54,373	166,374	149,138
Income before income taxes	10,579	17,884	41,506	44,032
Other Information
Depreciation expense	1,537	1,456	4,716	4,353
Identifiable assets	5,683,085	4,888,757	5,683,085	4,888,757	$ 4,995,457
Operating Segments | Banking
Segment Reporting Information [Line Items]
Net interest income (expense)	39,297	33,452	112,517	95,789
Provision for (benefit from) loan losses	3,543	4,940	2,124	15,216
Noninterest income:
Service charges on deposit accounts	3,471	2,428	8,659	7,042
Credit and debit card fees	2,472	2,107	7,140	5,865
Trust and investment advisory fees	1,974	1,282	5,871	3,222
(Loss) income from mortgage banking services, net	(406)	(400)	(1,516)	(1,755)
Other noninterest income	616	1,388	5,041	3,020
Total noninterest income	8,127	6,805	25,195	17,394
Noninterest expense:
Salary and employee benefits	22,604	22,910	70,111	63,755
Occupancy and equipment	5,854	5,662	17,535	16,840
Other noninterest expenses	8,361	6,481	22,072	18,494
Total noninterest expense	36,819	35,053	109,718	99,089
Income before income taxes	7,062	264	25,870	(1,122)
Other Information
Depreciation expense	1,516	1,463	4,428	4,061
Identifiable assets	5,070,287	4,272,570	5,070,287	4,272,570
Operating Segments | Mortgage Operations
Segment Reporting Information [Line Items]
Net interest income (expense)	1,810	1,991	5,674	5,750
Provision for (benefit from) loan losses	(43)	(140)	(374)	(116)
Noninterest income:
Service charges on deposit accounts	0	0	0	0
Credit and debit card fees	0	0	0	0
Trust and investment advisory fees	0	0	0	0
(Loss) income from mortgage banking services, net	20,557	35,935	69,660	91,741
Other noninterest income	0	(21)	(7)	(21)
Total noninterest income	20,557	35,914	69,653	91,720
Noninterest expense:
Salary and employee benefits	13,166	14,734	42,238	37,439
Occupancy and equipment	787	700	2,329	2,407
Other noninterest expenses	2,915	3,410	9,237	8,853
Total noninterest expense	16,868	18,844	53,804	48,699
Income before income taxes	5,542	19,201	21,897	48,887
Other Information
Depreciation expense	21	(7)	288	292
Identifiable assets	578,475	581,128	578,475	581,128
Corporate
Segment Reporting Information [Line Items]
Net interest income (expense)	(1,142)	(1,105)	(3,409)	(2,383)
Provision for (benefit from) loan losses	0	0	0	0
Noninterest income:
Service charges on deposit accounts	0	0	0	0
Credit and debit card fees	0	0	0	0
Trust and investment advisory fees	0	0	0	0
(Loss) income from mortgage banking services, net	0	0	0	0
Other noninterest income	0	0	0	0
Total noninterest income	0	0	0	0
Noninterest expense:
Salary and employee benefits	291	305	780	804
Occupancy and equipment	2	3	3	4
Other noninterest expenses	590	168	2,069	542
Total noninterest expense	883	476	2,852	1,350
Income before income taxes	(2,025)	(1,581)	(6,261)	(3,733)
Other Information
Depreciation expense	0	0	0	0
Identifiable assets	$ 34,323	$ 35,059	$ 34,323	$ 35,059

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Details) $ in Thousands	May 18, 2021USD ($)beneficiary	Sep. 30, 2021USD ($)	Sep. 30, 2020USD ($)	Sep. 30, 2021USD ($)	Sep. 30, 2020USD ($)	Jun. 14, 2021USD ($)	Dec. 31, 2020USD ($)
Loss Contingencies [Line Items]
Rent expense		$ 1,641	$ 1,396	$ 4,955	$ 4,926
Commitments including funding of fixed-rate loans				116,455	95,448
Commitments including funding of variable-rates loans				657,403	$ 602,142
Maximum potential amount of future payments required under the Commitments		13,094		13,094			$ 13,029
Standby Letters of Credit
Loss Contingencies [Line Items]
Standby letters of credit commitment		$ 7,807		$ 7,807			$ 16,664
Trust Administration Litigation
Loss Contingencies [Line Items]
Number of remainder Trust beneficiaries | beneficiary	2
Loss contingency, damages sought, value	$ 19,700
Revocable trust amount						$ 11,800
Minimum
Loss Contingencies [Line Items]
Fixed-rate interest		0.90%		0.90%			0.90%
Maturity period				1 month	1 month
Maximum
Loss Contingencies [Line Items]
Fixed-rate interest		18.00%		18.00%			18.00%
Maturity period				24 years	10 years

Commitments and Contingencies_2

Commitments and Contingencies - Future Minimum Operating Lease Payments (Details) $ in Thousands	Sep. 30, 2021USD ($)
Commitments and Contingencies Disclosure [Abstract]
Remainder 2021	$ 6,721
2022	6,827
2023	6,529
2024	6,073
2025	3,831
2026	2,376
Thereafter	5,003
Total operating leases	$ 37,360