Horizon Bancorp (HBNC) 10-Q 9 Nov 18 2018 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2018	Nov. 08, 2018
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2018
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	Q3
Trading Symbol	HBNC
Entity Registrant Name	HORIZON BANCORP INC /IN/
Entity Central Index Key	706,129
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Smaller reporting company	false
Emerging growth company	false
Entity Common Stock, Shares Outstanding		38,367,890

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Assets
Cash and due from banks	$ 69,697	$ 76,441
Investment securities, available for sale	542,305	509,665
Investment securities, held to maturity (fair value of $219,158 and $201,085)	223,848	200,448
Loans held for sale	1,980	3,094
Loans, net of allowance for loan losses of $17,798 and $16,394	2,939,588	2,815,601
Premises and equipment, net	75,348	75,529
Federal Home Loan Bank stock	18,073	18,105
Goodwill	119,880	119,880
Other intangible assets	10,875	12,402
Interest receivable	13,999	16,244
Cash value of life insurance	87,530	75,931
Other assets	47,438	40,963
Total assets	4,150,561	3,964,303
Liabilities
Non-interest bearing	621,475	601,805
Interest bearing	2,507,079	2,279,198
Total deposits	3,128,554	2,881,003
Borrowings	477,719	564,157
Subordinated debentures	37,791	37,653
Interest payable	1,688	886
Other liabilities	27,215	23,526
Total liabilities	3,672,967	3,507,225
Commitments and contingent liabilities
Stockholders' Equity
Preferred stock, Authorized, 1,000,000 shares, Issued 0 shares
Common stock, no par value, Authorized 99,000,000 shares (Restated - See Note 1) Issued 38,392,959 and 38,323,604 shares (Restated - See Note 1), Outstanding 38,367,890 and 38,294,729 shares (Restated - See Note 1)	0	0
Additional paid-in capital	275,804	275,059
Retained earnings	214,753	185,570
Accumulated other comprehensive loss	(12,963)	(3,551)
Total stockholders' equity	477,594	457,078
Total liabilities and stockholders' equity	$ 4,150,561	$ 3,964,303

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Statement of Financial Position [Abstract]
Investment securities, held to maturity fair value	$ 219,158	$ 201,085
Allowance for loan losses	$ 17,798	$ 16,394
Preferred stock, shares authorized	1,000,000	1,000,000
Preferred stock, shares issued	0	0
Common stock, par value
Common stock, shares authorized	99,000,000	99,000,000
Common stock, shares issued	38,392,959	38,323,604
Common stock, shares outstanding	38,367,890	38,294,729

Condensed Consolidated Statemen

Condensed Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Interest Income
Loans receivable	$ 37,522	$ 28,113	$ 108,961	$ 79,699
Investment securities
Taxable	2,739	2,167	7,732	6,817
Tax exempt	2,010	1,790	5,745	5,193
Total interest income	42,271	32,070	122,438	91,709
Interest Expense
Deposits	5,023	1,841	11,814	5,315
Borrowed funds	2,876	1,753	8,127	4,028
Subordinated debentures	600	597	1,764	1,721
Total interest expense	8,499	4,191	21,705	11,064
Net Interest Income	33,772	27,879	100,733	80,645
Provision for loan losses	1,176	710	2,378	1,370
Net Interest Income after Provision for Loan Losses	32,596	27,169	98,355	79,275
Non-interest Income
Gains on sale of investment securities (includes $(122) and $6 for the three months ended September 30, 2018 and 2017, respectively, and $(111) and $38 for the nine months ended September 30, 2018 and 2017, respectively, related to accumulated other comprehensive earnings reclassifications)	(122)	6	(111)	38
Gain on sale of mortgage loans	1,839	1,950	5,158	5,918
Mortgage servicing income net of impairment	563	369	1,423	1,175
Increase in cash value of bank owned life insurance	503	474	1,380	1,346
Death benefit on bank owned life insurance			154
Other income	469	237	1,747	613
Total non-interest income	8,686	8,021	25,936	23,792
Non-interest Expense
Salaries and employee benefits	14,343	12,911	42,525	37,086
Net occupancy expenses	2,495	2,400	7,981	7,048
Data processing	1,759	1,502	5,062	4,311
Professional fees	437	649	1,314	1,797
Outside services and consultants	1,204	2,504	3,735	4,991
Loan expense	1,722	1,215	4,504	3,572
FDIC insurance expense	396	270	1,051	776
Other losses	161	58	576	186
Other expense	3,103	3,004	9,651	8,755
Total non-interest expense	25,620	24,513	76,399	68,522
Income Before Income Taxes	15,662	10,677	47,892	34,545
Income tax expense (includes $(25) and $2 for the three months ended September 30, 2018 and 2017, respectively, and $(23) and $13 for the nine months ended September 30, 2018 and 2017, respectively, related to income tax expense from reclassification items)	2,597	2,506	7,908	9,078
Net Income	$ 13,065	$ 8,171	$ 39,984	$ 25,467
Basic Earnings Per Share	$ 0.34	$ 0.24	$ 1.04	$ 0.76
Diluted Earnings Per Share	$ 0.34	$ 0.24	$ 1.04	$ 0.75
Deposit Account [Member]
Non-interest Income
Non-interest income	$ 2,009	$ 1,672	$ 5,804	$ 4,638
Wire Transfer Fees [Member]
Non-interest Income
Non-interest income	160	175	490	503
Interchange Fees [Member]
Non-interest Income
Non-interest income	1,410	1,251	4,293	3,809
Fiduciary Activities [Member]
Non-interest Income
Non-interest income	$ 1,855	$ 1,887	$ 5,598	$ 5,752

Condensed Consolidated Statem_2

Condensed Consolidated Statements of Income (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Income Statement [Abstract]
Accumulated other comprehensive earnings reclassifications	$ (122)	$ 6	$ (111)	$ 38
Income tax expense from reclassification	$ (25)	$ 2	$ (23)	$ 13

Condensed Consolidated Statem_3

Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 13,065	$ 8,171	$ 39,984	$ 25,467
Change in fair value of derivative instruments:
Change in fair value of derivative instruments for the period	639	297	1,752	743
Income tax effect	(134)	(104)	(368)	(260)
Changes from derivative instruments	505	193	1,384	483
Change in securities:
Unrealized appreciation (depreciation) for the period on AFS securities	(3,712)	(791)	(12,655)	5,444
Amortization from transfer of securities from available for sale to held to maturity securities	(55)	(54)	(153)	(200)
Reclassification adjustment for securities (gains) losses realized in income	122	(6)	111	(38)
Income tax effect	764	297	2,667	(1,822)
Unrealized gains (losses) on securities	(2,881)	(554)	(10,030)	3,384
Other Comprehensive Income (Loss), Net of Tax	(2,376)	(361)	(8,646)	3,867
Comprehensive Income	$ 10,689	$ 7,810	$ 31,338	$ 29,334

Condensed Consolidated Statem_4

Condensed Consolidated Statement of Stockholders' Equity - 9 months ended Sep. 30, 2018 - USD ($) $ in Thousands	Total	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Loss [Member]
Beginning Balances at Dec. 31, 2017	$ 457,078	$ 275,059	$ 185,570	$ (3,551)
Net income	39,984		39,984
Other comprehensive loss, net of tax	(8,646)			(8,646)
Amortization of unearned compensation	45	45
Exercise of stock options	493	493
Stock option expense	207	207
Reclassification of tax adjustment on accumulated other comprehensive loss			766	(766)
Cash dividends on common stock	(11,567)		(11,567)
Ending Balances at Sep. 30, 2018	$ 477,594	$ 275,804	$ 214,753	$ (12,963)

Condensed Consolidated Statem_5

Condensed Consolidated Statement of Stockholders' Equity (Parenthetical)	9 Months Ended
	Sep. 30, 2018$ / shares
Statement of Stockholders' Equity [Abstract]
Cash dividends on common stock, per share	$ 0.30

Condensed Consolidated Statem_6

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Operating Activities
Net income	$ 39,984	$ 25,467
Items not requiring (providing) cash
Provision for loan losses	2,378	1,370
Depreciation and amortization	5,045	4,303
Share based compensation	207	238
Mortgage servicing rights, net impairment	26	75
Premium amortization on securities, net	4,436	4,476
Gain on sale of investment securities	111	(38)
Gain on sale of mortgage loans	(5,158)	(5,918)
Proceeds from sales of loans	157,353	174,271
Loans originated for sale	(146,088)	(163,882)
Change in cash value life insurance	(1,380)	(1,346)
Death benefit on bank owned life insurance	154
(Gain)/loss on sale of other real estate owned	(167)	12
Net change in:
Interest receivable	2,245	(1,811)
Interest payable	802	180
Other assets	(4,858)	2,215
Other liabilities	9,549	(2,335)
Net cash provided by operating activities	64,639	37,277
Investing Activities
Purchases of securities available for sale	(130,207)	(127,752)
Proceeds from sales, maturities, calls and principal repayments of securities available for sale	79,188	67,416
Purchases of securities held to maturity	(28,374)	(20,152)
Proceeds from maturities of securities held to maturity	6,109	4,883
Change in Federal Reserve and FHLB stock	32	8,987
Net change in loans	(137,864)	(154,038)
Proceeds on the sale of OREO and repossessed assets	3,298	2,125
Change in premises and equipment, net	(3,292)	(2,667)
Purchases of bank owned life insurance	(10,450)
Net cash used in investing activities	(221,560)	(189,773)
Net change in:
Deposits	247,551	(28,860)
Borrowings	(86,300)	190,814
Proceeds from issuance of stock	493	616
Dividends paid on common stock	(11,567)	(8,244)
Net cash provided by financing activities	150,177	154,326
Net Change in Cash and Cash Equivalents	(6,744)	1,830
Cash and Cash Equivalents, Beginning of Period	76,441	70,832
Cash and Cash Equivalents, End of Period	69,697	72,662
Additional Supplemental Information
Interest paid	20,903	10,836
Income taxes paid	6,661	10,350
Transfer of loans to other real estate	$ 2,398	1,717
First Farmers Bank & Trust Co [Member]
Investing Activities
Net cash received in acquisition of branch		11,000
Lafayette Community Bancorp [Member]
Investing Activities
Net cash received in acquisition of branch		20,425
LaPorte Bancorp Inc [Member]
Additional Supplemental Information
Acquisition of LaPorte, measurement period adjustments		$ 704

Accounting Policies

Accounting Policies	9 Months Ended
	Sep. 30, 2018
Accounting Policies [Abstract]
Accounting Policies	Note 1 – Accounting Policies The accompanying unaudited condensed consolidated financial statements include the accounts of Horizon Bancorp, Inc. (“Horizon” or the “Company”) and its wholly-owned subsidiaries, including Horizon Bank (“Horizon Bank” or the “Bank”). Horizon Bank (formerly known as “Horizon Bank, N.A.”) was a national association until its conversion to an Indiana commercial bank effective June 23, 2017. All inter-company balances and transactions have been eliminated. The results of operations for the periods ended September 30, 2018 and September 30, 2017 are not necessarily indicative of the operating results for the full year of 2018 or 2017. The accompanying unaudited condensed consolidated financial statements reflect all adjustments that are, in the opinion of Horizon’s management, necessary to fairly present the financial position, results of operations and cash flows of Horizon for the periods presented. Those adjustments consist only of normal recurring adjustments. Certain information and note disclosures normally included in Horizon’s annual financial statements prepared in accordance with accounting principles generally accepted in the United States of America have been condensed or omitted. These condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and notes thereto included in Horizon’s Annual Report on Form 10-K On May 15, 2018, the Board of Directors of the Company approved a three-for-two three-for-two three-for-two Basic earnings per share is computed by dividing net income available to common shareholders (net income less dividend requirements for preferred stock and accretion of preferred stock discount) by the weighted-average number of common shares outstanding. Diluted earnings per share reflect the potential dilution that could occur if securities or other contracts to issue common stock were exercised or converted into common stock. The following table shows computation of basic and diluted earnings per share. Three Months Ended Nine Months Ended September 30 September 30 2018 2017 2018 2017 Basic earnings per share Net income $ 13,065 $ 8,171 $ 39,984 $ 25,467 Weighted average common shares outstanding (1) 38,365,379 33,870,240 38,340,012 33,489,681 Basic earnings per share $ 0.34 $ 0.24 $ 1.04 $ 0.76 Diluted earnings per share Net income available to common shareholders $ 13,065 $ 8,171 $ 39,984 $ 25,467 Weighted average common shares outstanding (1) 38,365,379 33,870,240 38,340,012 33,489,681 Effect of dilutive securities: Restricted stock 47,603 55,123 43,926 50,686 Stock options 121,988 147,546 119,465 143,329 Weighted average common shares outstanding 38,534,970 34,072,909 38,503,403 33,683,696 $ 0.34 $ 0.24 $ 1.04 $ 0.75 (1) Adjusted for 3:2 stock split on June 15, 2018 There were no shares for the three and nine months ended September 30, 2018 and 2017, respectively, which were included in the computation of diluted earnings per share because they were non-dilutive. Horizon has share-based employee compensation plans, which are described in the notes to the financial statements included in the December 31, 2017 Annual Report on Form 10-K. Adoption of New Accounting Standards Financial Accounting Standards Board (FASB) Accounting Standards Update (ASU) No. 2018-02, Income Statement – Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income The FASB has issued ASU No. 2018-02, Income Statement – Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income 2018-02 FASB ASU No. 2016-01, Financial Instruments – Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities The FASB has issued ASU No. 2016-01, Financial Instruments – Overall (Subtopic 825-10): not-for-profit The new guidance makes targeted improvements to existing U.S. GAAP by: • Requiring equity investments (except those accounted for under the equity method of accounting, or those that result in consolidation of the investee) to be measured at fair value with changes in fair value recognized in net income; • Requiring public business entities to use the exit price notion when measuring the fair value of financial instruments for disclosure purposes; • Requiring separate presentation of financial assets and financial liabilities by measurement category and form of financial asset (i.e., securities or loans and receivables) on the balance sheet or the accompanying notes to the financial statements; • Eliminating the requirement to disclose the fair value of financial instruments measured at amortized cost for organizations that are not public business entities; • Eliminating the requirement for public business entities to disclose the method(s) and significant assumptions used to estimate the fair value that is required to be disclosed for financial instruments measured at amortized cost on the balance sheet; and • Requiring a reporting organization to present separately in other comprehensive income the portion of the total change in the fair value of a liability resulting from a change in the instrument-specific credit risk (also referred to as “own credit”) when the organization has elected to measure the liability at fair value in accordance with the fair value option for financial instruments. The new guidance is effective for public companies for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. The new guidance permits early adoption of the own credit provision. In addition, the new guidance permits early adoption of the provision that exempts private companies and not-for-profit 2016-01 FASB ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606) The FASB has issued ASU No. 2014-09 Revenue from Contracts with Customers (Topic 606). 2014-09 In May 2016, the FASB issued ASU No. 2016-12, Revenue from Contracts with Customers (Topic 606): Narrow-Scope Improvements and Practical Expedients In December 2016, the FASB issued ASU No. 2016-20, Revenue from Contracts with Customers (Topic 606): Technical Corrections and Improvements No. 2014-09 No. 2014-09. No. 2014-09. Revenue Recognition Accounting Standards Codification 606, “ Revenue from Contracts with Customers” non-interest • Service charges and fees on deposit accounts – these include general service fees charged for deposit account maintenance and activity and transaction-based fees charged for certain services, such as debit card, wire transfer or overdraft activities. Revenue is recognized when the performance obligation is completed, which is generally after a transaction is completed or monthly for account maintenance services. • Fiduciary activities – this includes periodic fees due from trust and wealth management customers for managing the customers’ financial assets. Fees are charged based on a standard agreement and are recognized as they are earned. Reclassifications Certain reclassifications have been made to the 2017 condensed consolidated financial statements to be comparable to 2018. These reclassifications had no effect on net income.

Acquisitions

Acquisitions	9 Months Ended
	Sep. 30, 2018
Business Combinations [Abstract]
Acquisitions	Note 2 – Acquisitions Wolverine Bancorp, Inc. On October 17, 2017, Horizon completed the acquisition of Wolverine Bancorp, Inc., a Maryland corporation (“Wolverine”) and Horizon Bank’s acquisition of Wolverine Bank, a federally chartered savings bank and wholly-owned subsidiary of Wolverine, through mergers effective October 17, 2017. Under the terms of the Merger Agreement, shareholders of Wolverine received 1.5228 shares of Horizon common stock and $14.00 in cash for each outstanding share of Wolverine common stock. Wolverine shares outstanding at the closing to be exchanged were 2,129,331, and the shares of Horizon common stock issued to Wolverine shareholders totaled 3,241,045. Based upon the October 16, 2017 closing price of $19.37 per share of Horizon common stock immediately prior to the effectiveness of the merger, less the consideration used to pay off Wolverine Bancorp’s ESOP loan receivable, the transaction has an implied valuation of approximately $93.8 million. The Company incurred approximately $1.9 million in costs related to the acquisition. These expenses are classified in the non-interest Under the acquisition method of accounting, the total purchase price is allocated to net tangible and intangible assets based on their current estimated fair values on the date of the acquisition. Based on preliminary valuations of the fair value of tangible and intangible assets acquired and liabilities assumed, which are based on estimates and assumptions that are subject to change, the final purchase price for the Wolverine acquisition is allocated as follows: Assets Liabilities Cash and due from banks $ 44,450 Deposits Non-interest $ 25,221 Loans NOW accounts 8,026 Commercial 276,167 Savings and money market 129,044 Residential mortgage 30,603 Certificates of deposit 94,688 Consumer 3,897 Total deposits 256,979 Total loans 310,667 Premises and equipment, net 2,941 Borrowings 36,970 FRB and FHLB stock 2,700 Interest payable 214 Goodwill 26,827 Other liabilities 6,154 Core deposit intangible 2,024 Interest receivable 584 Other assets 3,897 Total assets purchased $ 394,090 Total liabilities assumed $ 300,317 Common shares issued $ 62,111 Cash paid 31,662 Total estimated purchase price $ 93,773 Of the total purchase price of $93.8 million, $2.0 million has been allocated to core deposit intangible. Additionally, $26.8 million has been allocated to goodwill and none of the purchase price is deductible. The core deposit intangible is being amortized over 10 years on a straight line basis. The Company acquired various loans in the acquisition that had evidence of deterioration of credit quality since origination and it was probable, at acquisition, that all contractually required payments would not be collected. Loans purchased with evidence of credit deterioration since origination and for which it is probable that all contractually required payments will not be collected are considered to be credit impaired. Evidence of credit quality deterioration as of the purchase date may include information such as past-due non-accrual loan-to-value 310-30) The following table details the acquired loans that are accounted for in accordance with ASC 310-30 Contractually required principal and interest at acquisition $ 21,912 Contractual cash flows not expected to be collected (nonaccretable differences) 1,832 Expected cash flows at acquisition 20,080 Interest component of expected cash flows (accretable discount) 2,267 Fair value of acquired loans accounted for under ASC 310-30 $ 17,813 Final estimates of certain loans, those for which specific credit-related deterioration, since origination, are recorded at fair value, reflecting the present value of the amounts expected to be collected. Income recognition of these loans is based on reasonable expectation about the timing and amount of cash flows to be collected. Lafayette Community Bancorp On September 1, 2017, Horizon completed the acquisition of Lafayette Community Bancorp, an Indiana corporation (“Lafayette”) and Horizon Bank’s acquisition of Lafayette Community Bank, a state-chartered bank and wholly-owned subsidiary of Lafayette, through mergers effective September 1, 2017. Under the terms of the Merger Agreement, shareholders of Lafayette received 0.8817 shares of Horizon common stock and $1.73 in cash for each outstanding share of Lafayette common stock. Lafayette shareholders owning fewer than 100 shares of common stock received $17.25 in cash for each common share. Lafayette shares outstanding at the closing to be exchanged were 1,856,679, and the shares of Horizon common stock issued to Lafayette shareholders totaled 1,636,888. Based upon the August 31, 2017 closing price of $17.45 per share of Horizon common stock immediately prior to the effectiveness of the merger, the transaction has an implied valuation of approximately $34.5 million. The Company incurred approximately $1.7 million in costs related to the acquisition. These expenses are classified in the non-interest Horizon held 5% ownership in Lafayette immediately preceding the merger date. In accordance with ASC 805-10 Under the acquisition method of accounting, the total purchase price is allocated to net tangible and intangible assets based on their current estimated fair values on the date of the acquisition. Based on preliminary valuations of the fair value of tangible and intangible assets acquired and liabilities assumed, which are based on assumptions that are subject to change, the purchase price for the Lafayette acquisition is detailed in the following table. Assets Liabilities Cash and due from banks $ 24,846 Deposits Investment securities, available for sale 6 Non-interest $ 34,990 NOW accounts 30,174 Loans Savings and money market 53,663 Commercial 116,258 Certificates of deposit 32,520 Residential mortgage 12,761 Total deposits 151,347 Consumer 5,280 Total loans 134,299 Premises and equipment, net 7,818 Interest payable 42 FHLB stock 395 Other liabilities 990 Goodwill 15,408 Core deposit intangible 2,085 Interest receivable 338 Other assets 1,649 Total assets purchased $ 186,844 Total liabilities assumed $ 152,379 Common shares issued $ 30,044 (1) Cash paid 4,421 Total estimated purchase price $ 34,465 (1) This includes $955,000 of common shares previously held by Horizon. Of the total estimated purchase price of $34.5 million, $2.1 million has been allocated to core deposit intangible. Additionally, $15.4 million has been allocated to goodwill and none of the purchase price is deductible. The core deposit intangible will be amortized over 10 years on a straight-line basis. The Company acquired various loans in the acquisition that had evidence of deterioration of credit quality since origination and it was probable, at acquisition, that all contractually required payments would not be collected. Loans purchased with evidence of credit deterioration since origination and for which it is probable that all contractually required payments will not be collected are considered to be credit impaired. Evidence of credit quality deterioration as of the purchase date may include information such as past-due non-accrual loan-to-value 310-30) The following table details an estimate of the acquired loans that are accounted for in accordance with ASC 310-30 Contractually required principal and interest at acquisition $ 6,128 Contractual cash flows not expected to be collected (nonaccretable differences) 1,326 Expected cash flows at acquisition 4,802 Interest component of expected cash flows (accretable discount) 933 Fair value of acquired loans accounted for under ASC 310-30 $ 3,869 Final estimates of certain loans, those for which specific credit-related deterioration, since origination, are recorded at fair value, reflecting the present value of the amounts expected to be collected. Income recognition of these loans is based on reasonable expectation about the timing and amount of cash flows to be collected. Bargersville Branch Purchase On February 3, 2017, Horizon completed the purchase and assumption of certain assets and liabilities of a single branch of First Farmers Bank & Trust Company, in Bargersville, Indiana. Net cash of $11.0 million was received in the transaction, representing the deposit balances assumed at closing, net of amounts paid for loans acquired in the transaction of $3.4 million and a 3.0% premium on deposits. Customer deposit balances were recorded at $14.8 million and a core deposit intangible of $452,000 was recorded in the transaction, which will be amortized over 10 years on a straight line basis. There was no goodwill generated in the transaction. The results of operations of Wolverine and Lafayette have been included in the Company’s consolidated financial statements since the acquisition dates. The following schedule includes pro-forma Three Months Ended Nine Months Ended September 30 September 30 2017 2017 Summary of Operations: Net Interest Income $ 32,038 $ 62,164 Provision for Loan Losses (1,090 ) (1,337 ) Net Interest Income after Provision for Loan Losses 33,128 63,501 Non-interest 8,662 16,565 Non-interest 26,714 51,398 Income before Income Taxes 15,076 28,668 Income Tax Expense 4,549 8,412 Net Income 10,527 20,256 Net Income Available to Common Shareholders $ 10,527 $ 20,256 Basic Earnings per Share $ 0.32 $ 0.61 Diluted Earnings per Share $ 0.31 $ 0.60 The pro-forma The pro-forma

Securities

Securities	9 Months Ended
	Sep. 30, 2018
Investments, Debt and Equity Securities [Abstract]
Securities	Note 3 – Securities The fair value of securities is as follows: September 30, 2018 Amortized Gross Gross Fair Available for sale U.S. Treasury and federal agencies $ 17,036 $ — $ (464 ) $ 16,572 State and municipal 159,812 57 (3,194 ) 156,675 Federal agency collateralized mortgage obligations 178,069 — (5,398 ) 172,671 Federal agency mortgage-backed pools 193,461 16 (7,502 ) 185,975 Corporate notes 10,408 103 (99 ) 10,412 Total available for sale investment securities $ 558,786 $ 176 $ (16,657 ) $ 542,305 Held to maturity State and municipal $ 204,619 $ 1,062 $ (5,257 ) $ 200,424 Federal agency collateralized mortgage obligations 5,262 3 (182 ) 5,083 Federal agency mortgage-backed pools 13,967 27 (343 ) 13,651 Total held to maturity investment securities $ 223,848 $ 1,092 $ (5,782 ) $ 219,158 December 31, 2017 Amortized Gross Gross Fair Available for sale U.S. Treasury and federal agencies $ 19,277 $ — $ (225 ) $ 19,052 State and municipal 148,045 2,189 (670 ) 149,564 Federal agency collateralized mortgage obligations 132,871 45 (2,551 ) 130,365 Federal agency mortgage-backed pools 211,487 155 (2,985 ) 208,657 Private labeled mortgage-backed pools 1,650 — (8 ) 1,642 Corporate notes 272 113 — 385 Total available for sale investment securities $ 513,602 $ 2,502 $ (6,439) $ 509,665 Held to maturity State and municipal $ 179,836 $ 3,493 $ (2,932 ) $ 180,397 Federal agency collateralized mortgage obligations 5,734 17 (69 ) 5,682 Federal agency mortgage-backed pools 14,878 216 (88 ) 15,006 Total held to maturity investment securities $ 200,448 $ 3,726 $ (3,089 ) $ 201,085 Based on evaluation of available evidence, including recent changes in market interest rates, credit rating information, and information obtained from regulatory filings, management believes the declines in fair value for these securities are temporary. While these securities are held in the available for sale portfolio and held-to-maturity, Should the impairment of any of these securities become other than temporary, the cost basis of the investment will be reduced and the resulting loss recognized in net income in the period the other-than-temporary impairment is identified. At September 30, 2018, no individual investment security had an unrealized loss that was determined to be other-than-temporary. The unrealized losses on the Company’s investments in securities of state and municipal governmental agencies, U.S. Treasury and federal agencies, federal agency collateralized mortgage obligations, and federal agency mortgage-backed pools were caused by interest rate volatility and not a decline in credit quality. The contractual terms of those investments do not permit the issuer to settle the securities at a price less than the amortized cost basis of the investments. The Company expects to recover the amortized cost basis over the term of the securities. Because the Company does not intend to sell the investments and it is not likely that the Company will be required to sell the investments before recovery of their amortized cost basis, which may be at maturity, the Company did not consider those investments to be other-than-temporarily impaired at September 30, 2018. The amortized cost and fair value of securities available for sale and held to maturity at September 30, 2018 and December 31, 2017, by contractual maturity, are shown below. Expected maturities will differ from contractual maturities because issuers may have the right to call or prepay obligations with or without call or prepayment penalties. September 30, 2018 December 31, 2017 Amortized Fair Amortized Fair Available for sale Within one year $ 19,958 $ 19,861 $ 13,347 $ 13,326 One to five years 34,822 34,019 40,468 40,193 Five to ten years 96,035 94,103 50,473 51,156 After ten years 36,441 35,676 63,306 64,326 187,256 183,659 167,594 169,001 Federal agency collateralized mortgage obligations 178,069 172,671 132,871 130,365 Federal agency mortgage-backed pools 193,461 185,975 211,487 208,657 Private labeled mortgage-backed pools — — 1,650 1,642 Total available for sale investment securities $ 558,786 $ 542,305 $ 513,602 $ 509,665 Held to maturity Within one year $ 5,646 $ 5,628 $ 1,948 $ 1,934 One to five years 48,383 48,788 40,603 41,531 Five to ten years 102,816 101,199 89,801 91,249 After ten years 47,774 44,809 47,484 45,683 204,619 200,424 179,836 180,397 Federal agency collateralized mortgage obligations 5,262 5,083 5,734 5,682 Federal agency mortgage-backed pools 13,967 13,651 14,878 15,006 Total held to maturity investment securities $ 223,848 $ 219,158 $ 200,448 $ 201,085 The following table shows the gross unrealized losses and the fair value of the Company’s investments, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position. September 30, 2018 Less than 12 Months 12 Months or More Total Fair Unrealized Fair Unrealized Fair Unrealized Investment Securities U.S. Treasury and federal agencies $ 7,763 $ (137 ) $ 8,809 $ (327 ) $ 16,572 $ (464 ) State and municipal 215,439 (3,691 ) 56,725 (4,760 ) 272,164 (8,451 ) Federal agency collateralized mortgage obligations 72,495 (830 ) 102,498 (4,750 ) 174,993 (5,580 ) Federal agency mortgage-backed pools 48,696 (1,270 ) 145,787 (6,575 ) 194,483 (7,845 ) Corporate notes 8,124 (99) — — 8,124 (99 ) Total temporarily impaired securities $ 352,517 $ (6,027 ) $ 313,819 $ (16,412 ) $ 666,336 $ (22,439 ) December 31, 2017 Less than 12 Months 12 Months or More Total Fair Unrealized Fair Unrealized Fair Unrealized Investment Securities U.S. Treasury and federal agencies $ 15,882 $ (180 ) $ 2,870 $ (45 ) $ 18,752 $ (225 ) State and municipal 54,312 (2,758 ) 30,691 (844 ) 85,003 (3,602 ) Federal agency collateralized mortgage obligations 54,006 (589 ) 73,462 (2,031 ) 127,468 (2,620 ) Federal agency mortgage-backed pools 103,926 (1,019 ) 86,846 (2,054 ) 190,772 (3,073 ) Private labeled mortgage-backed pools 1,642 (8 ) — — 1,642 (8 ) Total temporarily impaired securities $ 229,768 $ (4,554 ) $ 193,869 $ (4,974 ) $ 423,637 $ (9,528 ) Information regarding security proceeds, gross gains and gross losses are presented below. Three Months Ended Nine Months Ended September 30 September 30 2018 2017 2018 2017 Sales of securities available for sale Proceeds $ 7,485 $ 387 $ 17,321 $ 5,490 Gross gains — 6 37 151 Gross losses (122 ) — (148 ) (113 )

Loans

Loans	9 Months Ended
	Sep. 30, 2018
Receivables [Abstract]
Loans	Note 4 – Loans September 30 December 31 2018 2017 Commercial Working capital and equipment $ 764,422 $ 720,477 Real estate, including agriculture 850,364 880,861 Tax exempt 46,171 36,324 Other 37,625 32,066 Total 1,698,582 1,669,728 Real estate 1-4 643,396 599,217 Other 7,854 7,543 Total 651,250 606,760 Consumer Auto 316,925 244,003 Recreation 13,339 8,728 Real estate/home improvement 39,104 37,052 Home equity 161,398 165,240 Unsecured 4,017 3,479 Other 1,349 2,497 Total 536,132 460,999 Mortgage warehouse 71,422 94,508 Total loans 2,957,386 2,831,995 Allowance for loan losses (17,798 ) (16,394 ) Loans, net $ 2,939,588 $ 2,815,601 Commercial Commercial loans are primarily based on the identified cash flows of the borrower and secondarily on the underlying collateral provided by the borrower. The cash flows of borrowers, however, may not be as expected, and the collateral securing these loans may fluctuate in value. Most commercial loans are secured by the assets being financed or other business assets such as accounts receivable or inventory and may incorporate a personal guarantee; however, some short-term loans may be made on an unsecured basis. In the case of loans secured by accounts receivable, the availability of funds for the repayment of these loans may be substantially dependent on the ability of the borrower to collect amounts due from its customers. Commercial real estate loans are viewed primarily as cash flow loans and secondarily as loans secured by real estate. Commercial real estate lending typically involves larger loan principal amounts and the repayment of these loans is generally dependent on the successful operation of the property securing the loan or the business conducted on the property securing the loan. Commercial real estate loans may be more adversely affected by conditions in the real estate markets, the general economy or fluctuations in interest rates. The properties securing the Company’s commercial real estate portfolio are diverse in terms of property type, and are monitored for concentrations of credit. Management monitors and evaluates commercial real estate loans based on collateral, cash flow and risk grade criteria. As a general rule, the Company avoids financing single purpose projects unless other underwriting factors are present to help mitigate risk. In addition, management tracks the level of owner-occupied commercial real estate loans versus non-owner Real Estate and Consumer With respect to residential loans that are secured by 1-4 loan-to-value 1-4 Mortgage Warehousing Horizon’s mortgage warehouse lending has specific mortgage companies as customers of Horizon Bank. Individual mortgage loans originated by these mortgage companies are funded as a secured borrowing with a pledge of collateral under Horizon’s agreement with the mortgage company. Each mortgage loan funded by Horizon undergoes an underwriting review by Horizon to the end investor guidelines and is assigned to Horizon until the loan is sold to the secondary market by the mortgage company. In addition, Horizon takes possession of each original note and forwards such note to the end investor once the mortgage company has sold the loan. At the time a loan is transferred to the secondary market, the mortgage company reacquires the loan under its option within the agreement. Due to the reacquire feature contained in the agreement, the transaction does not qualify as a sale and therefore is accounted for as a secured borrowing with a pledge of collateral pursuant to the agreement with the mortgage company. When the individual loan is sold to the end investor by the mortgage company, the proceeds from the sale of the loan are received by Horizon and used to pay off the loan balance with Horizon along with any accrued interest and any related fees. The remaining balance from the sale is forwarded to the mortgage company. These individual loans typically are sold by the mortgage company within 30 days and are seldom held more than 90 days. Interest income is accrued during this period and collected at the time each loan is sold. Fee income for each loan sold is collected when the loan is sold, and no costs are deferred due to the term between each loan funding and related payoff, which is typically less than 30 days. Based on the agreements with each mortgage company, at any time a mortgage company can reacquire from Horizon its outstanding loan balance on an individual mortgage and regain possession of the original note. Horizon also has the option to request that the mortgage company reacquire an individual mortgage. Should this occur, Horizon would return the original note and reassign the assignment of the mortgage to the mortgage company. Also, in the event that the end investor would not be able to honor the purchase commitment and the mortgage company would not be able to reacquire its loan on an individual mortgage, Horizon would be able to exercise its rights under the agreement. The following table shows the recorded investment of individual loan categories. September 30, 2018 Loan Interest Deferred Recorded Owner occupied real estate $ 583,261 $ 1,690 $ (1,693 ) $ 583,258 Non-owner 704,284 1,091 (2,128 ) 703,247 Residential spec homes 7,254 16 (2 ) 7,268 Development & spec land 43,889 127 (27 ) 43,989 Commercial and industrial 364,151 2,919 (407 ) 366,663 Total commercial 1,702,839 5,843 (4,257 ) 1,704,425 Residential mortgage 630,955 1,995 (2,099 ) 630,851 Residential construction 22,394 41 — 22,435 Mortgage warehouse 71,422 480 — 71,902 Total real estate 724,771 2,516 (2,099 ) 725,188 Direct installment 37,895 107 586 38,588 Indirect installment 303,579 696 — 304,275 Home equity 192,397 931 1,675 195,003 Total consumer 533,871 1,734 2,261 537,866 Total loans 2,961,481 10,093 (4,095 ) 2,967,479 Allowance for loan losses (17,798 ) — — (17,798 ) Net loans $ 2,943,683 $ 10,093 $ (4,095 ) $ 2,949,681 December 31, 2017 Loan Interest Deferred Recorded Owner occupied real estate $ 575,816 $ 1,511 $ (1,917 ) $ 575,410 Non-owner 683,901 1,138 (2,478 ) 682,561 Residential spec homes 16,591 63 (80 ) 16,574 Development & spec land 49,996 117 (579 ) 49,534 Commercial and industrial 349,085 2,572 (607 ) 351,050 Total commercial 1,675,389 5,401 (5,661 ) 1,675,129 Residential mortgage 593,108 1,776 (2,375 ) 592,509 Residential construction 16,027 39 — 16,066 Mortgage warehouse 94,508 480 — 94,988 Total real estate 703,643 2,295 (2,375 ) 703,563 Direct installment 36,737 113 552 37,402 Indirect installment 227,659 528 (168 ) 228,019 Home equity 194,860 889 1,359 197,108 Total consumer 459,256 1,530 1,743 462,529 Total loans 2,838,288 9,226 (6,293 ) 2,841,221 Allowance for loan losses (16,394 ) — — (16,394 ) Net loans $ 2,821,894 $ 9,226 $ (6,293 ) $ 2,824,827

Accounting for Certain Loans Ac

Accounting for Certain Loans Acquired in a Transfer	9 Months Ended
	Sep. 30, 2018
Transfers and Servicing [Abstract]
Accounting for Certain Loans Acquired in a Transfer	Note 5 – Accounting for Certain Loans Acquired in a Transfer The Company acquired loans in acquisitions and the transferred loans had evidence of deterioration of credit quality since origination and it was probable, at acquisition, that all contractually required payments would not be collected. Loans purchased with evidence of credit deterioration since origination and for which it is probable that all contractually required payments will not be collected are considered to be credit impaired. Evidence of credit quality deterioration as of the purchase date may include information such as past-due non-accrual loan-to-value 310-30) The carrying amounts of those loans included in the balance sheet amounts of loans receivable are as follows: September 30, 2018 Commercial Real Estate Consumer Outstanding Allowance Carrying Heartland $ 242 $ 185 $ — $ 427 $ — $ 427 Summit 1,463 575 — 2,038 — 2,038 Peoples 280 103 — 383 — 383 Kosciusko 769 199 — 968 — 968 LaPorte 811 962 29 1,802 106 1,696 Lafayette 3,245 — — 3,245 15 3,230 Wolverine 9,488 — — 9,488 — 9,488 Total $ 16,298 $ 2,024 $ 29 $ 18,351 $ 121 $ 18,230 December 31, 2017 Commercial Real Estate Consumer Outstanding Allowance Carrying Heartland $ 390 $ 229 $ — $ 619 $ — $ 619 Summit 3,653 870 — 4,523 — 4,523 Peoples 315 126 — 441 — 441 Kosciusko 838 403 — 1,241 — 1,241 LaPorte 1,034 1,004 33 2,071 — 2,071 Lafayette 4,271 — — 4,271 — 4,271 Wolverine 16,697 — — 16,697 — 16,697 Total $ 27,198 $ 2,632 $ 33 $ 29,863 $ — $ 29,863 Accretable yield, or income expected to be collected for the nine months ended September 30, is as follows: Nine Months Ended September 30, 2018 Beginning Additions Accretion Reclassification Disposals Ending Heartland $ 452 $ — $ (77 ) $ — $ (193 ) $ 182 Summit 147 — (48 ) — (9 ) 90 Kosciusko 386 — (60 ) — — 326 LaPorte 980 — (110 ) — (7 ) 863 Lafayette 933 — (229 ) — (16 ) 688 Wolverine 2,267 — (686 ) — (681 ) 900 Total $ 5,165 $ — $ (1,210 ) $ — $ (906 ) $ 3,049 Nine Months Ended September 30, 2017 Beginning Additions Accretion Reclassification Disposals Ending Heartland $ 557 $ — $ (99 ) $ — $ (6 ) $ 452 Summit 502 — (268 ) — (2 ) 232 Peoples 389 — (388 ) — (1 ) — Kosciusko 530 — (80 ) — (42 ) 408 LaPorte 1,479 — (194 ) — (264 ) 1,021 Total $ 3,457 $ — $ (1,029 ) $ — $ (315 ) $ 2,113 During the nine months ended September 30, 2018 and 2017 the Company increased the allowance for loan losses on purchased loans by a charge to the income statement of $121,000 and $71,000, respectively.

Allowance for Loan Losses

Allowance for Loan Losses	9 Months Ended
	Sep. 30, 2018
Receivables [Abstract]
Allowance for Loan Losses	Note 6 – Allowance for Loan Losses The historical loss experience is determined by portfolio segment and is based on the actual loss history experienced by the Company over the prior one to five years. Management believes using the highest of the one, two or five-year historical loss experience is an appropriate methodology in the current economic environment, as it captures loss rates that are comparable to the current period being analyzed. The actual allowance for loan loss activity is provided below. Three Months Ended Nine Months Ended September 30 September 30 2018 2017 2018 2017 (Unaudited) (Unaudited) (Unaudited) (Unaudited) Balance at beginning of the period $ 17,071 $ 15,027 $ 16,394 $ 14,837 Loans charged-off: Commercial Owner occupied real estate 97 12 110 12 Non-owner — 20 — 20 Residential spec homes — — — — Development & spec land — — — 1 Commercial and industrial 109 232 109 491 Total commercial 206 264 219 524 Real estate Residential mortgage 2 37 17 89 Residential construction — — — — Mortgage warehouse — — — — Total real estate 2 37 17 89 Consumer Direct installment 20 84 124 113 Indirect installment 432 254 1,302 862 Home equity 11 24 142 95 Total consumer 463 362 1,568 1,070 Total loans charged-off 671 663 1,804 1,683 Recoveries of loans previously charged-off: Commercial Owner occupied real estate 7 7 19 8 Non-owner 5 4 22 29 Residential spec homes 2 2 6 6 Development & spec land — — — — Commercial and industrial 13 93 71 234 Total commercial 27 106 118 277 Real estate Residential mortgage 4 13 15 35 Residential construction — — — — Mortgage warehouse — — — — Total real estate 4 13 15 35 Consumer Direct installment 10 249 42 281 Indirect installment 107 119 378 384 Home equity 74 25 277 85 Total consumer 191 393 697 750 Total loan recoveries 222 512 830 1,062 Net loans charged-off 449 151 974 621 Provision charged to operating expense Commercial 1,895 429 1,589 1,357 Real estate (243 ) 361 (612 ) (113 ) Consumer (476 ) (80 ) 1,401 126 Total provision charged to operating expense 1,176 710 2,378 1,370 Balance at the end of the period $ 17,798 $ 15,586 $ 17,798 $ 15,586 Certain loans are individually evaluated for impairment, and the Company’s general practice is to proactively charge down impaired loans to the fair value of the underlying collateral, which is the appraised value less estimated selling costs. Consistent with regulatory guidance, charge-offs on all loan segments are taken when specific loans, or portions thereof, are considered uncollectible. The Company’s policy is to promptly charge these loans off in the period the uncollectible loss is reasonably determined. For all loan portfolio segments except 1-4 charges-off charge-off The Company charges-off 1-4 1-4 charges-off open-end The following table presents the balance in the allowance for loan losses and the recorded investment in loans by portfolio segment and based on impairment analysis: September 30, 2018 Commercial Real Estate Mortgage Consumer Total Allowance For Loan Losses Ending allowance balance attributable to loans: Individually evaluated for impairment $ 924 $ — $ — $ — $ 924 Collectively evaluated for impairment 9,657 1,574 1,030 4,613 16,874 Loans acquired with deteriorated credit quality — — — — — Total ending allowance balance $ 10,581 $ 1,574 $ 1,030 $ 4,613 $ 17,798 Loans: Individually evaluated for impairment $ 8,358 $ — $ — $ — $ 8,358 Collectively evaluated for impairment 1,696,067 653,286 71,902 537,866 2,959,121 Loans acquired with deteriorated credit quality — — — — — Total ending loans balance $ 1,704,425 $ 653,286 $ 71,902 $ 537,866 $ 2,967,479 December 31, 2017 Commercial Real Estate Mortgage Warehousing Consumer Total Allowance For Loan Losses Ending allowance balance attributable to loans: Individually evaluated for impairment $ 184 $ — $ — $ — $ 184 Collectively evaluated for impairment 8,909 2,188 1,030 4,083 16,210 Loans acquired with deteriorated credit quality — — — — — Total ending allowance balance $ 9,093 $ 2,188 $ 1,030 $ 4,083 $ 16,394 Loans: Individually evaluated for impairment $ 7,187 $ — $ — $ — $ 7,187 Collectively evaluated for impairment 1,667,942 608,575 94,988 462,529 2,834,034 Loans acquired with deteriorated credit quality — — — — — Total ending loans balance $ 1,675,129 $ 608,575 $ 94,988 $ 462,529 $ 2,841,221

Non-performing Loans and Impair

Non-performing Loans and Impaired Loans	9 Months Ended
	Sep. 30, 2018
Text Block [Abstract]
Non-performing Loans and Impaired Loans	Note 7 – Non-performing The following table presents the non-accrual, September 30, 2018 Non-accrual Loans Past Due Over 90 Days Still Accruing Non-peforming TDRs Performing TDRs Total Non-performing Loans Commercial Owner occupied real estate $ 5,341 $ — $ — $ — $ 5,341 Non-owner 527 — 501 — 1,028 Residential spec homes — — — — — Development & spec land 71 — — — 71 Commercial and industrial 1,915 — — — 1,915 Total commercial 7,854 — 501 — 8,355 Real estate Residential mortgage 1,702 142 429 1,481 3,754 Residential construction — — — — — Mortgage warehouse — — — — — Total real estate 1,702 142 429 1,481 3,754 Consumer Direct installment 62 — — — 62 Indirect installment 608 60 — — 668 Home equity 1,191 — 147 349 1,687 Total consumer 1,861 60 147 349 2,417 Total $ 11,417 $ 202 $ 1,077 $ 1,830 $ 14,526 December 31, 2017 Non-accrual Loans Past Due Over 90 Days Still Accruing Non-peforming TDRs Performing TDRs Total Non-performing Loans Commercial Owner occupied real estate $ 4,877 $ — $ 11 $ 1 $ 4,889 Non-owner 115 — 440 — 555 Residential spec homes — — — — — Development & spec land 176 — — — 176 Commercial and industrial 1,734 — — — 1,734 Total commercial 6,902 — 451 1 7,354 Real estate Residential mortgage 3,693 — 351 1,450 5,494 Residential construction — — — 222 222 Mortgage warehouse — — — — — Total real estate 3,693 — 351 1,672 5,716 Consumer Direct installment 160 — — — 160 Direct installment purchased — — — — — Indirect installment 1,041 167 — — 1,208 Home equity 1,480 — 211 285 1,976 Total consumer 2,681 167 211 285 3,344 Total $ 13,276 $ 167 $ 1,013 $ 1,958 $ 16,414 Included in the $11.4 million of non-accrual non-performing From time to time, the Bank obtains information that may lead management to believe that the collection of payments may be doubtful on a particular loan. In recognition of this, it is management’s policy to convert the loan from an “earning asset” to a non-accruing non-accrual non-accrual non-accrual Non-accrual non-accrual A loan becomes impaired when, based on current information, it is probable that a creditor will be unable to collect all amounts due according to the contractual terms of the loan agreement. When a loan is classified as impaired, the degree of impairment must be recognized by estimating future cash flows from the debtor. The present value of these cash flows is computed at a discount rate based on the interest rate contained in the loan agreement. However, if a particular loan has a determinable market value for its collateral, the creditor may use that value. Also, if the loan is secured and considered collateral dependent, the creditor may use the fair value of the collateral. Interest income on loans individually classified as impaired is recognized on a cash basis after all past due and current principal payments have been made. Smaller-balance, homogeneous loans are evaluated for impairment in total. Such loans include residential first mortgage loans secured by 1–4 family residences, residential construction loans, automobile, home equity, second mortgage loans and mortgage warehouse loans. Commercial loans and mortgage loans secured by other properties are evaluated individually for impairment. When analysis of borrower operating results and financial condition indicate that underlying cash flows of a borrower’s business are not adequate to meet its debt service requirements, the loan is evaluated for impairment. Often this is associated with a delay or shortfall in payments of 30 days or more. Loans are generally moved to non-accrual Loans for which it is probable that the Company will not collect all principal and interest due according to contractual terms, including TDRs, are measured for impairment. Allowable methods for determining the amount of impairment include the three methods described above. The Company’s TDRs are considered impaired loans and included in the allowance methodology using the guidance for impaired loans. At September 30, 2018, the type of concessions the Company has made on restructured loans has been temporary rate reductions and/or reductions in monthly payments and there have been no restructured loans with modified recorded balances. Any modification to a loan that is a concession and is not in the normal course of lending is considered a restructured loan. A restructured loan is returned to accruing status after six consecutive payments but is still reported as TDR unless the loan bears interest at a market rate. As of September 30, 2018, the Company had $2.9 million in TDRs and $1.8 million were performing according to the restructured terms and $32,000 in TDRs were returned to accrual status during the first nine months of 2018. There were $70,000 specific reserves allocated to TDRs at September 30, 2018 based on the discounted cash flows or when appropriate the fair value of the collateral. The following table presents commercial loans individually evaluated for impairment by class of loan: September 30, 2018 Three Months Ended Nine Months Ended Unpaid Principal Balance Recorded Investment Allowance for Loan Loss Allocated Average Balance in Impaired Loans Cash/Accrual Interest Income Recognized Average Balance in Impaired Loans Cash/Accrual Interest Income Recognized With no recorded allowance Commercial Owner occupied real estate $ 4,496 $ 4,490 $ — $ 5,014 $ (25 ) $ 5,077 $ 71 Non-owner 841 857 — 936 (5 ) 1,119 5 Residential spec homes — — — — — — — Development & spec land 71 69 — 69 — 72 — Commercial and industrial 1,165 1,160 — 1,418 5 1,241 12 Total commercial 6,573 6,576 — 7,437 (25 ) 7,509 88 With an allowance recorded Commercial Owner occupied real estate 845 845 145 852 — 874 — Non-owner 187 187 30 189 4 178 4 Residential spec homes — — — — — — — Development & spec land — — — — — — — Commercial and industrial 750 750 749 750 4 750 4 Total commercial 1,782 1,782 924 1,791 8 1,802 8 Total $ 8,355 $ 8,358 $ 924 $ 9,228 $ (17 ) $ 9,311 $ 96 September 30, 2017 Three Months Ended Nine Months Ended Unpaid Principal Balance Recorded Investment Allowance for Loan Loss Allocated Average Balance in Impaired Loans Cash/Accrual Interest Income Recognized Average Balance in Impaired Loans Cash/Accrual Interest Income Recognized With no recorded allowance Commercial Owner occupied real estate $ 923 $ 934 $ — $ 1,167 $ 4 $ 1,033 $ 4 Non-owner 701 701 — 468 — 308 2 Residential spec homes — — — — — — — Development & spec land 102 102 — 222 — 230 — Commercial and industrial 1,707 1,714 — 2,066 3 1,071 19 Total commercial 3,433 3,451 — 3,923 7 2,642 25 With an allowance recorded Commercial Owner occupied real estate — — — — — — — Non-owner — — — — — — — Residential spec homes — — — — — — — Development & spec land — — — — — — — Commercial and industrial — — — — — — — Total commercial — — — — — — — Total $ 3,433 $ 3,451 $ — $ 3,923 $ 7 $ 2,642 $ 25 The following table presents the payment status by class of loan: September 30, 2018 30-59 Days Past Due 60-89 Days Past Due 90 Days or Greater Past Due Total Past Due Loans Not Past Due Total Commercial Owner occupied real estate $ 448 $ 58 $ — $ 506 $ 582,755 $ 583,261 Non-owner 370 34 — 404 703,880 704,284 Residential spec homes — — — — 7,254 7,254 Development & spec land — — — — 43,889 43,889 Commercial and industrial 1,388 343 — 1,731 362,420 364,151 Total commercial 2,206 435 — 2,641 1,700,198 1,702,839 Real estate Residential mortgage 2,642 156 142 2,940 628,015 630,955 Residential construction 123 — — 123 22,271 22,394 Mortgage warehouse — — — — 71,422 71,422 Total real estate 2,765 156 142 3,063 721,708 724,771 Consumer Direct installment 67 20 — 87 37,808 37,895 Indirect installment 1,025 313 60 1,398 302,181 303,579 Home equity 815 112 — 927 191,470 192,397 Total consumer 1,907 445 60 2,412 531,459 533,871 Total $ 6,878 $ 1,036 $ 202 $ 8,116 $ 2,953,365 $ 2,961,481 Percentage of total loans 0.23 % 0.03 % 0.01 % 0.27 % 99.73 % December 31, 2017 30-59 Past Due 60-89 Past Due 90 Days or Greater Past Due Total Past Due Loans Not Past Due Total Commercial Owner occupied real estate $ 1,613 $ 1,950 $ — $ 3,563 $ 572,253 $ 575,816 Non-owner 512 122 — 634 683,267 683,901 Residential spec homes — — — — 16,591 16,591 Development & spec land 31 — — 31 49,965 49,996 Commercial and industrial 520 1 — 521 348,564 349,085 Total commercial 2,676 2,073 — 4,749 1,670,640 1,675,389 Real estate Residential mortgage 1,248 49 — 1,297 591,811 593,108 Residential construction 63 — — 63 15,964 16,027 Mortgage warehouse — — — — 94,508 94,508 Total real estate 1,311 49 — 1,360 702,283 703,643 Consumer Direct installment 78 10 — 88 36,649 36,737 Indirect installment 1,859 244 167 2,270 225,389 227,659 Home equity 502 527 — 1,029 193,831 194,860 Total consumer 2,439 781 167 3,387 455,869 459,256 Total $ 6,426 $ 2,903 $ 167 $ 9,496 $ 2,828,792 $ 2,838,288 Percentage of total loans 0.23 % 0.10 % 0.01 % 0.33 % 99.67 % The entire balance of a loan is considered delinquent if the minimum payment contractually required to be made is not received by the specified due date. Horizon Bank’s processes for determining credit quality differ slightly depending on whether a new loan or a renewed loan is being underwritten, or whether an existing loan is being re-evaluated • For new and renewed commercial loans, the Bank’s Credit Department, which acts independently of the loan officer, assigns the credit quality grade to the loan. Loan grades for loans with an aggregate credit exposure that exceeds the authorities in the respective markets (ranging from $1,000,000 to $3,500,000) are validated by the Loan Committee, which is chaired by the Chief Commercial Banking Officer (CCBO). • Commercial loan officers are responsible for reviewing their loan portfolios and reporting any adverse material change to the CCBO or Loan Committee. When circumstances warrant a change in the credit quality grade, loan officers are required to notify the CCBO and the Credit Department of the change in the loan grade. Downgrades are accepted immediately by the CCBO, however, lenders must present their factual information to either the Loan Committee or the CCBO when recommending an upgrade. • The CCBO, or his designee, meets weekly with loan officers to discuss the status of past-due • Monthly, senior management meets with the Watch Committee, which reviews all of the past due, classified, and impaired loans and the relative trends of these assets. This committee also reviews the actions taken by management regarding foreclosure mitigation, loan extensions, troubled debt restructures, other real estate owned and personal property repossessions. The information reviewed in this meeting acts as a precursor for developing management’s analysis of the adequacy of the Allowance for Loan and Lease Losses. For residential real estate and consumer loans, Horizon uses a grading system based on delinquency. Loans that are 90 days or more past due, on non-accrual, non-accrual. Horizon Bank employs a nine-grade rating system to determine the credit quality of commercial loans. The first five grades represent acceptable quality, and the last four grades mirror the criticized and classified grades used by the bank regulatory agencies (special mention, substandard, doubtful, and loss). The loan grade definitions are detailed below. Risk Grade 1: Excellent (Pass) Loans secured by liquid collateral, such as certificates of deposit, reputable bank letters of credit, or other cash equivalents; loans that are guaranteed or otherwise backed by the full faith and credit of the United States government or an agency thereof, such as the Small Business Administration; or loans to any publicly held company with a current long-term debt rating of A or better. Risk Grade 2: Good (Pass) Loans to businesses that have strong financial statements containing an unqualified opinion from a CPA firm and at least three consecutive years of profits; loans supported by unaudited financial statements containing strong balance sheets, five consecutive years of profits, a five-year satisfactory relationship with the Bank, and key balance sheet and income statement trends that are either stable or positive; loans secured by publicly traded marketable securities where there is no impediment to liquidation; loans to individuals backed by liquid personal assets and unblemished credit history; or loans to publicly held companies with current long-term debt ratings of Baa or better. Risk Grade 3: Satisfactory (Pass) Loans supported by financial statements (audited or unaudited) that indicate average or slightly below average risk and having some deficiency or vulnerability to changing economic conditions; loans with some weakness but offsetting features of other support are readily available; loans that are meeting the terms of repayment, but which may be susceptible to deterioration if adverse factors are encountered. Loans may be graded Satisfactory when there is no recent information on which to base a current risk evaluation and the following conditions apply: • At inception, the loan was properly underwritten, did not • At inception, the loan was secured with collateral possessing a loan value adequate to protect the Bank from loss. • The loan has exhibited two or more years of satisfactory repayment with a reasonable reduction of the principal balance. • During the period that the loan has been outstanding, there has been no evidence of any credit weakness. Some examples of weakness include slow payment, lack of cooperation by the borrower, breach of loan covenants, or the borrower is in an industry known to be experiencing problems. If any of these credit weaknesses is observed, a lower risk grade may be warranted. Risk Grade 4 Satisfactory/Monitored: Loans in this category are considered to be of acceptable credit quality, but contain greater credit risk than Satisfactory loans. Borrower displays acceptable liquidity, leverage, and earnings performance within the Bank’s minimum underwriting guidelines. The level of risk is acceptable but conditioned on the proper level of loan officer supervision. Loans that normally fall into this grade include acquisition, construction and development loans and income producing properties that have not reached stabilization. Risk Grade 4W Management Watch: Loans in this category are considered to be of acceptable quality, but with above normal risk. Borrower displays potential indicators of weakness in the primary source of repayment resulting in a higher reliance on secondary sources of repayment. Balance sheet may exhibit weak liquidity and/or high leverage. There is inconsistent earnings performance without the ability to sustain adverse economic conditions. Borrower may be operating in a declining industry or the property type, as for a commercial real estate loan, may be unstablized, high risk or in decline. These loans require an increased level of loan officer supervision and monitoring to assure that any deterioration is addressed in a timely fashion. Risk Grade 5: Special Mention Loans which possess some credit deficiency or potential weakness which deserves close attention. Such loans pose an unwarranted financial risk that, if not corrected, could weaken the loan by adversely impacting the future repayment ability of the borrower. The key distinctions of a Special Mention classification are that (1) it is indicative of an unwarranted level of risk and (2) weaknesses are considered “potential,” not “defined,” impairments to the primary source of repayment. These loans may be to borrowers with adverse trends in financial performance, collateral value and/or marketability, or balance sheet strength. Risk Grade 6: Substandard One or more of the following characteristics may be exhibited in loans classified Substandard: • Loans which possess a defined credit weakness. The likelihood that a loan will be paid from the primary source of repayment is uncertain. Financial deterioration is under way and very close attention is warranted to ensure that the loan is collected without loss. • Loans are inadequately protected by the current net worth and paying capacity of the obligor. • The primary source of repayment is gone, and the Bank is forced to rely on a secondary source of repayment, such as collateral liquidation or guarantees. • Loans have a distinct possibility that the Bank will sustain some loss if deficiencies are not corrected. • Unusual courses of action are needed to maintain a high probability of repayment. • The borrower is not generating enough cash flow to repay loan principal; however, it continues to make interest payments. • The lender is forced into a subordinated or unsecured position due to flaws in documentation. • Loans have been restructured so that payment schedules, terms, and collateral represent concessions to the borrower when compared to the normal loan terms. • The lender is seriously contemplating foreclosure or legal action due to the apparent deterioration in the loan. • There is a significant deterioration in market conditions to which the borrower is highly vulnerable. Risk Grade 7: Doubtful One or more of the following characteristics may be present in loans classified Doubtful: • Loans have all of the weaknesses of those classified as Substandard. However, based on existing conditions, these weaknesses make full collection of principal highly improbable. • The primary source of repayment is gone, and there is considerable doubt as to the quality of the secondary source of repayment. • The possibility of loss is high but because of certain important pending factors which may strengthen the loan, loss classification is deferred until the exact status of repayment is known. Risk Grade 8: Loss Loans are considered uncollectible and of such little value that continuing to carry them as assets is not feasible. Loans will be classified Loss when it is neither practical nor desirable to defer writing off or reserving all or a portion of a basically worthless asset, even though partial recovery may be possible at some time in the future. The following table presents loans by credit grades. September 30, 2018 Pass Special Mention Substandard Doubtful Total Commercial Owner occupied real estate $ 563,429 $ 5,176 $ 14,656 $ — $ 583,261 Non-owner 692,995 5,903 5,386 — 704,284 Residential spec homes 7,254 — — — 7,254 Development & spec land 41,084 2,734 71 — 43,889 Commercial and industrial 350,617 5,021 8,513 — 364,151 Total commercial 1,655,379 18,834 28,626 — 1,702,839 Real estate Residential mortgage 627,343 — 3,612 — 630,955 Residential construction 22,394 — — — 22,394 Mortgage warehouse 71,422 — — — 71,422 Total real estate 721,159 — 3,612 — 724,771 Consumer Direct installment 37,833 — 62 — 37,895 Indirect installment 302,911 — 668 — 303,579 Home equity 190,710 — 1,687 — 192,397 Total consumer 531,454 — 2,417 — 533,871 Total $ 2,907,992 $ 18,834 $ 34,655 $ — $ 2,961,481 Percentage of total loans 98.19 % 0.64 % 1.17 % 0.00 % December 31, 2017 Pass Special Mention Substandard Doubtful Total Commercial Owner occupied real estate $ 548,992 $ 8,622 $ 18,202 $ — $ 575,816 Non-owner 675,030 3,864 5,007 — 683,901 Residential spec homes 16,591 — — — 16,591 Development & spec land 48,884 886 226 — 49,996 Commercial and industrial 327,970 7,448 13,667 — 349,085 Total commercial 1,617,467 20,820 37,102 — 1,675,389 Real estate Residential mortgage 587,614 — 5,494 — 593,108 Residential construction 15,805 — 222 — 16,027 Mortgage warehouse 94,508 — — — 94,508 Total real estate 697,927 — 5,716 — 703,643 Consumer Direct installment 36,577 — 160 — 36,737 Indirect installment 226,451 — 1,208 — 227,659 Home equity 192,884 — 1,976 — 194,860 Total consumer 455,912 — 3,344 — 459,256 Total $ 2,771,306 $ 20,820 $ 46,162 $ — $ 2,838,288 Percentage of total loans 97.64 % 0.73 % 1.63 % 0.00 %

Repurchase Agreements

Repurchase Agreements	9 Months Ended
	Sep. 30, 2018
Text Block [Abstract]
Repurchase Agreements	Note 8 – Repurchase Agreements The Company transfers various securities to customers in exchange for cash at the end of each business day and agrees to acquire the securities at the end of the next business day for the cash exchanged plus interest. The process is repeated at the end of each business day until the agreement is terminated. The securities underlying the agreement remained under the Bank’s control. The following table shows repurchase agreements accounted for as secured borrowings: September 30, 2018 Remaining Contractual Maturity of the Agreements Overnight and Continuous Up to one year One to three years Three to five years Five to ten years Beyond ten years Total Repurchase Agreements and repurchase-to-maturity Repurchase Agreements $ 56,629 $ — $ — $ — $ — $ — $ 56,629 Securities pledged for Repurchase Agreements Federal agency collateralized mortgage obligations $ 32,535 $ — $ — $ — $ — $ — $ 32,535 Federal agency mortgage-backed pools 29,467 — — — — — 29,467 Total $ 62,002 $ — $ — $ — $ — $ — $ 62,002

Derivative Financial Instrument

Derivative Financial Instruments	9 Months Ended
	Sep. 30, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Financial Instruments	Note 9 – Derivative Financial Instruments Cash Flow Hedges – The Company assumed additional interest rate swap agreements as the result of the LaPorte acquisition in July 2016. The agreements provide for the Company to receive interest from the counterparty at one month LIBOR and to pay interest to the counterparty at a weighted average fixed rate of 2.31% on a notional amount of $30.0 million at September 30, 2018 and December 31, 2017. Under the agreements, the Company pays or receives the net interest amount monthly, with the monthly settlements included in interest expense. On July 20, 2018, the Company entered into an interest rate swap agreement for an additional portion of its floating rate debt. The agreement provides for the Company to receive interest from the counterparty at one month LIBOR and to pay interest to the counterparty at a rate of 2.81% on a notional amount of $50.0 million at September 30, 2018. Under the agreement, the Company pays or receives the net interest amount monthly, with the monthly settlements included in interest expense. Management has designated the interest rate swap agreement as a cash flow hedging instrument. For derivative instruments that are designated and qualify as a cash flow hedge, the effective portion of the gain or loss on the derivative is reported as a component of other comprehensive income and reclassified into earnings in the same period or periods during which the hedged transaction affects earnings. Gains and losses on the derivative representing either hedge ineffectiveness or hedge components excluded from the assessment of effectiveness are recognized in current earnings. At September 30, 2018, the Company’s cash flow hedge was effective and is not expected to have a significant impact on the Company’s net income over the next 12 months. Fair Value Hedges Fair value hedges are intended to reduce the interest rate risk associated with the underlying hedged item. The Company enters into fixed rate loan agreements as part of its lending policy. To mitigate the risk of changes in fair value based on fluctuations in interest rates, the Company has entered into interest rate swap agreements on individual loans, converting the fixed rate loans to a variable rate. For derivative instruments that are designated and qualify as a fair value hedge, the gain or loss on the derivative as well as the offsetting gain or loss on the hedged item attributable to the hedged risk are recognized in current earnings. At September 30, 2018, the Company’s fair value hedges were effective and are not expected to have a significant impact on the Company’s net income over the next 12 months. The change in fair value of both the hedge instruments and the underlying loan agreements are recorded as gains or losses in interest income. The fair value hedges are considered to be highly effective and any hedge ineffectiveness was deemed not material. The notional amounts of the loan agreements being hedged were $205.8 million at September 30, 2018 and $154.6 million at December 31, 2017. Other Derivative Instruments The Company enters into non-hedging The change in fair value of both the forward sale commitments and commitments to originate mortgage loans were recorded and the net gains or losses included in the Company’s gain on sale of loans. The following tables summarize the fair value of derivative financial instruments utilized by Horizon: Asset Derivatives Liability Derivatives September 30, 2018 September 30, 2018 Balance Sheet Location Fair Value Balance Sheet Location Fair Value Derivatives designated as hedging instruments Interest rate contracts Other Assets $ 4,918 Loans $ 4,918 Interest rate contracts Other Assets 24 Other liabilities — Total derivatives desginated as hedging instruments 4,942 4,918 Derivatives not designated as hedging instruments Mortgage loan contracts Other assets 231 Other liabilities 92 Total derivatives not designated as hedging instruments 231 92 Total derivatives $ 5,173 $ 5,010 Asset Derivatives Liability Derivatives December 31, 2017 December 31, 2017 Balance Sheet Location Fair Value Balance Sheet Location Fair Value Derivatives designated as hedging instruments Interest rate contracts Loans $ — Loans $ 811 Interest rate contracts Other Assets 811 Other liabilities 1,728 Total derivatives desginated as hedging instruments 811 2,539 Derivatives not designated as hedging instruments Mortgage loan contracts Other assets 143 Other liabilities 3 Total derivatives not designated as hedging instruments 143 3 Total derivatives $ 954 $ 2,542 The effect of the derivative instruments on the condensed consolidated statements of income for the three and nine-month periods ending September 30 is as follows: Amount of Loss Recognized in Other Comprehensive Income on Derivative (Effective Portion) Three Months Ended Nine Months Ended September 30, 2018 September 30, 2017 September 30, 2018 September 30, 2017 Derivatives in cash flow hedging relationship Interest rate contracts $ 505 $ 193 $ 1,384 $ 483 FASB Accounting Standards Codification (“ASC”) Topic 820-10-20 820-10-55 Location of gain recognized on Amount of Gain (Loss) Recognized on Derivative Three Months Ended Nine Months Ended September 30, 2018 September 30, 2017 September 30, 2018 September 30, 2017 Derivative in fair value hedging relationship Interest rate contracts Interest income - loans $ 2,768 $ (4 ) $ 574 $ 423 Interest rate contracts Interest income - loans (2,768 ) 4 (574 ) (423 ) Total $ — $ — $ — $ — Location of gain recognized on Amount of Gain (Loss) Recognized on Derivative Three Months Ended Nine Months Ended September 30, 2018 September 30, 2017 September 30, 2018 September 30, 2017 Derivative not designated as hedging relationship Mortgage contracts Other income - gain on sale of $ 112 $ (112 ) $ 195 $ (324 )

Disclosures about Fair Value of

Disclosures about Fair Value of Assets and Liabilities	9 Months Ended
	Sep. 30, 2018
Fair Value Disclosures [Abstract]
Disclosures about Fair Value of Assets and Liabilities	Note 10 – Disclosures about Fair Value of Assets and Liabilities The Fair Value Measurements topic of the FASB ASC defines fair value, establishes a framework for measuring fair value and expands disclosures about fair value measurements. There are three levels of inputs that may be used to measure fair value: Level 1 Quoted prices in active markets for identical assets or liabilities Level 2 Observable inputs other than Level 1 prices, such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities Level 3 Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities Following is a description of the valuation methodologies used for instruments measured at fair value on a recurring basis and recognized in the accompanying condensed consolidated financial statements, as well as the general classification of such instruments pursuant to the valuation hierarchy. There have been no significant changes in the valuation techniques during the period ended September 30, 2018. For assets classified within Level 3 of the fair value hierarchy, the process used to develop the reported fair value is described below. Available for sale securities When quoted market prices are available in an active market, securities are classified within Level 1 of the valuation hierarchy. If quoted market prices are not available, then fair values are estimated by using pricing models, quoted prices of securities with similar characteristics or discounted cash flows. Level 2 securities include U.S. Treasury and federal agency securities, state and municipal securities, federal agency collateralized mortgage obligations and mortgage-backed pools and corporate notes. Level 2 securities are valued by a third party pricing service commonly used in the banking industry utilizing observable inputs. Observable inputs include dealer quotes, market spreads, cash flow analysis, the U.S. Treasury yield curve, trade execution data, market consensus prepayment spreads and available credit information and the bond’s terms and conditions. The pricing provider utilizes evaluated pricing models that vary based on asset class. These models incorporate available market information including quoted prices of securities with similar characteristics and, because many fixed-income securities do not trade on a daily basis, apply available information through processes such as benchmark curves, benchmarking of like securities, sector grouping, and matrix pricing. In addition, model processes, such as an option adjusted spread model, is used to develop prepayment and interest rate scenarios for securities with prepayment features. Hedged loans Certain fixed rate loans have been converted to variable rate loans by entering into interest rate swap agreements. The fair value of those fixed rate loans is based on discounting the estimated cash flows using interest rates determined by the respective interest rate swap agreement. Loans are classified within Level 2 of the valuation hierarchy based on the unobservable inputs used. Interest rate swap agreements The fair value of the Company’s interest rate swap agreements is estimated by a third party using inputs that are primarily unobservable including a yield curve, adjusted for liquidity and credit risk, contracted terms and discounted cash flow analysis, and therefore, are classified within Level 2 of the valuation hierarchy. The following table presents the fair value measurements of assets and liabilities recognized in the accompanying condensed consolidated financial statements measured at fair value on a recurring basis and the level within the FASB ASC fair value hierarchy in which the fair value measurements fall at the following: September 30, 2018 Fair Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Available for sale securities U.S. Treasury and federal agencies $ 16,572 $ — $ 16,572 $ — State and municipal 156,675 — 156,675 — Federal agency collateralized mortgage obligations 172,671 — 172,671 — Federal agency mortgage-backed pools 185,975 — 185,975 — Corporate notes 10,412 — 10,412 — Total available for sale securities 542,305 — 542,305 — Hedged loans 205,778 — 205,778 — Forward sale commitments 231 — 231 — Interest rate swap agreements 4,942 — 4,942 — Commitments to originate loans (92 ) — (92 ) — December 31, 2017 Fair Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Available for sale securities U.S. Treasury and federal agencies $ 19,052 $ — $ 19,052 $ — State and municipal 149,564 — 149,564 — Federal agency collateralized mortgage obligations 130,365 — 130,365 — Federal agency mortgage-backed pools 208,657 — 208,657 — Private labeled mortgage-backed pools 1,642 — 1,642 — Corporate notes 385 — 385 — Total available for sale securities 509,665 — 509,665 — Hedged loans 154,575 — 154,575 — Forward sale commitments 143 — 143 — Interest rate swap agreements (917 ) — (917 ) — Commitments to originate loans (3 ) — (3 ) — Realized gains and losses included in net income for the periods are reported in the condensed consolidated statements of income as follows: Three Months Ended Nine Months Ended September 30, 2018 September 30, 2017 September 30, 2018 September 30, 2017 Non-interest Total gains and losses from: Hedged loans $ 364 $ (4 ) $ 4,108 $ 423 Fair value interest rate swap agreements (364 ) 4 (4,108 ) (423 ) Derivative loan commitments (184 ) (112 ) (1 ) (324 ) $ (184 ) $ (112 ) $ (1 ) $ (324 ) Certain other assets are measured at fair value on a non-recurring Fair Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) September 30, 2018 Impaired loans $ 7,431 $ — $ — $ 7,431 Mortgage servicing rights 12,044 — — 12,044 December 31, 2017 Impaired loans $ 6,957 $ — $ — $ 6,957 Mortgage servicing rights 11,602 — — 11,602 Impaired (collateral dependent): If the impaired loan is identified as collateral dependent, then the fair value method of measuring the amount of impairment is utilized. This method requires obtaining a current independent appraisal of the collateral and applying a discount factor to the value. Impaired loans that are collateral dependent are classified within Level 3 of the fair value hierarchy when impairment is determined using the fair value method. Mortgage Servicing Rights (MSRs): month-end The following table presents qualitative information about unobservable inputs used in recurring and non-recurring September 30, 2018 Fair Valuation Technique Unobservable Inputs Range Impaired loans $ 7,431 Collateral based measurement Discount to reflect current market conditions and ultimate collectability 0%-100% (11.1%) Mortgage servicing rights 12,044 Discounted cash flows Discount rate, Constant prepayment rate, Probability of default 10.3%-11.3% 9.3%-14.9% (9.5%), 0.1%-0.8% December 31, 2017 Fair Valuation Technique Unobservable Inputs Range (Weighted Average) Impaired loans $ 6,957 Collateral based measurement Discount to reflect current market conditions and ultimate collectability 0%-46.8% Mortgage servicing rights 11,602 Discounted cash flows Discount rate, Constant prepayment rate, Probability of default 9.6%-10.8% 9.2%-27.7% (10.5%), 0%-1.5%

Fair Value of Financial Instrum

Fair Value of Financial Instruments	9 Months Ended
	Sep. 30, 2018
Fair Value Disclosures [Abstract]
Fair Value of Financial Instruments	Note 11 – Fair Value of Financial Instruments The estimated fair value amounts of the Company’s financial instruments were determined using available market information, current pricing information applicable to Horizon and various valuation methodologies. Where market quotations were not available, considerable management judgment was involved in the determination of estimated fair values. Therefore, the estimated fair value of financial instruments shown below may not be representative of the amounts at which they could be exchanged in a current or future transaction. Due to the inherent uncertainties of expected cash flows of financial instruments, the use of alternate valuation assumptions and methods could have a significant effect on the estimated fair value amounts. The estimated fair values of financial instruments, as shown below, are not intended to reflect the estimated liquidation or market value of Horizon taken as a whole. The disclosed fair value estimates are limited to Horizon’s significant financial instruments at September 30, 2018 and December 31, 2017. These include financial instruments recognized as assets and liabilities on the condensed consolidated balance sheet as well as certain off-balance The following methods and assumptions were used to estimate the fair value of each class of financial instrument: Cash and Due from Banks Held-to-Maturity Loans Held for Sale Net Loans FHLB and FRB Stock Interest Receivable/Payable Deposits Borrowings Subordinated Debentures Commitments to Extend Credit and Standby Letters of Credit The following table presents estimated fair values of the Company’s financial instruments and the level within the fair value hierarchy in which the fair value measurements fall (unaudited). September 30, 2018 Carrying Amount Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Assets Cash and due from banks $ 69,697 $ 69,697 $ — $ — Investment securities, held to maturity 223,848 — 219,158 — Loans held for sale 1,980 — — 1,980 Loans (excluding loan level hedges), net 2,733,810 — — 2,610,426 Stock in FHLB 18,073 — 18,073 — Interest receivable 13,999 — 13,999 — Liabilities Non-interest $ 621,475 $ 621,475 $ — $ — Interest bearing deposits 2,507,079 — 2,373,715 — Borrowings 477,719 — 471,265 — Subordinated debentures 37,791 — 35,811 — Interest payable 1,688 — 1,688 — December 31, 2017 Carrying Amount Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Assets Cash and due from banks $ 76,441 $ 76,441 $ — $ — Investment securities, held to maturity 200,448 — 201,085 — Loans held for sale 3,094 — — 3,094 Loans (excluding loan level hedges), net 2,661,026 — — 2,585,879 Stock in FHLB 18,105 — 18,105 — Interest receivable 16,244 — 16,244 — Liabilities Non-interest $ 601,805 $ 601,805 $ — $ — Interest bearing deposits 2,279,198 — 2,156,487 — Borrowings 564,157 — 560,057 — Subordinated debentures 37,653 — 35,994 — Interest payable 886 — 886 —

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income	9 Months Ended
	Sep. 30, 2018
Equity [Abstract]
Accumulated Other Comprehensive Income	Note 12 – Accumulated Other Comprehensive Income September 30 December 31 Unrealized loss on securities available for sale $ (16,481 ) $ (3,937 ) Unamortized gain on securities held to maturity, previously transferred from AFS 47 200 Unrealized loss on derivative instruments 24 (1,728 ) Tax effect 3,447 1,914 Total accumulated other comprehensive loss $ (12,963 ) $ (3,551 )

Regulatory Capital

Regulatory Capital	9 Months Ended
	Sep. 30, 2018
Banking and Thrift [Abstract]
Regulatory Capital	Note 13 – Regulatory Capital Horizon and the Bank are subject to various regulatory capital requirements administered by the federal banking agencies and are assigned to a capital category. Failure to meet the minimum regulatory capital requirements can initiate certain mandatory and possible additional discretionary actions by regulators, which if undertaken, could have a direct material effect on the Bank’s financial statements. Under capital adequacy guidelines and the regulatory framework for prompt corrective actions, the Bank must meet specific capital guidelines involving quantitative measures of the Bank’s assets, liabilities, and certain off-balance-sheet Quantitative measures established by regulation to ensure capital adequacy require the Bank to maintain minimum amounts and ratios of total and Tier I capital (as defined in the regulations) to risk-weighted assets (as defined), and of Tier I capital (as defined) to average assets (as defined), or leverage ratio. Basel III rules require the Bank to maintain minimum amounts and ratios of common equity Tier I capital (as defined in the regulation) to risk-weighted assets (as defined). Additionally, under Basel III rules, the decision was made to opt-out To be categorized as well capitalized, the Bank must maintain minimum Total risk-based, Tier I risk-based, common equity Tier I risk-based and Tier I leverage ratios as set forth in the table below. As of September 30, 2018 and December 31, 2017, the Bank met all capital adequacy requirements to be considered well capitalized. There have been no conditions or events since the end of the third quarter of 2018 that management believes have changed the Bank’s classification as well capitalized. There is no threshold for well-capitalized status for bank holding companies. Horizon and the Bank’s actual and required capital ratios as of September 30, 2018 and December 31, 2017 were as follows: Actual Required for Capital 1 Adequacy Purposes Required For Capital 1 Adequacy Purposes with Capital Buffer Well Capitalized Under 1 Corrective Action Amount Ratio Amount Ratio Amount Ratio Amount Ratio September 30, 2018 Total capital 1 Consolidated $ 417,728 13.31 % $ 251,097 8.00 % $ 290,331 9.25 % N/A N/A Bank 397,610 12.66 % 251,262 8.00 % 290,522 9.25 % $ 314,078 10.00 % Tier 1 capital 1 Consolidated 399,885 12.74 % 188,323 6.00 % 227,557 7.25 % N/A N/A Bank 379,767 12.09 % 188,447 6.00 % 227,706 7.25 % 251,262 8.00 % Common equity tier 1 capital 1 Consolidated 361,422 11.52 % 141,242 4.50 % 180,476 5.75 % N/A N/A Bank 379,767 12.09 % 141,335 4.50 % 180,595 5.75 % 204,150 6.50 % Tier 1 capital 1 Consolidated 399,885 10.05 % 159,098 4.00 % 159,098 4.00 % N/A N/A Bank 379,767 9.53 % 159,405 4.00 % 159,405 4.00 % 199,257 5.00 % December 31, 2017 Total capital 1 Consolidated $ 384,800 12.91 % $ 238,543 8.00 % $ 275,816 9.25 % N/A N/A Bank 382,788 12.85 % 238,386 8.00 % 275,634 9.25 % $ 297,982 10.00 % Tier 1 capital 1 Consolidated 368,355 12.35 % 178,907 6.00 % 216,180 7.25 % N/A N/A Bank 366,343 12.29 % 178,790 6.00 % 216,038 7.25 % 238,386 8.00 % Common equity tier 1 capital 1 Consolidated 329,892 11.06 % 134,181 4.50 % 171,454 5.75 % N/A N/A Bank 366,343 12.29 % 134,092 4.50 % 171,340 5.75 % 193,689 6.50 % Tier 1 capital 1 Consolidated 368,355 9.92 % 148,503 4.00 % 148,503 4.00 % N/A N/A Bank 366,343 9.89 % 148,116 4.00 % 148,116 4.00 % 185,145 5.00 %

Future Accounting Matters

Future Accounting Matters	9 Months Ended
	Sep. 30, 2018
Accounting Changes and Error Corrections [Abstract]
Future Accounting Matters	Note 14 – Future Accounting Matters Financial Accounting Standards Board (FASB) Accounting Standards Update (ASU) No. 2018-13, Fair Value Measurement (Topic 820): Disclosure Framework – Changes to the Disclosure Requirements for Fair Value Measurement The FASB has issued ASU No. 2018-13, Fair Value Measurement (Topic 820): Disclosure Framework – Changes to the Disclosure Requirements for Fair Value Measurement Removals Modifications Additions The guidance is effective for all entities for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2019. The amendments on changes in unrealized gains and losses, the range and weighted average of significant unobservable inputs used to develop Level 3 fair value measurements, and the narrative description of measurement uncertainty should all be applied prospectively for only the most recent interim or annual period presented in the initial year of adoption. All other amendments should be applied retrospectively to all periods presented upon their effective date. Early adoption is permitted. An entity is permitted to early adopt any removed or modified disclosures upon issuance of ASU No. 2018-13 2018-13 FASB ASU No. 2017-12, Derivatives and Hedging (Topic 815), Targeted Improvements to Accounting for Hedging Activities The FASB has issued ASU No. 2017-12, Derivatives and Hedging (Topic 815), Targeted Improvements to Accounting for Hedging Activities FASB ASU No. 2017-04, Intangibles – Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment The FASB has issued ASU No. 2017-04, Intangibles – Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment. FASB ASU No. 2016-13, Financial Instruments – Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments The FASB has issued ASU No. 2016-13, Financial Instruments – Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments. available-for-sale one-time FASB Accounting Standards Updates No. 2016-02, Leases (Topic 842) The FASB has issued Accounting Standards Update (ASU) No. 2016-02, Leases.

General Litigation

General Litigation	9 Months Ended
	Sep. 30, 2018
Commitments and Contingencies Disclosure [Abstract]
General Litigation	Note 15 – General Litigation The Company is subject to claims and lawsuits that arise primarily in the ordinary course of business. It is the opinion of management that the disposition or ultimate resolution of such claims and lawsuits will not have a material adverse effect on the consolidated financial position, results of operation and cash flows of the Company.

Business Combinations

Business Combinations	9 Months Ended
	Sep. 30, 2018
Subsequent Events [Abstract]
Business Combinations	Note 16 – Business Combinations On October 29, 2018, Horizon entered into an Agreement and Plan of Merger (the “Merger Agreement”) providing for Horizon’s acquisition of Salin Bancshares, Inc. (“Salin”). Pursuant to the Merger Agreement, Salin will merge with and into Horizon, with Horizon surviving the merger (the “Merger”), and Salin Bank and Trust Company, a wholly-owned subsidiary of Salin, will merge with and into Horizon Bank, with Horizon Bank as the surviving bank. The boards of directors of each of Horizon and Salin have approved the Merger and the Merger Agreement. Subject to the approval of the Merger by Salin shareholders, regulatory approvals and other closing conditions, the parties anticipate completing the Merger during the first quarter of 2019. In connection with the Merger, shareholders of Salin will receive fixed consideration of 23,907.5 shares of Horizon common stock and $84,417.17 in cash for each share of Salin common stock. Based on the closing price of Horizon’s common stock on October 26, 2018 of $16.95 per share, the transaction value for the shares of common stock is approximately $135.3 million. The Merger Agreement also provides for certain termination rights for both Horizon and Salin, and further provides that upon termination of the Merger Agreement under certain circumstances, Salin will be obligated to pay Horizon a termination fee. As of September 30, 2018, Salin had total assets of approximately $918.4 million and total deposits of approximately $752.1 million and total loans of approximately $595.7 million.

Accounting Policies (Policies)

Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 2018
Accounting Policies [Abstract]
Earnings Per Share	Basic earnings per share is computed by dividing net income available to common shareholders (net income less dividend requirements for preferred stock and accretion of preferred stock discount) by the weighted-average number of common shares outstanding. Diluted earnings per share reflect the potential dilution that could occur if securities or other contracts to issue common stock were exercised or converted into common stock. The following table shows computation of basic and diluted earnings per share. Three Months Ended Nine Months Ended September 30 September 30 2018 2017 2018 2017 Basic earnings per share Net income $ 13,065 $ 8,171 $ 39,984 $ 25,467 Weighted average common shares outstanding (1) 38,365,379 33,870,240 38,340,012 33,489,681 Basic earnings per share $ 0.34 $ 0.24 $ 1.04 $ 0.76 Diluted earnings per share Net income available to common shareholders $ 13,065 $ 8,171 $ 39,984 $ 25,467 Weighted average common shares outstanding (1) 38,365,379 33,870,240 38,340,012 33,489,681 Effect of dilutive securities: Restricted stock 47,603 55,123 43,926 50,686 Stock options 121,988 147,546 119,465 143,329 Weighted average common shares outstanding 38,534,970 34,072,909 38,503,403 33,683,696 $ 0.34 $ 0.24 $ 1.04 $ 0.75 (1) Adjusted for 3:2 stock split on June 15, 2018 There were no shares for the three and nine months ended September 30, 2018 and 2017, respectively, which were included in the computation of diluted earnings per share because they were non-dilutive. Horizon has share-based employee compensation plans, which are described in the notes to the financial statements included in the December 31, 2017 Annual Report on Form 10-K.
Adoption of New Accounting Standards	Adoption of New Accounting Standards Financial Accounting Standards Board (FASB) Accounting Standards Update (ASU) No. 2018-02, Income Statement – Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income The FASB has issued ASU No. 2018-02, Income Statement – Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income 2018-02 FASB ASU No. 2016-01, Financial Instruments – Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities The FASB has issued ASU No. 2016-01, Financial Instruments – Overall (Subtopic 825-10): not-for-profit The new guidance makes targeted improvements to existing U.S. GAAP by: • Requiring equity investments (except those accounted for under the equity method of accounting, or those that result in consolidation of the investee) to be measured at fair value with changes in fair value recognized in net income; • Requiring public business entities to use the exit price notion when measuring the fair value of financial instruments for disclosure purposes; • Requiring separate presentation of financial assets and financial liabilities by measurement category and form of financial asset (i.e., securities or loans and receivables) on the balance sheet or the accompanying notes to the financial statements; • Eliminating the requirement to disclose the fair value of financial instruments measured at amortized cost for organizations that are not public business entities; • Eliminating the requirement for public business entities to disclose the method(s) and significant assumptions used to estimate the fair value that is required to be disclosed for financial instruments measured at amortized cost on the balance sheet; and • Requiring a reporting organization to present separately in other comprehensive income the portion of the total change in the fair value of a liability resulting from a change in the instrument-specific credit risk (also referred to as “own credit”) when the organization has elected to measure the liability at fair value in accordance with the fair value option for financial instruments. The new guidance is effective for public companies for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. The new guidance permits early adoption of the own credit provision. In addition, the new guidance permits early adoption of the provision that exempts private companies and not-for-profit 2016-01 FASB ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606) The FASB has issued ASU No. 2014-09 Revenue from Contracts with Customers (Topic 606). 2014-09 In May 2016, the FASB issued ASU No. 2016-12, Revenue from Contracts with Customers (Topic 606): Narrow-Scope Improvements and Practical Expedients In December 2016, the FASB issued ASU No. 2016-20, Revenue from Contracts with Customers (Topic 606): Technical Corrections and Improvements No. 2014-09 No. 2014-09. No. 2014-09.
Revenue Recognition	Revenue Recognition Accounting Standards Codification 606, “ Revenue from Contracts with Customers” non-interest • Service charges and fees on deposit accounts – these include general service fees charged for deposit account maintenance and activity and transaction-based fees charged for certain services, such as debit card, wire transfer or overdraft activities. Revenue is recognized when the performance obligation is completed, which is generally after a transaction is completed or monthly for account maintenance services. • Fiduciary activities – this includes periodic fees due from trust and wealth management customers for managing the customers’ financial assets. Fees are charged based on a standard agreement and are recognized as they are earned.
Reclassifications	Reclassifications Certain reclassifications have been made to the 2017 condensed consolidated financial statements to be comparable to 2018. These reclassifications had no effect on net income.

Accounting Policies (Tables)

Accounting Policies (Tables)	9 Months Ended
	Sep. 30, 2018
Accounting Policies [Abstract]
Summary of Computation of Basic and Diluted Earnings Per Share	The following table shows computation of basic and diluted earnings per share. Three Months Ended Nine Months Ended September 30 September 30 2018 2017 2018 2017 Basic earnings per share Net income $ 13,065 $ 8,171 $ 39,984 $ 25,467 Weighted average common shares outstanding (1) 38,365,379 33,870,240 38,340,012 33,489,681 Basic earnings per share $ 0.34 $ 0.24 $ 1.04 $ 0.76 Diluted earnings per share Net income available to common shareholders $ 13,065 $ 8,171 $ 39,984 $ 25,467 Weighted average common shares outstanding (1) 38,365,379 33,870,240 38,340,012 33,489,681 Effect of dilutive securities: Restricted stock 47,603 55,123 43,926 50,686 Stock options 121,988 147,546 119,465 143,329 Weighted average common shares outstanding 38,534,970 34,072,909 38,503,403 33,683,696 $ 0.34 $ 0.24 $ 1.04 $ 0.75 (1) Adjusted for 3:2 stock split on June 15, 2018

Acquisitions (Tables)

Acquisitions (Tables)	9 Months Ended
	Sep. 30, 2018
Pro Forma Result of Comparable Prior Reporting Period	The following schedule includes pro-forma Three Months Ended Nine Months Ended September 30 September 30 2017 2017 Summary of Operations: Net Interest Income $ 32,038 $ 62,164 Provision for Loan Losses (1,090 ) (1,337 ) Net Interest Income after Provision for Loan Losses 33,128 63,501 Non-interest 8,662 16,565 Non-interest 26,714 51,398 Income before Income Taxes 15,076 28,668 Income Tax Expense 4,549 8,412 Net Income 10,527 20,256 Net Income Available to Common Shareholders $ 10,527 $ 20,256 Basic Earnings per Share $ 0.32 $ 0.61 Diluted Earnings per Share $ 0.31 $ 0.60
Wolverine Bancorp Inc [Member]
Schedule of Purchase Price of Assets Acquired and Liabilities Assumed	Based on preliminary valuations of the fair value of tangible and intangible assets acquired and liabilities assumed, which are based on estimates and assumptions that are subject to change, the final purchase price for the Wolverine acquisition is allocated as follows: Assets Liabilities Cash and due from banks $ 44,450 Deposits Non-interest $ 25,221 Loans NOW accounts 8,026 Commercial 276,167 Savings and money market 129,044 Residential mortgage 30,603 Certificates of deposit 94,688 Consumer 3,897 Total deposits 256,979 Total loans 310,667 Premises and equipment, net 2,941 Borrowings 36,970 FRB and FHLB stock 2,700 Interest payable 214 Goodwill 26,827 Other liabilities 6,154 Core deposit intangible 2,024 Interest receivable 584 Other assets 3,897 Total assets purchased $ 394,090 Total liabilities assumed $ 300,317 Common shares issued $ 62,111 Cash paid 31,662 Total estimated purchase price $ 93,773
Schedule of Acquired Loans Accounted for in Accordance with ASC 310-30	The following table details the acquired loans that are accounted for in accordance with ASC 310-30 Contractually required principal and interest at acquisition $ 21,912 Contractual cash flows not expected to be collected (nonaccretable differences) 1,832 Expected cash flows at acquisition 20,080 Interest component of expected cash flows (accretable discount) 2,267 Fair value of acquired loans accounted for under ASC 310-30 $ 17,813
Lafayette Community Bancorp [Member]
Schedule of Purchase Price of Assets Acquired and Liabilities Assumed	Based on preliminary valuations of the fair value of tangible and intangible assets acquired and liabilities assumed, which are based on assumptions that are subject to change, the purchase price for the Lafayette acquisition is detailed in the following table. Assets Liabilities Cash and due from banks $ 24,846 Deposits Investment securities, available for sale 6 Non-interest $ 34,990 NOW accounts 30,174 Loans Savings and money market 53,663 Commercial 116,258 Certificates of deposit 32,520 Residential mortgage 12,761 Total deposits 151,347 Consumer 5,280 Total loans 134,299 Premises and equipment, net 7,818 Interest payable 42 FHLB stock 395 Other liabilities 990 Goodwill 15,408 Core deposit intangible 2,085 Interest receivable 338 Other assets 1,649 Total assets purchased $ 186,844 Total liabilities assumed $ 152,379 Common shares issued $ 30,044 (1) Cash paid 4,421 Total estimated purchase price $ 34,465 (1) This includes $955,000 of common shares previously held by Horizon.
Schedule of Acquired Loans Accounted for in Accordance with ASC 310-30	The following table details an estimate of the acquired loans that are accounted for in accordance with ASC 310-30 Contractually required principal and interest at acquisition $ 6,128 Contractual cash flows not expected to be collected (nonaccretable differences) 1,326 Expected cash flows at acquisition 4,802 Interest component of expected cash flows (accretable discount) 933 Fair value of acquired loans accounted for under ASC 310-30 $ 3,869

Securities (Tables)

Securities (Tables)	9 Months Ended
	Sep. 30, 2018
Investments, Debt and Equity Securities [Abstract]
Fair Value of Securities	The fair value of securities is as follows: September 30, 2018 Amortized Gross Gross Fair Available for sale U.S. Treasury and federal agencies $ 17,036 $ — $ (464 ) $ 16,572 State and municipal 159,812 57 (3,194 ) 156,675 Federal agency collateralized mortgage obligations 178,069 — (5,398 ) 172,671 Federal agency mortgage-backed pools 193,461 16 (7,502 ) 185,975 Corporate notes 10,408 103 (99 ) 10,412 Total available for sale investment securities $ 558,786 $ 176 $ (16,657 ) $ 542,305 Held to maturity State and municipal $ 204,619 $ 1,062 $ (5,257 ) $ 200,424 Federal agency collateralized mortgage obligations 5,262 3 (182 ) 5,083 Federal agency mortgage-backed pools 13,967 27 (343 ) 13,651 Total held to maturity investment securities $ 223,848 $ 1,092 $ (5,782 ) $ 219,158 December 31, 2017 Amortized Gross Gross Fair Available for sale U.S. Treasury and federal agencies $ 19,277 $ — $ (225 ) $ 19,052 State and municipal 148,045 2,189 (670 ) 149,564 Federal agency collateralized mortgage obligations 132,871 45 (2,551 ) 130,365 Federal agency mortgage-backed pools 211,487 155 (2,985 ) 208,657 Private labeled mortgage-backed pools 1,650 — (8 ) 1,642 Corporate notes 272 113 — 385 Total available for sale investment securities $ 513,602 $ 2,502 $ (6,439) $ 509,665 Held to maturity State and municipal $ 179,836 $ 3,493 $ (2,932 ) $ 180,397 Federal agency collateralized mortgage obligations 5,734 17 (69 ) 5,682 Federal agency mortgage-backed pools 14,878 216 (88 ) 15,006 Total held to maturity investment securities $ 200,448 $ 3,726 $ (3,089 ) $ 201,085
Amortized Cost and Fair Value of Securities Available for Sale and Held to Maturity	The amortized cost and fair value of securities available for sale and held to maturity at September 30, 2018 and December 31, 2017, by contractual maturity, are shown below. Expected maturities will differ from contractual maturities because issuers may have the right to call or prepay obligations with or without call or prepayment penalties. September 30, 2018 December 31, 2017 Amortized Fair Amortized Fair Available for sale Within one year $ 19,958 $ 19,861 $ 13,347 $ 13,326 One to five years 34,822 34,019 40,468 40,193 Five to ten years 96,035 94,103 50,473 51,156 After ten years 36,441 35,676 63,306 64,326 187,256 183,659 167,594 169,001 Federal agency collateralized mortgage obligations 178,069 172,671 132,871 130,365 Federal agency mortgage-backed pools 193,461 185,975 211,487 208,657 Private labeled mortgage-backed pools — — 1,650 1,642 Total available for sale investment securities $ 558,786 $ 542,305 $ 513,602 $ 509,665 Held to maturity Within one year $ 5,646 $ 5,628 $ 1,948 $ 1,934 One to five years 48,383 48,788 40,603 41,531 Five to ten years 102,816 101,199 89,801 91,249 After ten years 47,774 44,809 47,484 45,683 204,619 200,424 179,836 180,397 Federal agency collateralized mortgage obligations 5,262 5,083 5,734 5,682 Federal agency mortgage-backed pools 13,967 13,651 14,878 15,006 Total held to maturity investment securities $ 223,848 $ 219,158 $ 200,448 $ 201,085
Gross Unrealized Losses and Fair Value of Company's Investments	The following table shows the gross unrealized losses and the fair value of the Company’s investments, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position. September 30, 2018 Less than 12 Months 12 Months or More Total Fair Unrealized Fair Unrealized Fair Unrealized Investment Securities U.S. Treasury and federal agencies $ 7,763 $ (137 ) $ 8,809 $ (327 ) $ 16,572 $ (464 ) State and municipal 215,439 (3,691 ) 56,725 (4,760 ) 272,164 (8,451 ) Federal agency collateralized mortgage obligations 72,495 (830 ) 102,498 (4,750 ) 174,993 (5,580 ) Federal agency mortgage-backed pools 48,696 (1,270 ) 145,787 (6,575 ) 194,483 (7,845 ) Corporate notes 8,124 (99) — — 8,124 (99 ) Total temporarily impaired securities $ 352,517 $ (6,027 ) $ 313,819 $ (16,412 ) $ 666,336 $ (22,439 ) December 31, 2017 Less than 12 Months 12 Months or More Total Fair Unrealized Fair Unrealized Fair Unrealized Investment Securities U.S. Treasury and federal agencies $ 15,882 $ (180 ) $ 2,870 $ (45 ) $ 18,752 $ (225 ) State and municipal 54,312 (2,758 ) 30,691 (844 ) 85,003 (3,602 ) Federal agency collateralized mortgage obligations 54,006 (589 ) 73,462 (2,031 ) 127,468 (2,620 ) Federal agency mortgage-backed pools 103,926 (1,019 ) 86,846 (2,054 ) 190,772 (3,073 ) Private labeled mortgage-backed pools 1,642 (8 ) — — 1,642 (8 ) Total temporarily impaired securities $ 229,768 $ (4,554 ) $ 193,869 $ (4,974 ) $ 423,637 $ (9,528 )
Sales of Securities Available for Sale	Information regarding security proceeds, gross gains and gross losses are presented below. Three Months Ended Nine Months Ended September 30 September 30 2018 2017 2018 2017 Sales of securities available for sale Proceeds $ 7,485 $ 387 $ 17,321 $ 5,490 Gross gains — 6 37 151 Gross losses (122 ) — (148 ) (113 )

Loans (Tables)

Loans (Tables)	9 Months Ended
	Sep. 30, 2018
Amounts of Loans	September 30 December 31 2018 2017 Commercial Working capital and equipment $ 764,422 $ 720,477 Real estate, including agriculture 850,364 880,861 Tax exempt 46,171 36,324 Other 37,625 32,066 Total 1,698,582 1,669,728 Real estate 1-4 643,396 599,217 Other 7,854 7,543 Total 651,250 606,760 Consumer Auto 316,925 244,003 Recreation 13,339 8,728 Real estate/home improvement 39,104 37,052 Home equity 161,398 165,240 Unsecured 4,017 3,479 Other 1,349 2,497 Total 536,132 460,999 Mortgage warehouse 71,422 94,508 Total loans 2,957,386 2,831,995 Allowance for loan losses (17,798 ) (16,394 ) Loans, net $ 2,939,588 $ 2,815,601
Recorded Investment of Individual Loan Categories	The following table shows the recorded investment of individual loan categories. September 30, 2018 Loan Interest Deferred Recorded Owner occupied real estate $ 583,261 $ 1,690 $ (1,693 ) $ 583,258 Non-owner 704,284 1,091 (2,128 ) 703,247 Residential spec homes 7,254 16 (2 ) 7,268 Development & spec land 43,889 127 (27 ) 43,989 Commercial and industrial 364,151 2,919 (407 ) 366,663 Total commercial 1,702,839 5,843 (4,257 ) 1,704,425 Residential mortgage 630,955 1,995 (2,099 ) 630,851 Residential construction 22,394 41 — 22,435 Mortgage warehouse 71,422 480 — 71,902 Total real estate 724,771 2,516 (2,099 ) 725,188 Direct installment 37,895 107 586 38,588 Indirect installment 303,579 696 — 304,275 Home equity 192,397 931 1,675 195,003 Total consumer 533,871 1,734 2,261 537,866 Total loans 2,961,481 10,093 (4,095 ) 2,967,479 Allowance for loan losses (17,798 ) — — (17,798 ) Net loans $ 2,943,683 $ 10,093 $ (4,095 ) $ 2,949,681 December 31, 2017 Loan Interest Deferred Recorded Owner occupied real estate $ 575,816 $ 1,511 $ (1,917 ) $ 575,410 Non-owner 683,901 1,138 (2,478 ) 682,561 Residential spec homes 16,591 63 (80 ) 16,574 Development & spec land 49,996 117 (579 ) 49,534 Commercial and industrial 349,085 2,572 (607 ) 351,050 Total commercial 1,675,389 5,401 (5,661 ) 1,675,129 Residential mortgage 593,108 1,776 (2,375 ) 592,509 Residential construction 16,027 39 — 16,066 Mortgage warehouse 94,508 480 — 94,988 Total real estate 703,643 2,295 (2,375 ) 703,563 Direct installment 36,737 113 552 37,402 Indirect installment 227,659 528 (168 ) 228,019 Home equity 194,860 889 1,359 197,108 Total consumer 459,256 1,530 1,743 462,529 Total loans 2,838,288 9,226 (6,293 ) 2,841,221 Allowance for loan losses (16,394 ) — — (16,394 ) Net loans $ 2,821,894 $ 9,226 $ (6,293 ) $ 2,824,827
Loans Purchased With Evidence of Credit Deterioration [Member]
Amounts of Loans	The carrying amounts of those loans included in the balance sheet amounts of loans receivable are as follows: September 30, 2018 Commercial Real Estate Consumer Outstanding Allowance Carrying Heartland $ 242 $ 185 $ — $ 427 $ — $ 427 Summit 1,463 575 — 2,038 — 2,038 Peoples 280 103 — 383 — 383 Kosciusko 769 199 — 968 — 968 LaPorte 811 962 29 1,802 106 1,696 Lafayette 3,245 — — 3,245 15 3,230 Wolverine 9,488 — — 9,488 — 9,488 Total $ 16,298 $ 2,024 $ 29 $ 18,351 $ 121 $ 18,230 December 31, 2017 Commercial Real Estate Consumer Outstanding Allowance Carrying Heartland $ 390 $ 229 $ — $ 619 $ — $ 619 Summit 3,653 870 — 4,523 — 4,523 Peoples 315 126 — 441 — 441 Kosciusko 838 403 — 1,241 — 1,241 LaPorte 1,034 1,004 33 2,071 — 2,071 Lafayette 4,271 — — 4,271 — 4,271 Wolverine 16,697 — — 16,697 — 16,697 Total $ 27,198 $ 2,632 $ 33 $ 29,863 $ — $ 29,863

Accounting for Certain Loans _2

Accounting for Certain Loans Acquired in a Transfer (Tables)	9 Months Ended
	Sep. 30, 2018
Transfers and Servicing [Abstract]
Accretable Yield or Income Expected to be Collected	Accretable yield, or income expected to be collected for the nine months ended September 30, is as follows: Nine Months Ended September 30, 2018 Beginning Additions Accretion Reclassification Disposals Ending Heartland $ 452 $ — $ (77 ) $ — $ (193 ) $ 182 Summit 147 — (48 ) — (9 ) 90 Kosciusko 386 — (60 ) — — 326 LaPorte 980 — (110 ) — (7 ) 863 Lafayette 933 — (229 ) — (16 ) 688 Wolverine 2,267 — (686 ) — (681 ) 900 Total $ 5,165 $ — $ (1,210 ) $ — $ (906 ) $ 3,049 Nine Months Ended September 30, 2017 Beginning Additions Accretion Reclassification Disposals Ending Heartland $ 557 $ — $ (99 ) $ — $ (6 ) $ 452 Summit 502 — (268 ) — (2 ) 232 Peoples 389 — (388 ) — (1 ) — Kosciusko 530 — (80 ) — (42 ) 408 LaPorte 1,479 — (194 ) — (264 ) 1,021 Total $ 3,457 $ — $ (1,029 ) $ — $ (315 ) $ 2,113

Allowance for Loan Losses (Tabl

Allowance for Loan Losses (Tables)	9 Months Ended
	Sep. 30, 2018
Receivables [Abstract]
Allowance for Loan Losses	The historical loss experience is determined by portfolio segment and is based on the actual loss history experienced by the Company over the prior one to five years. Management believes using the highest of the one, two or five-year historical loss experience is an appropriate methodology in the current economic environment, as it captures loss rates that are comparable to the current period being analyzed. The actual allowance for loan loss activity is provided below. Three Months Ended Nine Months Ended September 30 September 30 2018 2017 2018 2017 (Unaudited) (Unaudited) (Unaudited) (Unaudited) Balance at beginning of the period $ 17,071 $ 15,027 $ 16,394 $ 14,837 Loans charged-off: Commercial Owner occupied real estate 97 12 110 12 Non-owner — 20 — 20 Residential spec homes — — — — Development & spec land — — — 1 Commercial and industrial 109 232 109 491 Total commercial 206 264 219 524 Real estate Residential mortgage 2 37 17 89 Residential construction — — — — Mortgage warehouse — — — — Total real estate 2 37 17 89 Consumer Direct installment 20 84 124 113 Indirect installment 432 254 1,302 862 Home equity 11 24 142 95 Total consumer 463 362 1,568 1,070 Total loans charged-off 671 663 1,804 1,683 Recoveries of loans previously charged-off: Commercial Owner occupied real estate 7 7 19 8 Non-owner 5 4 22 29 Residential spec homes 2 2 6 6 Development & spec land — — — — Commercial and industrial 13 93 71 234 Total commercial 27 106 118 277 Real estate Residential mortgage 4 13 15 35 Residential construction — — — — Mortgage warehouse — — — — Total real estate 4 13 15 35 Consumer Direct installment 10 249 42 281 Indirect installment 107 119 378 384 Home equity 74 25 277 85 Total consumer 191 393 697 750 Total loan recoveries 222 512 830 1,062 Net loans charged-off 449 151 974 621 Provision charged to operating expense Commercial 1,895 429 1,589 1,357 Real estate (243 ) 361 (612 ) (113 ) Consumer (476 ) (80 ) 1,401 126 Total provision charged to operating expense 1,176 710 2,378 1,370 Balance at the end of the period $ 17,798 $ 15,586 $ 17,798 $ 15,586
Allowance for Loan Losses and Recorded Investment in Loans by Portfolio Segment	The following table presents the balance in the allowance for loan losses and the recorded investment in loans by portfolio segment and based on impairment analysis: September 30, 2018 Commercial Real Estate Mortgage Consumer Total Allowance For Loan Losses Ending allowance balance attributable to loans: Individually evaluated for impairment $ 924 $ — $ — $ — $ 924 Collectively evaluated for impairment 9,657 1,574 1,030 4,613 16,874 Loans acquired with deteriorated credit quality — — — — — Total ending allowance balance $ 10,581 $ 1,574 $ 1,030 $ 4,613 $ 17,798 Loans: Individually evaluated for impairment $ 8,358 $ — $ — $ — $ 8,358 Collectively evaluated for impairment 1,696,067 653,286 71,902 537,866 2,959,121 Loans acquired with deteriorated credit quality — — — — — Total ending loans balance $ 1,704,425 $ 653,286 $ 71,902 $ 537,866 $ 2,967,479 December 31, 2017 Commercial Real Estate Mortgage Warehousing Consumer Total Allowance For Loan Losses Ending allowance balance attributable to loans: Individually evaluated for impairment $ 184 $ — $ — $ — $ 184 Collectively evaluated for impairment 8,909 2,188 1,030 4,083 16,210 Loans acquired with deteriorated credit quality — — — — — Total ending allowance balance $ 9,093 $ 2,188 $ 1,030 $ 4,083 $ 16,394 Loans: Individually evaluated for impairment $ 7,187 $ — $ — $ — $ 7,187 Collectively evaluated for impairment 1,667,942 608,575 94,988 462,529 2,834,034 Loans acquired with deteriorated credit quality — — — — — Total ending loans balance $ 1,675,129 $ 608,575 $ 94,988 $ 462,529 $ 2,841,221

Non-performing Loans and Impa_2

Non-performing Loans and Impaired Loans (Tables)	9 Months Ended
	Sep. 30, 2018
Text Block [Abstract]
Non-accrual, Loans Past Due Over 90 Days Still on Accrual, and Troubled Debt Restructured ("TDRs") by Class of Loans	The following table presents the non-accrual, September 30, 2018 Non-accrual Loans Past Due Over 90 Days Still Accruing Non-peforming TDRs Performing TDRs Total Non-performing Loans Commercial Owner occupied real estate $ 5,341 $ — $ — $ — $ 5,341 Non-owner 527 — 501 — 1,028 Residential spec homes — — — — — Development & spec land 71 — — — 71 Commercial and industrial 1,915 — — — 1,915 Total commercial 7,854 — 501 — 8,355 Real estate Residential mortgage 1,702 142 429 1,481 3,754 Residential construction — — — — — Mortgage warehouse — — — — — Total real estate 1,702 142 429 1,481 3,754 Consumer Direct installment 62 — — — 62 Indirect installment 608 60 — — 668 Home equity 1,191 — 147 349 1,687 Total consumer 1,861 60 147 349 2,417 Total $ 11,417 $ 202 $ 1,077 $ 1,830 $ 14,526 December 31, 2017 Non-accrual Loans Past Due Over 90 Days Still Accruing Non-peforming TDRs Performing TDRs Total Non-performing Loans Commercial Owner occupied real estate $ 4,877 $ — $ 11 $ 1 $ 4,889 Non-owner 115 — 440 — 555 Residential spec homes — — — — — Development & spec land 176 — — — 176 Commercial and industrial 1,734 — — — 1,734 Total commercial 6,902 — 451 1 7,354 Real estate Residential mortgage 3,693 — 351 1,450 5,494 Residential construction — — — 222 222 Mortgage warehouse — — — — — Total real estate 3,693 — 351 1,672 5,716 Consumer Direct installment 160 — — — 160 Direct installment purchased — — — — — Indirect installment 1,041 167 — — 1,208 Home equity 1,480 — 211 285 1,976 Total consumer 2,681 167 211 285 3,344 Total $ 13,276 $ 167 $ 1,013 $ 1,958 $ 16,414
Commercial Loans Individually Evaluated for Impairment by Class of Loan	The following table presents commercial loans individually evaluated for impairment by class of loan: September 30, 2018 Three Months Ended Nine Months Ended Unpaid Principal Balance Recorded Investment Allowance for Loan Loss Allocated Average Balance in Impaired Loans Cash/Accrual Interest Income Recognized Average Balance in Impaired Loans Cash/Accrual Interest Income Recognized With no recorded allowance Commercial Owner occupied real estate $ 4,496 $ 4,490 $ — $ 5,014 $ (25 ) $ 5,077 $ 71 Non-owner 841 857 — 936 (5 ) 1,119 5 Residential spec homes — — — — — — — Development & spec land 71 69 — 69 — 72 — Commercial and industrial 1,165 1,160 — 1,418 5 1,241 12 Total commercial 6,573 6,576 — 7,437 (25 ) 7,509 88 With an allowance recorded Commercial Owner occupied real estate 845 845 145 852 — 874 — Non-owner 187 187 30 189 4 178 4 Residential spec homes — — — — — — — Development & spec land — — — — — — — Commercial and industrial 750 750 749 750 4 750 4 Total commercial 1,782 1,782 924 1,791 8 1,802 8 Total $ 8,355 $ 8,358 $ 924 $ 9,228 $ (17 ) $ 9,311 $ 96 September 30, 2017 Three Months Ended Nine Months Ended Unpaid Principal Balance Recorded Investment Allowance for Loan Loss Allocated Average Balance in Impaired Loans Cash/Accrual Interest Income Recognized Average Balance in Impaired Loans Cash/Accrual Interest Income Recognized With no recorded allowance Commercial Owner occupied real estate $ 923 $ 934 $ — $ 1,167 $ 4 $ 1,033 $ 4 Non-owner 701 701 — 468 — 308 2 Residential spec homes — — — — — — — Development & spec land 102 102 — 222 — 230 — Commercial and industrial 1,707 1,714 — 2,066 3 1,071 19 Total commercial 3,433 3,451 — 3,923 7 2,642 25 With an allowance recorded Commercial Owner occupied real estate — — — — — — — Non-owner — — — — — — — Residential spec homes — — — — — — — Development & spec land — — — — — — — Commercial and industrial — — — — — — — Total commercial — — — — — — — Total $ 3,433 $ 3,451 $ — $ 3,923 $ 7 $ 2,642 $ 25
Payment Status by Class of Loan	The following table presents the payment status by class of loan: September 30, 2018 30-59 Days Past Due 60-89 Days Past Due 90 Days or Greater Past Due Total Past Due Loans Not Past Due Total Commercial Owner occupied real estate $ 448 $ 58 $ — $ 506 $ 582,755 $ 583,261 Non-owner 370 34 — 404 703,880 704,284 Residential spec homes — — — — 7,254 7,254 Development & spec land — — — — 43,889 43,889 Commercial and industrial 1,388 343 — 1,731 362,420 364,151 Total commercial 2,206 435 — 2,641 1,700,198 1,702,839 Real estate Residential mortgage 2,642 156 142 2,940 628,015 630,955 Residential construction 123 — — 123 22,271 22,394 Mortgage warehouse — — — — 71,422 71,422 Total real estate 2,765 156 142 3,063 721,708 724,771 Consumer Direct installment 67 20 — 87 37,808 37,895 Indirect installment 1,025 313 60 1,398 302,181 303,579 Home equity 815 112 — 927 191,470 192,397 Total consumer 1,907 445 60 2,412 531,459 533,871 Total $ 6,878 $ 1,036 $ 202 $ 8,116 $ 2,953,365 $ 2,961,481 Percentage of total loans 0.23 % 0.03 % 0.01 % 0.27 % 99.73 % December 31, 2017 30-59 Past Due 60-89 Past Due 90 Days or Greater Past Due Total Past Due Loans Not Past Due Total Commercial Owner occupied real estate $ 1,613 $ 1,950 $ — $ 3,563 $ 572,253 $ 575,816 Non-owner 512 122 — 634 683,267 683,901 Residential spec homes — — — — 16,591 16,591 Development & spec land 31 — — 31 49,965 49,996 Commercial and industrial 520 1 — 521 348,564 349,085 Total commercial 2,676 2,073 — 4,749 1,670,640 1,675,389 Real estate Residential mortgage 1,248 49 — 1,297 591,811 593,108 Residential construction 63 — — 63 15,964 16,027 Mortgage warehouse — — — — 94,508 94,508 Total real estate 1,311 49 — 1,360 702,283 703,643 Consumer Direct installment 78 10 — 88 36,649 36,737 Indirect installment 1,859 244 167 2,270 225,389 227,659 Home equity 502 527 — 1,029 193,831 194,860 Total consumer 2,439 781 167 3,387 455,869 459,256 Total $ 6,426 $ 2,903 $ 167 $ 9,496 $ 2,828,792 $ 2,838,288 Percentage of total loans 0.23 % 0.10 % 0.01 % 0.33 % 99.67 %
Loans by Credit Grades	The following table presents loans by credit grades. September 30, 2018 Pass Special Mention Substandard Doubtful Total Commercial Owner occupied real estate $ 563,429 $ 5,176 $ 14,656 $ — $ 583,261 Non-owner 692,995 5,903 5,386 — 704,284 Residential spec homes 7,254 — — — 7,254 Development & spec land 41,084 2,734 71 — 43,889 Commercial and industrial 350,617 5,021 8,513 — 364,151 Total commercial 1,655,379 18,834 28,626 — 1,702,839 Real estate Residential mortgage 627,343 — 3,612 — 630,955 Residential construction 22,394 — — — 22,394 Mortgage warehouse 71,422 — — — 71,422 Total real estate 721,159 — 3,612 — 724,771 Consumer Direct installment 37,833 — 62 — 37,895 Indirect installment 302,911 — 668 — 303,579 Home equity 190,710 — 1,687 — 192,397 Total consumer 531,454 — 2,417 — 533,871 Total $ 2,907,992 $ 18,834 $ 34,655 $ — $ 2,961,481 Percentage of total loans 98.19 % 0.64 % 1.17 % 0.00 % December 31, 2017 Pass Special Mention Substandard Doubtful Total Commercial Owner occupied real estate $ 548,992 $ 8,622 $ 18,202 $ — $ 575,816 Non-owner 675,030 3,864 5,007 — 683,901 Residential spec homes 16,591 — — — 16,591 Development & spec land 48,884 886 226 — 49,996 Commercial and industrial 327,970 7,448 13,667 — 349,085 Total commercial 1,617,467 20,820 37,102 — 1,675,389 Real estate Residential mortgage 587,614 — 5,494 — 593,108 Residential construction 15,805 — 222 — 16,027 Mortgage warehouse 94,508 — — — 94,508 Total real estate 697,927 — 5,716 — 703,643 Consumer Direct installment 36,577 — 160 — 36,737 Indirect installment 226,451 — 1,208 — 227,659 Home equity 192,884 — 1,976 — 194,860 Total consumer 455,912 — 3,344 — 459,256 Total $ 2,771,306 $ 20,820 $ 46,162 $ — $ 2,838,288 Percentage of total loans 97.64 % 0.73 % 1.63 % 0.00 %

Repurchase Agreements (Tables)

Repurchase Agreements (Tables)	9 Months Ended
	Sep. 30, 2018
Text Block [Abstract]
Summary of Repurchase Agreements Accounted as Secured Borrowings	The following table shows repurchase agreements accounted for as secured borrowings: September 30, 2018 Remaining Contractual Maturity of the Agreements Overnight and Continuous Up to one year One to three years Three to five years Five to ten years Beyond ten years Total Repurchase Agreements and repurchase-to-maturity Repurchase Agreements $ 56,629 $ — $ — $ — $ — $ — $ 56,629 Securities pledged for Repurchase Agreements Federal agency collateralized mortgage obligations $ 32,535 $ — $ — $ — $ — $ — $ 32,535 Federal agency mortgage-backed pools 29,467 — — — — — 29,467 Total $ 62,002 $ — $ — $ — $ — $ — $ 62,002

Derivative Financial Instrume_2

Derivative Financial Instruments (Tables)	9 Months Ended
	Sep. 30, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Fair Value of Derivative Financial Instruments	The following tables summarize the fair value of derivative financial instruments utilized by Horizon: Asset Derivatives Liability Derivatives September 30, 2018 September 30, 2018 Balance Sheet Location Fair Value Balance Sheet Location Fair Value Derivatives designated as hedging instruments Interest rate contracts Other Assets $ 4,918 Loans $ 4,918 Interest rate contracts Other Assets 24 Other liabilities — Total derivatives desginated as hedging instruments 4,942 4,918 Derivatives not designated as hedging instruments Mortgage loan contracts Other assets 231 Other liabilities 92 Total derivatives not designated as hedging instruments 231 92 Total derivatives $ 5,173 $ 5,010 Asset Derivatives Liability Derivatives December 31, 2017 December 31, 2017 Balance Sheet Location Fair Value Balance Sheet Location Fair Value Derivatives designated as hedging instruments Interest rate contracts Loans $ — Loans $ 811 Interest rate contracts Other Assets 811 Other liabilities 1,728 Total derivatives desginated as hedging instruments 811 2,539 Derivatives not designated as hedging instruments Mortgage loan contracts Other assets 143 Other liabilities 3 Total derivatives not designated as hedging instruments 143 3 Total derivatives $ 954 $ 2,542
Effect of Derivative Instruments on Condensed Consolidated Statements of Income Derivative in Cash Flow Hedging Relationship	The effect of the derivative instruments on the condensed consolidated statements of income for the three and nine-month periods ending September 30 is as follows: Amount of Loss Recognized in Other Comprehensive Income on Derivative (Effective Portion) Three Months Ended Nine Months Ended September 30, 2018 September 30, 2017 September 30, 2018 September 30, 2017 Derivatives in cash flow hedging relationship Interest rate contracts $ 505 $ 193 $ 1,384 $ 483
Effect of Derivative Instruments on Consolidated Statement of Income Derivative in Fair Value Hedging Relationship	Location of gain recognized on Amount of Gain (Loss) Recognized on Derivative Three Months Ended Nine Months Ended September 30, 2018 September 30, 2017 September 30, 2018 September 30, 2017 Derivative in fair value hedging relationship Interest rate contracts Interest income - loans $ 2,768 $ (4 ) $ 574 $ 423 Interest rate contracts Interest income - loans (2,768 ) 4 (574 ) (423 ) Total $ — $ — $ — $ — Location of gain recognized on Amount of Gain (Loss) Recognized on Derivative Three Months Ended Nine Months Ended September 30, 2018 September 30, 2017 September 30, 2018 September 30, 2017 Derivative not designated as hedging relationship Mortgage contracts Other income - gain on sale of $ 112 $ (112 ) $ 195 $ (324 )

Disclosures about Fair Value _2

Disclosures about Fair Value of Assets and Liabilities (Tables)	9 Months Ended
	Sep. 30, 2018
Fair Value Disclosures [Abstract]
Fair Value Measurements of Assets and Liabilities Recognized on a Recurring Basis	The following table presents the fair value measurements of assets and liabilities recognized in the accompanying condensed consolidated financial statements measured at fair value on a recurring basis and the level within the FASB ASC fair value hierarchy in which the fair value measurements fall at the following: September 30, 2018 Fair Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Available for sale securities U.S. Treasury and federal agencies $ 16,572 $ — $ 16,572 $ — State and municipal 156,675 — 156,675 — Federal agency collateralized mortgage obligations 172,671 — 172,671 — Federal agency mortgage-backed pools 185,975 — 185,975 — Corporate notes 10,412 — 10,412 — Total available for sale securities 542,305 — 542,305 — Hedged loans 205,778 — 205,778 — Forward sale commitments 231 — 231 — Interest rate swap agreements 4,942 — 4,942 — Commitments to originate loans (92 ) — (92 ) — December 31, 2017 Fair Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Available for sale securities U.S. Treasury and federal agencies $ 19,052 $ — $ 19,052 $ — State and municipal 149,564 — 149,564 — Federal agency collateralized mortgage obligations 130,365 — 130,365 — Federal agency mortgage-backed pools 208,657 — 208,657 — Private labeled mortgage-backed pools 1,642 — 1,642 — Corporate notes 385 — 385 — Total available for sale securities 509,665 — 509,665 — Hedged loans 154,575 — 154,575 — Forward sale commitments 143 — 143 — Interest rate swap agreements (917 ) — (917 ) — Commitments to originate loans (3 ) — (3 ) —
Realized Gains and Losses Included in Net Income for Periods in Condensed Consolidated Statements of Income	Realized gains and losses included in net income for the periods are reported in the condensed consolidated statements of income as follows: Three Months Ended Nine Months Ended September 30, 2018 September 30, 2017 September 30, 2018 September 30, 2017 Non-interest Total gains and losses from: Hedged loans $ 364 $ (4 ) $ 4,108 $ 423 Fair value interest rate swap agreements (364 ) 4 (4,108 ) (423 ) Derivative loan commitments (184 ) (112 ) (1 ) (324 ) $ (184 ) $ (112 ) $ (1 ) $ (324 )
Other Assets Measured at Fair Value on Non-recurring Basis	Certain other assets are measured at fair value on a non-recurring Fair Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) September 30, 2018 Impaired loans $ 7,431 $ — $ — $ 7,431 Mortgage servicing rights 12,044 — — 12,044 December 31, 2017 Impaired loans $ 6,957 $ — $ — $ 6,957 Mortgage servicing rights 11,602 — — 11,602
Qualitative Information About Unobservable Inputs Used in Recurring and Non-recurring Level 3 Fair Value Measurements, Other than Goodwill	The following table presents qualitative information about unobservable inputs used in recurring and non-recurring September 30, 2018 Fair Valuation Technique Unobservable Inputs Range Impaired loans $ 7,431 Collateral based measurement Discount to reflect current market conditions and ultimate collectability 0%-100% (11.1%) Mortgage servicing rights 12,044 Discounted cash flows Discount rate, Constant prepayment rate, Probability of default 10.3%-11.3% 9.3%-14.9% (9.5%), 0.1%-0.8% December 31, 2017 Fair Valuation Technique Unobservable Inputs Range (Weighted Average) Impaired loans $ 6,957 Collateral based measurement Discount to reflect current market conditions and ultimate collectability 0%-46.8% Mortgage servicing rights 11,602 Discounted cash flows Discount rate, Constant prepayment rate, Probability of default 9.6%-10.8% 9.2%-27.7% (10.5%), 0%-1.5%

Fair Value of Financial Instr_2

Fair Value of Financial Instruments (Tables)	9 Months Ended
	Sep. 30, 2018
Fair Value Disclosures [Abstract]
Summary of Estimated Fair Values of Financial Instruments	The following table presents estimated fair values of the Company’s financial instruments and the level within the fair value hierarchy in which the fair value measurements fall (unaudited). September 30, 2018 Carrying Amount Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Assets Cash and due from banks $ 69,697 $ 69,697 $ — $ — Investment securities, held to maturity 223,848 — 219,158 — Loans held for sale 1,980 — — 1,980 Loans (excluding loan level hedges), net 2,733,810 — — 2,610,426 Stock in FHLB 18,073 — 18,073 — Interest receivable 13,999 — 13,999 — Liabilities Non-interest $ 621,475 $ 621,475 $ — $ — Interest bearing deposits 2,507,079 — 2,373,715 — Borrowings 477,719 — 471,265 — Subordinated debentures 37,791 — 35,811 — Interest payable 1,688 — 1,688 — December 31, 2017 Carrying Amount Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Assets Cash and due from banks $ 76,441 $ 76,441 $ — $ — Investment securities, held to maturity 200,448 — 201,085 — Loans held for sale 3,094 — — 3,094 Loans (excluding loan level hedges), net 2,661,026 — — 2,585,879 Stock in FHLB 18,105 — 18,105 — Interest receivable 16,244 — 16,244 — Liabilities Non-interest $ 601,805 $ 601,805 $ — $ — Interest bearing deposits 2,279,198 — 2,156,487 — Borrowings 564,157 — 560,057 — Subordinated debentures 37,653 — 35,994 — Interest payable 886 — 886 —

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Income (Tables)	9 Months Ended
	Sep. 30, 2018
Equity [Abstract]
Components of Accumulated Other Comprehensive Income	September 30 December 31 Unrealized loss on securities available for sale $ (16,481 ) $ (3,937 ) Unamortized gain on securities held to maturity, previously transferred from AFS 47 200 Unrealized loss on derivative instruments 24 (1,728 ) Tax effect 3,447 1,914 Total accumulated other comprehensive loss $ (12,963 ) $ (3,551 )

Regulatory Capital (Tables)

Regulatory Capital (Tables)	9 Months Ended
	Sep. 30, 2018
Banking and Thrift [Abstract]
Summary of Regulatory Capital Requirement	Horizon and the Bank’s actual and required capital ratios as of September 30, 2018 and December 31, 2017 were as follows: Actual Required for Capital 1 Adequacy Purposes Required For Capital 1 Adequacy Purposes with Capital Buffer Well Capitalized Under 1 Corrective Action Amount Ratio Amount Ratio Amount Ratio Amount Ratio September 30, 2018 Total capital 1 Consolidated $ 417,728 13.31 % $ 251,097 8.00 % $ 290,331 9.25 % N/A N/A Bank 397,610 12.66 % 251,262 8.00 % 290,522 9.25 % $ 314,078 10.00 % Tier 1 capital 1 Consolidated 399,885 12.74 % 188,323 6.00 % 227,557 7.25 % N/A N/A Bank 379,767 12.09 % 188,447 6.00 % 227,706 7.25 % 251,262 8.00 % Common equity tier 1 capital 1 Consolidated 361,422 11.52 % 141,242 4.50 % 180,476 5.75 % N/A N/A Bank 379,767 12.09 % 141,335 4.50 % 180,595 5.75 % 204,150 6.50 % Tier 1 capital 1 Consolidated 399,885 10.05 % 159,098 4.00 % 159,098 4.00 % N/A N/A Bank 379,767 9.53 % 159,405 4.00 % 159,405 4.00 % 199,257 5.00 % December 31, 2017 Total capital 1 Consolidated $ 384,800 12.91 % $ 238,543 8.00 % $ 275,816 9.25 % N/A N/A Bank 382,788 12.85 % 238,386 8.00 % 275,634 9.25 % $ 297,982 10.00 % Tier 1 capital 1 Consolidated 368,355 12.35 % 178,907 6.00 % 216,180 7.25 % N/A N/A Bank 366,343 12.29 % 178,790 6.00 % 216,038 7.25 % 238,386 8.00 % Common equity tier 1 capital 1 Consolidated 329,892 11.06 % 134,181 4.50 % 171,454 5.75 % N/A N/A Bank 366,343 12.29 % 134,092 4.50 % 171,340 5.75 % 193,689 6.50 % Tier 1 capital 1 Consolidated 368,355 9.92 % 148,503 4.00 % 148,503 4.00 % N/A N/A Bank 366,343 9.89 % 148,116 4.00 % 148,116 4.00 % 185,145 5.00 %

Accounting Policies - Additiona

Accounting Policies - Additional Information (Detail)	Jun. 15, 2018	May 15, 2018$ / shares	Sep. 30, 2018$ / sharesshares	Sep. 30, 2017USD ($)	Sep. 30, 2018USD ($)$ / shares	Sep. 30, 2017USD ($)shares	Dec. 31, 2017$ / shares
Schedule Of Accounting Policies [Line Items]
Stock split ratio	0.015	0.015
Common stock, par value | $ / shares		$ 0
Shares, non-dilutive | shares			0			0
Reclassifications effect on net income				$ 0		$ 0
Accounting Standards Update 2018-02 [Member]
Schedule Of Accounting Policies [Line Items]
Cumulative-effect adjustment from AOCI to increase retained earnings					$ 766,000

Accounting Policies - Summary o

Accounting Policies - Summary of Computation of Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Basic earnings per share
Net income	$ 13,065	$ 8,171	$ 39,984	$ 25,467
Weighted average common shares outstanding	38,365,379	33,870,240	38,340,012	33,489,681
Basic Earnings Per Share	$ 0.34	$ 0.24	$ 1.04	$ 0.76
Diluted earnings per share
Net income available to common shareholders	$ 13,065	$ 8,171	$ 39,984	$ 25,467
Weighted average common shares outstanding	38,365,379	33,870,240	38,340,012	33,489,681
Effect of dilutive securities:
Weighted average common shares outstanding	38,534,970	34,072,909	38,503,403	33,683,696
Diluted Earnings Per Share	$ 0.34	$ 0.24	$ 1.04	$ 0.75
Restricted Stock [Member]
Effect of dilutive securities:
Effect of dilutive securities	47,603	55,123	43,926	50,686
Stock Options [Member]
Effect of dilutive securities:
Effect of dilutive securities	121,988	147,546	119,465	143,329

Accounting Policies - Summary_2

Accounting Policies - Summary of Computation of Basic and Diluted Earnings Per Share (Parenthetical) (Detail)	Jun. 15, 2018	May 15, 2018
Accounting Policies [Abstract]
Stock split ratio	0.015	0.015

Acquisitions - Additional Infor

Acquisitions - Additional Information (Detail) - USD ($)	Oct. 17, 2017	Sep. 01, 2017	Feb. 03, 2017	Dec. 31, 2017	Sep. 30, 2018	Sep. 30, 2017	Aug. 31, 2017
Business Acquisition [Line Items]
Common stock, shares outstanding				38,294,729	38,367,890
Acquisition of goodwill				$ 119,880,000	$ 119,880,000
Ownership interest percentage		5.00%
Wolverine Bancorp Inc [Member]
Business Acquisition [Line Items]
Exchange ratio per share	152.28%
Cash paid for each share	$ 14
Common stock, shares outstanding	2,129,331
Common stock issued	3,241,045
Market closing price per share	$ 19.37
Estimated transaction value	$ 93,800,000
Costs related to the acquisition	1,900,000
Total estimated purchase price	93,773,000
Net intangible assets acquired	2,024,000
Acquisition of goodwill	26,827,000
Purchase price of the business assets, portion deductible	$ 0
Core deposit intangible amortization period					10 years
Lafayette Community Bancorp [Member]
Business Acquisition [Line Items]
Exchange ratio per share		88.17%
Cash paid for each share		$ 1.73
Common stock, shares outstanding		1,856,679
Common stock issued		1,636,888
Market closing price per share							$ 17.45
Estimated transaction value							$ 34,500,000
Costs related to the acquisition		$ 1,700,000
Total estimated purchase price		34,465,000
Net intangible assets acquired		2,085,000
Acquisition of goodwill		15,408,000
Purchase price of the business assets, portion deductible		$ 0
Core deposit intangible amortization period					10 years
Gain on remeasurement of equity interest				$ 530,000
Payments received as cash consideration						$ (20,425,000)
Lafayette Community Bancorp [Member] | Maximum [Member]
Business Acquisition [Line Items]
Number of shares owned		100
Share of common stock outstanding per share		$ 17.25
First Farmers Bank & Trust Co [Member]
Business Acquisition [Line Items]
Net intangible assets acquired			$ 452,000,000
Acquisition of goodwill			$ 0
Core deposit intangible amortization period			10 years
Payments received as cash consideration			$ 11,000,000			$ (11,000,000)
Business acquisition, loans assumed			$ 3,400,000
Premium on deposits paid			3.00%
Business acquisition, customer deposit balances			$ 14,800,000

Acquisitions - Schedule of Fina

Acquisitions - Schedule of Final Purchase Price of Assets Acquired and Liabilities Assumed (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017	Oct. 17, 2017
Loans
Goodwill	$ 119,880	$ 119,880
Wolverine Bancorp Inc [Member]
Assets
Cash and due from banks			$ 44,450
Loans
Total loans			310,667
Premises and equipment, net			2,941
FRB and FHLB stock			2,700
Goodwill			26,827
Core deposit intangible			2,024
Interest receivable			584
Other assets			3,897
Total assets purchased			394,090
Common shares issued			62,111
Cash paid			31,662
Total estimated purchase price			93,773
Deposits
Non-interest bearing			25,221
NOW accounts			8,026
Savings and money market			129,044
Certificates of deposit			94,688
Total deposits			256,979
Borrowings			36,970
Interest payable			214
Other liabilities			6,154
Total liabilities assumed			300,317
Wolverine Bancorp Inc [Member] | Residential Mortgage [Member]
Loans
Total loans			30,603
Wolverine Bancorp Inc [Member] | Commercial [Member]
Loans
Total loans			276,167
Wolverine Bancorp Inc [Member] | Consumer [Member]
Loans
Total loans			$ 3,897

Acquisitions - Schedule of Acqu

Acquisitions - Schedule of Acquired Loans Accounted for in Accordance with ASC 310-30 (Detail) - USD ($) $ in Thousands	Oct. 17, 2017	Sep. 01, 2017
Wolverine Bancorp Inc [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Contractually required principal and interest at acquisition	$ 21,912
Contractual cash flows not expected to be collected (nonaccretable differences)	1,832
Expected cash flows at acquisition	20,080
Interest component of expected cash flows (accretable discount)	2,267
Fair value of acquired loans accounted for under ASC 310-30	$ 17,813
Lafayette Community Bancorp [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Contractually required principal and interest at acquisition		$ 6,128
Contractual cash flows not expected to be collected (nonaccretable differences)		1,326
Expected cash flows at acquisition		4,802
Interest component of expected cash flows (accretable discount)		933
Fair value of acquired loans accounted for under ASC 310-30		$ 3,869

Acquisitions - Schedule of Purc

Acquisitions - Schedule of Purchase Price of Assets Acquired and Liabilities Assumed (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017	Sep. 01, 2017
Loans
Goodwill	$ 119,880	$ 119,880
Lafayette Community Bancorp [Member]
Assets
Cash and due from banks			$ 24,846
Investment securities, available for sale			6
Loans
Total loans			134,299
Premises and equipment, net			7,818
FHLB stock			395
Goodwill			15,408
Core deposit intangible			2,085
Interest receivable			338
Other assets			1,649
Total assets purchased			186,844
Common shares issued			30,044
Cash paid			4,421
Total estimated purchase price			34,465
Deposits
Non-interest bearing			34,990
NOW accounts			30,174
Savings and money market			53,663
Certificates of deposit			32,520
Total deposits			151,347
Interest payable			42
Other liabilities			990
Total liabilities assumed			152,379
Lafayette Community Bancorp [Member] | Residential Mortgage [Member]
Loans
Total loans			12,761
Lafayette Community Bancorp [Member] | Commercial [Member]
Loans
Total loans			116,258
Lafayette Community Bancorp [Member] | Consumer [Member]
Loans
Total loans			$ 5,280

Acquisitions - Schedule of Pu_2

Acquisitions - Schedule of Purchase Price of Assets Acquired and Liabilities Assumed (Parenthetical) (Detail)	Jul. 18, 2016USD ($)
Lafayette Community Bancorp [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Common shares previously held	$ 955,000

Acquisitions - Pro Forma Result

Acquisitions - Pro Forma Result of Comparable Prior Reporting Period (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2017
Business Acquisition, Pro Forma Information [Abstract]
Net Interest Income	$ 32,038	$ 62,164
Provision for Loan Losses	(1,090)	(1,337)
Net Interest Income after Provision for Loan Losses	33,128	63,501
Non-interest Income	8,662	16,565
Non-interest Expense	26,714	51,398
Income before Income Taxes	15,076	28,668
Income Tax Expense	4,549	8,412
Net Income	10,527	20,256
Net Income Available to Common Shareholders	$ 10,527	$ 20,256
Basic Earnings per Share	$ 0.32	$ 0.61
Diluted Earnings per Share	$ 0.31	$ 0.60

Securities - Fair Value of Secu

Securities - Fair Value of Securities (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]
Total available for sale investment securities, Amortized Cost	$ 558,786	$ 513,602
Gross Unrealized Gains	176	2,502
Gross Unrealized Losses	(16,657)	(6,439)
Available-for-sale Securities, Fair Value	542,305	509,665
Held-to-maturity, Amortized Cost	223,848	200,448
Held-to-maturity, Gross Unrealized Gains	1,092	3,726
Held-to-maturity, Gross Unrealized Losses	(5,782)	(3,089)
Held-to-maturity, Fair Value	219,158	201,085
State and Municipal [Member]
Debt Securities, Available-for-sale [Line Items]
Total available for sale investment securities, Amortized Cost	159,812	148,045
Gross Unrealized Gains	57	2,189
Gross Unrealized Losses	(3,194)	(670)
Available-for-sale Securities, Fair Value	156,675	149,564
Held-to-maturity, Amortized Cost	204,619	179,836
Held-to-maturity, Gross Unrealized Gains	1,062	3,493
Held-to-maturity, Gross Unrealized Losses	(5,257)	(2,932)
Held-to-maturity, Fair Value	200,424	180,397
Federal Agency Collateralized Mortgage Obligations [Member]
Debt Securities, Available-for-sale [Line Items]
Total available for sale investment securities, Amortized Cost	178,069	132,871
Gross Unrealized Gains		45
Gross Unrealized Losses	(5,398)	(2,551)
Available-for-sale Securities, Fair Value	172,671	130,365
Held-to-maturity, Amortized Cost	5,262	5,734
Held-to-maturity, Gross Unrealized Gains	3	17
Held-to-maturity, Gross Unrealized Losses	(182)	(69)
Held-to-maturity, Fair Value	5,083	5,682
Federal Agency Mortgage-backed Pools [Member]
Debt Securities, Available-for-sale [Line Items]
Total available for sale investment securities, Amortized Cost	193,461	211,487
Gross Unrealized Gains	16	155
Gross Unrealized Losses	(7,502)	(2,985)
Available-for-sale Securities, Fair Value	185,975	208,657
Held-to-maturity, Amortized Cost	13,967	14,878
Held-to-maturity, Gross Unrealized Gains	27	216
Held-to-maturity, Gross Unrealized Losses	(343)	(88)
Held-to-maturity, Fair Value	13,651	15,006
U.S. Treasury and Federal Agencies [Member]
Debt Securities, Available-for-sale [Line Items]
Total available for sale investment securities, Amortized Cost	17,036	19,277
Gross Unrealized Losses	(464)	(225)
Available-for-sale Securities, Fair Value	16,572	19,052
Private Labeled Mortgage-backed Pools [Member]
Debt Securities, Available-for-sale [Line Items]
Total available for sale investment securities, Amortized Cost		1,650
Gross Unrealized Losses		(8)
Available-for-sale Securities, Fair Value		1,642
Corporate Notes [Member]
Debt Securities, Available-for-sale [Line Items]
Total available for sale investment securities, Amortized Cost	10,408	272
Gross Unrealized Gains	103	113
Gross Unrealized Losses	(99)
Available-for-sale Securities, Fair Value	$ 10,412	$ 385

Securities - Additional Informa

Securities - Additional Information (Detail)	Sep. 30, 2018USD ($)
Investments, Debt and Equity Securities [Abstract]
Unrealized loss, other than temporary securities	$ 0

Securities - Amortized Cost and

Securities - Amortized Cost and Fair Value of Securities Available for Sale and Held to Maturity (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]
Amortized cost within one year	$ 19,958	$ 13,347
Amortized cost one to five years	34,822	40,468
Amortized cost for five to ten years	96,035	50,473
Amortized cost for after ten years	36,441	63,306
Total amortized cost	187,256	167,594
Total available for sale investment securities, Amortized Cost	558,786	513,602
Within one year, amortized cost	5,646	1,948
One to five years, amortized cost	48,383	40,603
Five to ten years, amortized cost	102,816	89,801
After ten years, amortized cost	47,774	47,484
Total amortized cost	204,619	179,836
Total held to maturity investment securities, amortized cost	223,848	200,448
Fair value within one year	19,861	13,326
Fair value for one to five years	34,019	40,193
Fair value for five to ten years	94,103	51,156
Fair value for after ten years	35,676	64,326
Total fair value	183,659	169,001
Investment securities, available for sale	542,305	509,665
Within one year, fair value	5,628	1,934
One to five years, fair value	48,788	41,531
five to ten years, fair value	101,199	91,249
After ten years, fair value	44,809	45,683
Total fair value	200,424	180,397
Held-to-maturity, Fair Value	219,158	201,085
Federal Agency Collateralized Mortgage Obligations [Member]
Debt Securities, Available-for-sale [Line Items]
Total available for sale investment securities, Amortized Cost	178,069	132,871
Total held to maturity investment securities, amortized cost	5,262	5,734
Investment securities, available for sale	172,671	130,365
Held-to-maturity, Fair Value	5,083	5,682
Federal Agency Mortgage-backed Pools [Member]
Debt Securities, Available-for-sale [Line Items]
Total available for sale investment securities, Amortized Cost	193,461	211,487
Total held to maturity investment securities, amortized cost	13,967	14,878
Investment securities, available for sale	185,975	208,657
Held-to-maturity, Fair Value	$ 13,651	15,006
Private Labeled Mortgage-backed Pools [Member]
Debt Securities, Available-for-sale [Line Items]
Total available for sale investment securities, Amortized Cost		1,650
Investment securities, available for sale		$ 1,642

Securities - Gross Unrealized L

Securities - Gross Unrealized Losses and Fair Value of Company's Investments (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]
Fair Value less than 12 months	$ 352,517	$ 229,768
Fair value more than 12 months	313,819	193,869
Total fair value	666,336	423,637
Unrealized losses less than 12 months	(6,027)	(4,554)
Unrealized losses more than 12 months	(16,412)	(4,974)
Total unrealized losses	(22,439)	(9,528)
U.S. Treasury and Federal Agencies [Member]
Debt Securities, Available-for-sale [Line Items]
Fair Value less than 12 months	7,763	15,882
Fair value more than 12 months	8,809	2,870
Total fair value	16,572	18,752
Unrealized losses less than 12 months	(137)	(180)
Unrealized losses more than 12 months	(327)	(45)
Total unrealized losses	(464)	(225)
State and Municipal [Member]
Debt Securities, Available-for-sale [Line Items]
Fair Value less than 12 months	215,439	54,312
Fair value more than 12 months	56,725	30,691
Total fair value	272,164	85,003
Unrealized losses less than 12 months	(3,691)	(2,758)
Unrealized losses more than 12 months	(4,760)	(844)
Total unrealized losses	(8,451)	(3,602)
Federal Agency Collateralized Mortgage Obligations [Member]
Debt Securities, Available-for-sale [Line Items]
Fair Value less than 12 months	72,495	54,006
Fair value more than 12 months	102,498	73,462
Total fair value	174,993	127,468
Unrealized losses less than 12 months	(830)	(589)
Unrealized losses more than 12 months	(4,750)	(2,031)
Total unrealized losses	(5,580)	(2,620)
Federal Agency Mortgage-backed Pools [Member]
Debt Securities, Available-for-sale [Line Items]
Fair Value less than 12 months	48,696	103,926
Fair value more than 12 months	145,787	86,846
Total fair value	194,483	190,772
Unrealized losses less than 12 months	(1,270)	(1,019)
Unrealized losses more than 12 months	(6,575)	(2,054)
Total unrealized losses	(7,845)	(3,073)
Private Labeled Mortgage-backed Pools [Member]
Debt Securities, Available-for-sale [Line Items]
Fair Value less than 12 months		1,642
Total fair value		1,642
Unrealized losses less than 12 months		(8)
Total unrealized losses		$ (8)
Corporate Notes [Member]
Debt Securities, Available-for-sale [Line Items]
Fair Value less than 12 months	8,124
Total fair value	8,124
Unrealized losses less than 12 months	(99)
Total unrealized losses	$ (99)

Securities - Sales of Securitie

Securities - Sales of Securities Available for Sale (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Investments, Debt and Equity Securities [Abstract]
Proceeds	$ 7,485	$ 387	$ 17,321	$ 5,490
Gross gains		$ 6	37	151
Gross losses	$ (122)		$ (148)	$ (113)

Loans - Amounts of Loans (Detai

Loans - Amounts of Loans (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Jun. 30, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage warehouse	$ 71,422		$ 94,508
Total loans	2,957,386		2,831,995
Allowance for loan losses	(17,798)	$ (17,071)	(16,394)	$ (15,586)	$ (15,027)	$ (14,837)
Loans, net	2,939,588		2,815,601
Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial/Consumer, Total	1,698,582		1,669,728
Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Real Estate, Total	651,250		606,760
Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial/Consumer, Total	536,132		460,999
Working Capital and Equipment [Member] | Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial/Consumer, Total	764,422		720,477
Real Estate Including Agriculture [Member] | Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial/Consumer, Total	850,364		880,861
Tax Exempt Loans Receivable [Member] | Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial/Consumer, Total	46,171		36,324
Other Commercial Loans [Member] | Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial/Consumer, Total	37,625		32,066
1-4 Family [Member] | Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Real Estate, Total	643,396		599,217
Other Real Estate Loans [Member] | Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Real Estate, Total	7,854		7,543
Auto [Member] | Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial/Consumer, Total	316,925		244,003
Recreation Consumer Loans Receivable [Member] | Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial/Consumer, Total	13,339		8,728
Real Estate Home Improvement Loans Receivable [Member] | Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial/Consumer, Total	39,104		37,052
Home Equity Loan [Member] | Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial/Consumer, Total	161,398		165,240
Unsecured Debt [Member] | Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial/Consumer, Total	4,017		3,479
Other Consumer Loans [Member] | Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial/Consumer, Total	$ 1,349		$ 2,497

Loans - Additional Information

Loans - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2018
Receivables [Abstract]
Period of loan sold	30 days
Minimum period seldom held	90 days
Mortgage warehousing maximum pay off period	30 days

Loans - Recorded Investment of

Loans - Recorded Investment of Individual Loan Categories (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Jun. 30, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	$ 2,961,481		$ 2,838,288
Net loans	2,943,683		2,821,894
Interest Due	10,093		9,226
Deferred Fees / (Costs)	(4,095)		(6,293)
Recorded Investment	2,967,479		2,841,221
Recorded Investment	2,949,681		2,824,827
Allowance for loan losses	(17,798)	$ (17,071)	(16,394)	$ (15,586)	$ (15,027)	$ (14,837)
Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	1,702,839		1,675,389
Interest Due	5,843		5,401
Deferred Fees / (Costs)	(4,257)		(5,661)
Recorded Investment	1,704,425		1,675,129
Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	724,771		703,643
Interest Due	2,516		2,295
Deferred Fees / (Costs)	(2,099)		(2,375)
Recorded Investment	725,188		703,563
Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	533,871		459,256
Interest Due	1,734		1,530
Deferred Fees / (Costs)	2,261		1,743
Recorded Investment	537,866		462,529
Owner Occupied Real Estate [Member] | Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	583,261		575,816
Interest Due	1,690		1,511
Deferred Fees / (Costs)	(1,693)		(1,917)
Recorded Investment	583,258		575,410
Non Owner Occupied Real Estate [Member] | Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	704,284		683,901
Interest Due	1,091		1,138
Deferred Fees / (Costs)	(2,128)		(2,478)
Recorded Investment	703,247		682,561
Residential Spec Homes [Member] | Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	7,254		16,591
Interest Due	16		63
Deferred Fees / (Costs)	(2)		(80)
Recorded Investment	7,268		16,574
Development & Spec Land [Member] | Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	43,889		49,996
Interest Due	127		117
Deferred Fees / (Costs)	(27)		(579)
Recorded Investment	43,989		49,534
Commercial and Industrial [Member] | Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	364,151		349,085
Interest Due	2,919		2,572
Deferred Fees / (Costs)	(407)		(607)
Recorded Investment	366,663		351,050
Residential Mortgage [Member] | Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	630,955		593,108
Interest Due	1,995		1,776
Deferred Fees / (Costs)	(2,099)		(2,375)
Recorded Investment	630,851		592,509
Residential Construction [Member] | Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	22,394		16,027
Interest Due	41		39
Recorded Investment	22,435		16,066
Mortgage Warehousing [Member] | Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	71,422		94,508
Interest Due	480		480
Recorded Investment	71,902		94,988
Direct Installment [Member] | Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	37,895		36,737
Interest Due	107		113
Deferred Fees / (Costs)	586		552
Recorded Investment	38,588		37,402
Indirect Installment [Member] | Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	303,579		227,659
Interest Due	696		528
Deferred Fees / (Costs)			(168)
Recorded Investment	304,275		228,019
Home Equity Loan [Member] | Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	192,397		194,860
Interest Due	931		889
Deferred Fees / (Costs)	1,675		1,359
Recorded Investment	$ 195,003		$ 197,108

Accounting for Certain Loans _3

Accounting for Certain Loans Acquired in a Transfer - Amounts of Loans (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Jun. 30, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	$ 2,957,386		$ 2,831,995
Allowance for loan losses	17,798	$ 17,071	16,394	$ 15,586	$ 15,027	$ 14,837
Carrying Amount	2,943,683		2,821,894
Loans Purchased With Evidence of Credit Deterioration [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	18,351		29,863
Allowance for loan losses	121
Carrying Amount	18,230		29,863
Loans Purchased With Evidence of Credit Deterioration [Member] | Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	16,298		27,198
Loans Purchased With Evidence of Credit Deterioration [Member] | Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	2,024		2,632
Loans Purchased With Evidence of Credit Deterioration [Member] | Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	29		33
Loans Purchased With Evidence of Credit Deterioration [Member] | Heartland [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	427		619
Carrying Amount	427		619
Loans Purchased With Evidence of Credit Deterioration [Member] | Heartland [Member] | Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	242		390
Loans Purchased With Evidence of Credit Deterioration [Member] | Heartland [Member] | Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	185		229
Loans Purchased With Evidence of Credit Deterioration [Member] | Summit [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	2,038		4,523
Carrying Amount	2,038		4,523
Loans Purchased With Evidence of Credit Deterioration [Member] | Summit [Member] | Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	1,463		3,653
Loans Purchased With Evidence of Credit Deterioration [Member] | Summit [Member] | Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	575		870
Loans Purchased With Evidence of Credit Deterioration [Member] | Peoples Bancorp Inc [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	383		441
Carrying Amount	383		441
Loans Purchased With Evidence of Credit Deterioration [Member] | Peoples Bancorp Inc [Member] | Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	280		315
Loans Purchased With Evidence of Credit Deterioration [Member] | Peoples Bancorp Inc [Member] | Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	103		126
Loans Purchased With Evidence of Credit Deterioration [Member] | Kosciusko Financial Inc [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	968		1,241
Carrying Amount	968		1,241
Loans Purchased With Evidence of Credit Deterioration [Member] | Kosciusko Financial Inc [Member] | Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	769		838
Loans Purchased With Evidence of Credit Deterioration [Member] | Kosciusko Financial Inc [Member] | Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	199		403
Loans Purchased With Evidence of Credit Deterioration [Member] | LaPorte Bancorp Inc [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	1,802		2,071
Allowance for loan losses	106
Carrying Amount	1,696		2,071
Loans Purchased With Evidence of Credit Deterioration [Member] | LaPorte Bancorp Inc [Member] | Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	811		1,034
Loans Purchased With Evidence of Credit Deterioration [Member] | LaPorte Bancorp Inc [Member] | Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	962		1,004
Loans Purchased With Evidence of Credit Deterioration [Member] | LaPorte Bancorp Inc [Member] | Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	29		33
Loans Purchased With Evidence of Credit Deterioration [Member] | Lafayette Community Bancorp [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	3,245		4,271
Allowance for loan losses	15
Carrying Amount	3,230		4,271
Loans Purchased With Evidence of Credit Deterioration [Member] | Lafayette Community Bancorp [Member] | Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	3,245		4,271
Loans Purchased With Evidence of Credit Deterioration [Member] | Wolverine Bancorp Inc [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	9,488		16,697
Carrying Amount	9,488		16,697
Loans Purchased With Evidence of Credit Deterioration [Member] | Wolverine Bancorp Inc [Member] | Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	$ 9,488		$ 16,697

Accounting for Certain Loans _4

Accounting for Certain Loans Acquired in a Transfer - Accretable Yield or Income Expected to be Collected (Detail) - Loans Purchased With Evidence of Credit Deterioration [Member] - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	$ 5,165	$ 3,457
Additions	0	0
Accretion	(1,210)	(1,029)
Reclassification from nonaccretable difference	0	0
Disposals	(906)	(315)
Ending balance	3,049	2,113
Heartland [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	452	557
Additions	0	0
Accretion	(77)	(99)
Reclassification from nonaccretable difference	0	0
Disposals	(193)	(6)
Ending balance	182	452
Summit [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	147	502
Additions	0	0
Accretion	(48)	(268)
Reclassification from nonaccretable difference	0	0
Disposals	(9)	(2)
Ending balance	90	232
Peoples Bancorp Inc [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance		389
Additions		0
Accretion		(388)
Reclassification from nonaccretable difference		0
Disposals		(1)
Kosciusko Financial Inc [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	386	530
Additions	0	0
Accretion	(60)	(80)
Reclassification from nonaccretable difference	0	0
Disposals		(42)
Ending balance	326	408
LaPorte Bancorp Inc [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	980	1,479
Additions	0	0
Accretion	(110)	(194)
Reclassification from nonaccretable difference	0	0
Disposals	(7)	(264)
Ending balance	863	$ 1,021
Lafayette Community Bancorp [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	933
Additions	0
Accretion	(229)
Reclassification from nonaccretable difference	0
Disposals	(16)
Ending balance	688
Wolverine Bancorp Inc [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	2,267
Additions	0
Accretion	(686)
Reclassification from nonaccretable difference	0
Disposals	(681)
Ending balance	$ 900

Accounting for Certain Loans _5

Accounting for Certain Loans Acquired in a Transfer - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Business Acquisition [Line Items]
Total provision charged to operating expense	$ 1,176,000	$ 710,000	$ 2,378,000	$ 1,370,000
Loans Purchased With Evidence of Credit Deterioration [Member]
Business Acquisition [Line Items]
Total provision charged to operating expense			$ 121,000	$ 71,000

Allowance for Loan Losses - Add

Allowance for Loan Losses - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2018
Minimum [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Actual loss history experienced by the Company	1 year
Maximum [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Actual loss history experienced by the Company	5 years
Allowance for loan losses charge down family first and junior lien mortgages past due period	180 days
Allowance for loan losses charge down unsecured open end loans past due period	90 days
Allowance for loan losses charge down other secured loans past due period	90 days

Allowance for Loan Losses - All

Allowance for Loan Losses - Allowance for Loan Losses (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of the period	$ 17,071	$ 15,027	$ 16,394	$ 14,837
Total loans charged-off	671	663	1,804	1,683
Total loan recoveries	222	512	830	1,062
Net loans charged-off	449	151	974	621
Total provision charged to operating expense	1,176	710	2,378	1,370
Balance at the end of the period	17,798	15,586	17,798	15,586
Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans charged-off	206	264	219	524
Total loan recoveries	27	106	118	277
Total provision charged to operating expense	1,895	429	1,589	1,357
Commercial [Member] | Owner Occupied Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans charged-off	97	12	110	12
Total loan recoveries	7	7	19	8
Commercial [Member] | Non Owner Occupied Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans charged-off		20		20
Total loan recoveries	5	4	22	29
Commercial [Member] | Residential Spec Homes [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loan recoveries	2	2	6	6
Commercial [Member] | Development & Spec Land [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans charged-off				1
Commercial [Member] | Commercial and Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans charged-off	109	232	109	491
Total loan recoveries	13	93	71	234
Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans charged-off	2	37	17	89
Total loan recoveries	4	13	15	35
Total provision charged to operating expense	(243)	361	(612)	(113)
Real Estate [Member] | Residential Mortgage [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans charged-off	2	37	17	89
Total loan recoveries	4	13	15	35
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans charged-off	463	362	1,568	1,070
Total loan recoveries	191	393	697	750
Total provision charged to operating expense	(476)	(80)	1,401	126
Consumer [Member] | Direct Installment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans charged-off	20	84	124	113
Total loan recoveries	10	249	42	281
Consumer [Member] | Indirect Installment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans charged-off	432	254	1,302	862
Total loan recoveries	107	119	378	384
Consumer [Member] | Home Equity Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans charged-off	11	24	142	95
Total loan recoveries	$ 74	$ 25	$ 277	$ 85

Allowance for Loan Losses - A_2

Allowance for Loan Losses - Allowance for Loan Losses and Recorded Investment in Loans by Portfolio Segment (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Jun. 30, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Dec. 31, 2016
Financing Receivable, Allowance for Credit Losses [Line Items]
Total ending allowance balance	$ 17,798	$ 17,071	$ 16,394	$ 15,586	$ 15,027	$ 14,837
Total ending loans balance	8,358			$ 3,451
Loans Purchased With Evidence of Credit Deterioration [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total ending allowance balance	121
Allowance for Loan Losses [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance For Loan Losses, Individually evaluated for impairment	924		184
Allowance For Loan Losses, Collectively evaluated for impairment	16,874		16,210
Total ending allowance balance	17,798		16,394
Allowance for Loan Losses [Member] | Loans Purchased With Evidence of Credit Deterioration [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance For Loan Losses, Loans acquired with deteriorated credit quality	0		0
Commercial [Member] | Allowance for Loan Losses [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance For Loan Losses, Individually evaluated for impairment	924		184
Allowance For Loan Losses, Collectively evaluated for impairment	9,657		8,909
Total ending allowance balance	10,581		9,093
Commercial [Member] | Allowance for Loan Losses [Member] | Loans Purchased With Evidence of Credit Deterioration [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance For Loan Losses, Loans acquired with deteriorated credit quality	0		0
Real Estate [Member] | Allowance for Loan Losses [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance For Loan Losses, Collectively evaluated for impairment	1,574		2,188
Total ending allowance balance	1,574		2,188
Real Estate [Member] | Allowance for Loan Losses [Member] | Loans Purchased With Evidence of Credit Deterioration [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance For Loan Losses, Loans acquired with deteriorated credit quality	0		0
Consumer [Member] | Allowance for Loan Losses [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance For Loan Losses, Collectively evaluated for impairment	4,613		4,083
Total ending allowance balance	4,613		4,083
Consumer [Member] | Allowance for Loan Losses [Member] | Loans Purchased With Evidence of Credit Deterioration [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance For Loan Losses, Loans acquired with deteriorated credit quality	0		0
Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans: Individually evaluated for impairment	8,358		7,187
Loans: Collectively evaluated for impairment	2,959,121		2,834,034
Total ending loans balance	2,967,479		2,841,221
Loans [Member] | Loans Purchased With Evidence of Credit Deterioration [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans acquired with deteriorated credit quality	0		0
Loans [Member] | Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans: Individually evaluated for impairment	8,358		7,187
Loans: Collectively evaluated for impairment	1,696,067		1,667,942
Total ending loans balance	1,704,425		1,675,129
Loans [Member] | Commercial [Member] | Loans Purchased With Evidence of Credit Deterioration [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans acquired with deteriorated credit quality	0		0
Loans [Member] | Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans: Collectively evaluated for impairment	653,286		608,575
Total ending loans balance	653,286		608,575
Loans [Member] | Real Estate [Member] | Loans Purchased With Evidence of Credit Deterioration [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans acquired with deteriorated credit quality	0		0
Loans [Member] | Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans: Collectively evaluated for impairment	537,866		462,529
Total ending loans balance	537,866		462,529
Loans [Member] | Consumer [Member] | Loans Purchased With Evidence of Credit Deterioration [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans acquired with deteriorated credit quality	0		0
Mortgage Warehousing [Member] | Allowance for Loan Losses [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance For Loan Losses, Collectively evaluated for impairment	1,030		1,030
Total ending allowance balance	1,030		1,030
Mortgage Warehousing [Member] | Allowance for Loan Losses [Member] | Loans Purchased With Evidence of Credit Deterioration [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance For Loan Losses, Loans acquired with deteriorated credit quality	0		0
Mortgage Warehousing [Member] | Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans: Collectively evaluated for impairment	71,902		94,988
Total ending loans balance	71,902		94,988
Mortgage Warehousing [Member] | Loans [Member] | Loans Purchased With Evidence of Credit Deterioration [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans acquired with deteriorated credit quality	$ 0		$ 0

Non-performing Loans and Impa_3

Non-performing Loans and Impaired Loans - Non-accrual, Loans Past Due Over 90 Days Still on Accrual, and Troubled Debt Restructured ("TDRs") by Class of Loans (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	$ 11,417	$ 13,276
Loans Past Due Over 90 Days Still Accruing	202	167
Non-Performing TDRs	1,077	1,013
Performing TDRs	1,830	1,958
Total Non-Performing Loans	14,526	16,414
Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	7,854	6,902
Non-Performing TDRs	501	451
Performing TDRs		1
Total Non-Performing Loans	8,355	7,354
Commercial [Member] | Owner Occupied Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	5,341	4,877
Non-Performing TDRs		11
Performing TDRs		1
Total Non-Performing Loans	5,341	4,889
Commercial [Member] | Non Owner Occupied Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	527	115
Non-Performing TDRs	501	440
Total Non-Performing Loans	1,028	555
Commercial [Member] | Development & Spec Land [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	71	176
Total Non-Performing Loans	71	176
Commercial [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	1,915	1,734
Total Non-Performing Loans	1,915	1,734
Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	1,702	3,693
Loans Past Due Over 90 Days Still Accruing	142
Non-Performing TDRs	429	351
Performing TDRs	1,481	1,672
Total Non-Performing Loans	3,754	5,716
Real Estate [Member] | Residential Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	1,702	3,693
Loans Past Due Over 90 Days Still Accruing	142
Non-Performing TDRs	429	351
Performing TDRs	1,481	1,450
Total Non-Performing Loans	3,754	5,494
Real Estate [Member] | Residential Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Performing TDRs		222
Total Non-Performing Loans		222
Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	1,861	2,681
Loans Past Due Over 90 Days Still Accruing	60	167
Non-Performing TDRs	147	211
Performing TDRs	349	285
Total Non-Performing Loans	2,417	3,344
Consumer [Member] | Direct Installment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	62	160
Total Non-Performing Loans	62	160
Consumer [Member] | Indirect Installment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	608	1,041
Loans Past Due Over 90 Days Still Accruing	60	167
Total Non-Performing Loans	668	1,208
Consumer [Member] | Home Equity Loan [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	1,191	1,480
Non-Performing TDRs	147	211
Performing TDRs	349	285
Total Non-Performing Loans	$ 1,687	$ 1,976

Non-performing Loans and Impa_4

Non-performing Loans and Impaired Loans - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2018USD ($)ConsecutivePaymentContract	Dec. 31, 2017USD ($)
Financing Receivable, Modifications [Line Items]
Non-accrual loans	$ 11,417,000	$ 13,276,000
Non-performing TDRs	$ 1,100,000
Loan delinquency period	90 days
Minimum period required for satisfactory performance to return loan from non-accrual to accrual status	6 months
Restructured loan reported in TDRs	$ 2,900,000
Restructured loan returned to accruing status number of Consecutive Payments of loan | ConsecutivePayment	6
Specific reserves allocated to troubled debt restructuring	$ 70,000
Number TDRs returned to accrual status | Contract	32,000
Performing Financing Receivable [Member]
Financing Receivable, Modifications [Line Items]
Restructured loan reported in TDRs	$ 1,800,000
Principal Forgiveness [Member]
Financing Receivable, Modifications [Line Items]
Restructured loan reported in TDRs	0
Loans Purchased With Evidence of Credit Deterioration [Member]
Financing Receivable, Modifications [Line Items]
Non-accrual loans	2,200,000
Non-performing TDRs	$ 0
Minimum [Member]
Financing Receivable, Modifications [Line Items]
Loan delinquency period	90 days
Delay or shortfall in payments of loan	30 days
Loans with an aggregate credit exposure	$ 1,000,000
Loans classified as TDR after a period	90 days
Minimum [Member] | Good Pass [Member]
Financing Receivable, Modifications [Line Items]
Number of consecutive years of profit Unaudited Financial Information for Good Pass Rating	5 years
Number of years of Satisfactory Relationship with bank for Good Pass Rating	5 years
Number of consecutive years of profit for Good Pass Rating	3 years
Minimum [Member] | Satisfactory Pass [Member]
Financing Receivable, Modifications [Line Items]
Minimum number of years of Satisfactory Repayment required for Satisfactory Pass Rating	2 years
Maximum [Member]
Financing Receivable, Modifications [Line Items]
Loans with an aggregate credit exposure	$ 3,500,000
Loans classified as TDR after a period	120 days

Non-performing Loans and Impa_5

Non-performing Loans and Impaired Loans - Commercial Loans Individually Evaluated for Impairment by Class of Loan (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance total	$ 8,355	$ 3,433	$ 8,355	$ 3,433
Total ending loans balance	8,358	3,451	8,358	3,451
Allowance For Loan Loss Allocated	924		924
Average Balance in Impaired Loans total	9,228	3,923	9,311	2,642
Cash/Accrual Interest Income Recognized, Total	(17)	7	96	25
Commercial [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance With no recorded allowance	6,573	3,433	6,573	3,433
Recorded Investment With no recorded allowance	6,576	3,451	6,576	3,451
Allowance For Loan Loss Allocated With no recorded allowance	0	0	0	0
Average Balance in Impaired Loans With no recorded allowance	7,437	3,923	7,509	2,642
Cash/Accrual Interest Income Recognized, With no recorded allowance	(25)	7	88	25
Unpaid Principal Balance With an allowance recorded	1,782		1,782
Recorded Investment With an allowance recorded	1,782		1,782
Allowance For Loan Loss Allocated	924		924
Average Balance in Impaired Loans With an allowance recorded	1,791		1,802
Cash/Accrual Interest Income Recognized, With an allowance recorded	8		8
Commercial [Member] | Owner Occupied Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance With no recorded allowance	4,496	923	4,496	923
Recorded Investment With no recorded allowance	4,490	934	4,490	934
Allowance For Loan Loss Allocated With no recorded allowance	0	0	0	0
Average Balance in Impaired Loans With no recorded allowance	5,014	1,167	5,077	1,033
Cash/Accrual Interest Income Recognized, With no recorded allowance	(25)	4	71	4
Unpaid Principal Balance With an allowance recorded	845		845
Recorded Investment With an allowance recorded	845		845
Allowance For Loan Loss Allocated	145		145
Average Balance in Impaired Loans With an allowance recorded	852		874
Commercial [Member] | Non Owner Occupied Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance With no recorded allowance	841	701	841	701
Recorded Investment With no recorded allowance	857	701	857	701
Allowance For Loan Loss Allocated With no recorded allowance	0	0	0	0
Average Balance in Impaired Loans With no recorded allowance	936	468	1,119	308
Cash/Accrual Interest Income Recognized, With no recorded allowance	(5)		5	2
Unpaid Principal Balance With an allowance recorded	187		187
Recorded Investment With an allowance recorded	187		187
Allowance For Loan Loss Allocated	30		30
Average Balance in Impaired Loans With an allowance recorded	189		178
Cash/Accrual Interest Income Recognized, With an allowance recorded	4		4
Commercial [Member] | Residential Spec Homes [Member]
Financing Receivable, Impaired [Line Items]
Allowance For Loan Loss Allocated With no recorded allowance	0	0	0	0
Commercial [Member] | Development & Spec Land [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance With no recorded allowance	71	102	71	102
Recorded Investment With no recorded allowance	69	102	69	102
Allowance For Loan Loss Allocated With no recorded allowance	0	0	0	0
Average Balance in Impaired Loans With no recorded allowance	69	222	72	230
Commercial [Member] | Commercial and Industrial [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance With no recorded allowance	1,165	1,707	1,165	1,707
Recorded Investment With no recorded allowance	1,160	1,714	1,160	1,714
Allowance For Loan Loss Allocated With no recorded allowance	0	0	0	0
Average Balance in Impaired Loans With no recorded allowance	1,418	2,066	1,241	1,071
Cash/Accrual Interest Income Recognized, With no recorded allowance	5	$ 3	12	$ 19
Unpaid Principal Balance With an allowance recorded	750		750
Recorded Investment With an allowance recorded	750		750
Allowance For Loan Loss Allocated	749		749
Average Balance in Impaired Loans With an allowance recorded	750		750
Cash/Accrual Interest Income Recognized, With an allowance recorded	$ 4		$ 4

Non-performing Loans and Impa_6

Non-performing Loans and Impaired Loans - Payment Status by Class of Loan (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	$ 8,116	$ 9,496
Loans Not Past Due	2,953,365	2,828,792
Total	$ 2,961,481	$ 2,838,288
Total Past Due, Percentage of Total Loans	0.27%	0.33%
Loans Not Past Due, Percentage of Total Loans	99.73%	99.67%
Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	$ 2,641	$ 4,749
Loans Not Past Due	1,700,198	1,670,640
Total	1,702,839	1,675,389
Commercial [Member] | Owner Occupied Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	506	3,563
Loans Not Past Due	582,755	572,253
Total	583,261	575,816
Commercial [Member] | Non Owner Occupied Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	404	634
Loans Not Past Due	703,880	683,267
Total	704,284	683,901
Commercial [Member] | Residential Spec Homes [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans Not Past Due	7,254	16,591
Total	7,254	16,591
Commercial [Member] | Development & Spec Land [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		31
Loans Not Past Due	43,889	49,965
Total	43,889	49,996
Commercial [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,731	521
Loans Not Past Due	362,420	348,564
Total	364,151	349,085
Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	3,063	1,360
Loans Not Past Due	721,708	702,283
Total	724,771	703,643
Real Estate [Member] | Residential Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2,940	1,297
Loans Not Past Due	628,015	591,811
Total	630,955	593,108
Real Estate [Member] | Residential Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	123	63
Loans Not Past Due	22,271	15,964
Total	22,394	16,027
Real Estate [Member] | Mortgage Warehousing [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans Not Past Due	71,422	94,508
Total	71,422	94,508
Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2,412	3,387
Loans Not Past Due	531,459	455,869
Total	533,871	459,256
Consumer [Member] | Direct Installment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	87	88
Loans Not Past Due	37,808	36,649
Total	37,895	36,737
Consumer [Member] | Indirect Installment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,398	2,270
Loans Not Past Due	302,181	225,389
Total	303,579	227,659
Consumer [Member] | Home Equity Loan [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	927	1,029
Loans Not Past Due	191,470	193,831
Total	192,397	194,860
30 - 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	$ 6,878	$ 6,426
Total Past Due, Percentage of Total Loans	0.23%	0.23%
30 - 59 Days Past Due [Member] | Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	$ 2,206	$ 2,676
30 - 59 Days Past Due [Member] | Commercial [Member] | Owner Occupied Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	448	1,613
30 - 59 Days Past Due [Member] | Commercial [Member] | Non Owner Occupied Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	370	512
30 - 59 Days Past Due [Member] | Commercial [Member] | Development & Spec Land [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		31
30 - 59 Days Past Due [Member] | Commercial [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,388	520
30 - 59 Days Past Due [Member] | Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2,765	1,311
30 - 59 Days Past Due [Member] | Real Estate [Member] | Residential Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2,642	1,248
30 - 59 Days Past Due [Member] | Real Estate [Member] | Residential Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	123	63
30 - 59 Days Past Due [Member] | Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,907	2,439
30 - 59 Days Past Due [Member] | Consumer [Member] | Direct Installment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	67	78
30 - 59 Days Past Due [Member] | Consumer [Member] | Indirect Installment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,025	1,859
30 - 59 Days Past Due [Member] | Consumer [Member] | Home Equity Loan [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	815	502
60 - 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	$ 1,036	$ 2,903
Total Past Due, Percentage of Total Loans	0.03%	0.10%
60 - 89 Days Past Due [Member] | Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	$ 435	$ 2,073
60 - 89 Days Past Due [Member] | Commercial [Member] | Owner Occupied Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	58	1,950
60 - 89 Days Past Due [Member] | Commercial [Member] | Non Owner Occupied Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	34	122
60 - 89 Days Past Due [Member] | Commercial [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	343	1
60 - 89 Days Past Due [Member] | Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	156	49
60 - 89 Days Past Due [Member] | Real Estate [Member] | Residential Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	156	49
60 - 89 Days Past Due [Member] | Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	445	781
60 - 89 Days Past Due [Member] | Consumer [Member] | Direct Installment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	20	10
60 - 89 Days Past Due [Member] | Consumer [Member] | Indirect Installment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	313	244
60 - 89 Days Past Due [Member] | Consumer [Member] | Home Equity Loan [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	112	527
Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	$ 202	$ 167
Total Past Due, Percentage of Total Loans	0.01%	0.01%
Greater than 90 Days Past Due [Member] | Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	$ 142
Greater than 90 Days Past Due [Member] | Real Estate [Member] | Residential Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	142
Greater than 90 Days Past Due [Member] | Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	60	$ 167
Greater than 90 Days Past Due [Member] | Consumer [Member] | Indirect Installment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	$ 60	$ 167

Non-performing Loans and Impa_7

Non-performing Loans and Impaired Loans - Loans by Credit Grades (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment [Line Items]
Total	$ 2,961,481	$ 2,838,288
Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	1,702,839	1,675,389
Commercial [Member] | Owner Occupied Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	583,261	575,816
Commercial [Member] | Non Owner Occupied Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	704,284	683,901
Commercial [Member] | Residential Spec Homes [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	7,254	16,591
Commercial [Member] | Development & Spec Land [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	43,889	49,996
Commercial [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	364,151	349,085
Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	724,771	703,643
Real Estate [Member] | Residential Mortgage [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	630,955	593,108
Real Estate [Member] | Residential Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	22,394	16,027
Real Estate [Member] | Mortgage Warehousing [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	71,422	94,508
Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	533,871	459,256
Consumer [Member] | Direct Installment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	37,895	36,737
Consumer [Member] | Indirect Installment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	303,579	227,659
Consumer [Member] | Home Equity Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	192,397	194,860
Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	$ 2,907,992	$ 2,771,306
Percentage of total loans	98.19%	97.64%
Pass [Member] | Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	$ 1,655,379	$ 1,617,467
Pass [Member] | Commercial [Member] | Owner Occupied Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	563,429	548,992
Pass [Member] | Commercial [Member] | Non Owner Occupied Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	692,995	675,030
Pass [Member] | Commercial [Member] | Residential Spec Homes [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	7,254	16,591
Pass [Member] | Commercial [Member] | Development & Spec Land [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	41,084	48,884
Pass [Member] | Commercial [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	350,617	327,970
Pass [Member] | Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	721,159	697,927
Pass [Member] | Real Estate [Member] | Residential Mortgage [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	627,343	587,614
Pass [Member] | Real Estate [Member] | Residential Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	22,394	15,805
Pass [Member] | Real Estate [Member] | Mortgage Warehousing [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	71,422	94,508
Pass [Member] | Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	531,454	455,912
Pass [Member] | Consumer [Member] | Direct Installment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	37,833	36,577
Pass [Member] | Consumer [Member] | Indirect Installment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	302,911	226,451
Pass [Member] | Consumer [Member] | Home Equity Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	190,710	192,884
Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	$ 18,834	$ 20,820
Percentage of total loans	0.64%	0.73%
Special Mention [Member] | Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	$ 18,834	$ 20,820
Special Mention [Member] | Commercial [Member] | Owner Occupied Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	5,176	8,622
Special Mention [Member] | Commercial [Member] | Non Owner Occupied Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	5,903	3,864
Special Mention [Member] | Commercial [Member] | Development & Spec Land [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	2,734	886
Special Mention [Member] | Commercial [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	5,021	7,448
Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	$ 34,655	$ 46,162
Percentage of total loans	1.17%	1.63%
Substandard [Member] | Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	$ 28,626	$ 37,102
Substandard [Member] | Commercial [Member] | Owner Occupied Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	14,656	18,202
Substandard [Member] | Commercial [Member] | Non Owner Occupied Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	5,386	5,007
Substandard [Member] | Commercial [Member] | Development & Spec Land [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	71	226
Substandard [Member] | Commercial [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	8,513	13,667
Substandard [Member] | Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	3,612	5,716
Substandard [Member] | Real Estate [Member] | Residential Mortgage [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	3,612	5,494
Substandard [Member] | Real Estate [Member] | Residential Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Total		222
Substandard [Member] | Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	2,417	3,344
Substandard [Member] | Consumer [Member] | Direct Installment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	62	160
Substandard [Member] | Consumer [Member] | Indirect Installment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	668	1,208
Substandard [Member] | Consumer [Member] | Home Equity Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	$ 1,687	$ 1,976
Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Percentage of total loans	0.00%	0.00%

Repurchase Agreements - Summary

Repurchase Agreements - Summary of Repurchase Agreements Accounted as Secured Borrowings (Detail) $ in Thousands	Sep. 30, 2018USD ($)
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase Agreements	$ 56,629
Securities pledged for Repurchase Agreements, Total	62,002
Federal Agency Collateralized Mortgage Obligations [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Securities pledged for Repurchase Agreements, Total	32,535
Federal Agency Mortgage-backed Pools [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Securities pledged for Repurchase Agreements, Total	29,467
Remaining Contractual Maturity of the Agreements, Overnight and Continuous [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase Agreements	56,629
Securities pledged for Repurchase Agreements, Total	62,002
Remaining Contractual Maturity of the Agreements, Overnight and Continuous [Member] | Federal Agency Collateralized Mortgage Obligations [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Securities pledged for Repurchase Agreements, Total	32,535
Remaining Contractual Maturity of the Agreements, Overnight and Continuous [Member] | Federal Agency Mortgage-backed Pools [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Securities pledged for Repurchase Agreements, Total	$ 29,467

Derivative Financial Instrume_3

Derivative Financial Instruments - Additional Information (Detail) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Derivative [Line Items]
LIBOR period	3 months
Weighted average fixed rate	5.81%
Recorded period of effectiveness of cash flow hedges on net income	12 months
Recorded period of effectiveness of fair value hedges on net income	12 months
Recorded period of effectiveness of fair value of derivatives on net income	12 months
Interest Rate Swap [Member]
Derivative [Line Items]
LIBOR period	1 month
Weighted average fixed rate	2.81%
LaPorte Bancorp Inc [Member]
Derivative [Line Items]
LIBOR period	1 month
Weighted average fixed rate	2.31%
Cash Flow Hedging [Member]
Derivative [Line Items]
Notional amount of interest	$ 30.5	$ 30.5
Cash Flow Hedging [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Notional amount of interest	50
Cash Flow Hedging [Member] | LaPorte Bancorp Inc [Member]
Derivative [Line Items]
Notional amount of interest	30	30
Derivative in Fair Value Hedging Relationship [Member]
Derivative [Line Items]
Notional amount of interest	$ 205.8	$ 154.6

Derivative Financial Instrume_4

Derivative Financial Instruments - Fair Value of Derivative Financial Instruments (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Derivatives, Fair Value [Line Items]
Total Asset Derivatives	$ 5,173	$ 954
Total Liability Derivatives	5,010	2,542
Derivatives Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Total Asset Derivatives	4,942	811
Total Liability Derivatives	4,918	2,539
Derivatives Designated as Hedging Instruments [Member] | Interest Rate Contracts One [Member] | Loans [Member]
Derivatives, Fair Value [Line Items]
Total Liability Derivatives	4,918	811
Derivatives Designated as Hedging Instruments [Member] | Interest Rate Contracts One [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Total Asset Derivatives	4,918
Derivatives Designated as Hedging Instruments [Member] | Interest Rate Contracts Two [Member] | Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Total Liability Derivatives		1,728
Derivatives Designated as Hedging Instruments [Member] | Interest Rate Contracts Two [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Total Asset Derivatives	24	811
Derivatives Not Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Total Asset Derivatives	231	143
Total Liability Derivatives	92	3
Derivatives Not Designated as Hedging Instruments [Member] | Mortgage Loan Contracts [Member] | Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Total Liability Derivatives	92	3
Derivatives Not Designated as Hedging Instruments [Member] | Mortgage Loan Contracts [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Total Asset Derivatives	$ 231	$ 143

Derivative Financial Instrume_5

Derivative Financial Instruments - Effect of Derivative Instruments on Condensed Consolidated Statements of Income Derivative in Cash Flow Hedging Relationship (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Comprehensive Income on Derivative (Effective Portion)	$ 639	$ 297	$ 1,752	$ 743
Cash Flow Hedging [Member] | Interest Rate Contracts One [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Comprehensive Income on Derivative (Effective Portion)	$ 505	$ 193	$ 1,384	$ 483

Derivative Financial Instrume_6

Derivative Financial Instruments - Effect of Derivative Instruments on Consolidated Statements of Income Derivative in Fair Value Hedging Relationship (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Interest Income - Loans [Member] | Derivative in Fair Value Hedging Relationship [Member] | Interest Rate Contracts One [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized on Derivative	$ 2,768	$ (4)	$ 574	$ 423
Interest Income - Loans [Member] | Derivative in Fair Value Hedging Relationship [Member] | Interest Rate Contracts Two [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized on Derivative	(2,768)	4	(574)	(423)
Derivatives Not Designated as Hedging Instruments [Member] | Other income - Gain on Sale of Loans [Member] | Mortgage Loan Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized on Derivative	$ 112	$ (112)	$ 195	$ (324)

Disclosures about Fair Value _3

Disclosures about Fair Value of Assets and Liabilities - Fair Value Measurements of Assets and Liabilities Recognized on a Recurring Basis (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total available-for-sale securities, Fair Value	$ 542,305	$ 509,665
U.S. Treasury and Federal Agencies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total available-for-sale securities, Fair Value	16,572	19,052
State and Municipal [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total available-for-sale securities, Fair Value	156,675	149,564
Federal Agency Collateralized Mortgage Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total available-for-sale securities, Fair Value	172,671	130,365
Federal Agency Mortgage-backed Pools [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total available-for-sale securities, Fair Value	185,975	208,657
Corporate Notes [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total available-for-sale securities, Fair Value	10,412	385
Private Labeled Mortgage-backed Pools [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total available-for-sale securities, Fair Value		1,642
Recurring Basis [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total available-for-sale securities, Fair Value	542,305	509,665
Recurring Basis [Member] | U.S. Treasury and Federal Agencies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total available-for-sale securities, Fair Value	16,572	19,052
Recurring Basis [Member] | State and Municipal [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total available-for-sale securities, Fair Value	156,675	149,564
Recurring Basis [Member] | Federal Agency Collateralized Mortgage Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total available-for-sale securities, Fair Value	172,671	130,365
Recurring Basis [Member] | Federal Agency Mortgage-backed Pools [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total available-for-sale securities, Fair Value	185,975	208,657
Recurring Basis [Member] | Corporate Notes [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total available-for-sale securities, Fair Value	10,412	385
Recurring Basis [Member] | Private Labeled Mortgage-backed Pools [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total available-for-sale securities, Fair Value		1,642
Recurring Basis [Member] | Hedged Loans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives, fair value	205,778	154,575
Recurring Basis [Member] | Forward Sale Commitments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives, fair value	231	143
Recurring Basis [Member] | Interest Rate Swap [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives, fair value	4,942	(917)
Recurring Basis [Member] | Commitments To Originate Loans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives, fair value	(92)	(3)
Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total available-for-sale securities, Fair Value	542,305	509,665
Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | U.S. Treasury and Federal Agencies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total available-for-sale securities, Fair Value	16,572	19,052
Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | State and Municipal [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total available-for-sale securities, Fair Value	156,675	149,564
Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Federal Agency Collateralized Mortgage Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total available-for-sale securities, Fair Value	172,671	130,365
Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Federal Agency Mortgage-backed Pools [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total available-for-sale securities, Fair Value	185,975	208,657
Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Corporate Notes [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total available-for-sale securities, Fair Value	10,412	385
Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Private Labeled Mortgage-backed Pools [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total available-for-sale securities, Fair Value		1,642
Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Hedged Loans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives, fair value	205,778	154,575
Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Forward Sale Commitments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives, fair value	231	143
Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Interest Rate Swap [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives, fair value	4,942	(917)
Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Commitments To Originate Loans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives, fair value	$ (92)	$ (3)

Disclosures about Fair Value _4

Disclosures about Fair Value of Assets and Liabilities - Realized Gains and Losses included in Net Income for Periods in Condensed Consolidated Statements of Income (Detail) - Non Interest Income Total Gains and Losses [Member] - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Included in net income	$ (184)	$ (112)	$ (1)	$ (324)
Hedged Loans [Member]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Included in net income	364	(4)	4,108	423
Interest Rate Swap [Member]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Included in net income	(364)	4	(4,108)	(423)
Derivative Loan Commitments [Member]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Included in net income	$ (184)	$ (112)	$ (1)	$ (324)

Disclosures about Fair Value _5

Disclosures about Fair Value of Assets and Liabilities - Other Assets Measured at Fair Value on Non-recurring Basis (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Fair Value	$ 12,044
Significant Unobservable Inputs (Level 3) [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Fair Value	12,044
Significant Unobservable Inputs (Level 3) [Member] | Impaired Loans [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Fair Value	7,431	$ 6,957
Significant Unobservable Inputs (Level 3) [Member] | Mortgage Servicing Rights [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Fair Value	12,044	11,602
Fair Value, Measurements, Nonrecurring [Member] | Impaired Loans [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Fair Value	7,431	6,957
Fair Value, Measurements, Nonrecurring [Member] | Mortgage Servicing Rights [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Fair Value		11,602
Fair Value, Measurements, Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Impaired Loans [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Fair Value	$ 7,431	6,957
Fair Value, Measurements, Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Mortgage Servicing Rights [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Fair Value		$ 11,602

Disclosures about Fair Value _6

Disclosures about Fair Value of Assets and Liabilities - Additional Information (Detail) - USD ($)	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Fair Value Disclosures [Abstract]
Reduced in carrying amount of mortgage servicing rights	$ 26,000	$ 75,000

Disclosures about Fair Value _7

Disclosures about Fair Value of Assets and Liabilities - Qualitative Information about Unobservable Inputs Used in Recurring and Non-recurring Level 3 Fair Value Measurements, Other than Goodwill (Detail) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2018USD ($)	Dec. 31, 2017USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	$ 12,044
Significant Unobservable Inputs (Level 3) [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	12,044
Significant Unobservable Inputs (Level 3) [Member] | Impaired Loans [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	$ 7,431	$ 6,957
Valuation Technique	Collateral based measurement
Impaired loans	Discount to reflect current market conditions and ultimate collectability
Significant Unobservable Inputs (Level 3) [Member] | Mortgage Servicing Rights [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	$ 12,044	$ 11,602
Valuation Technique	Discounted cash flows
Impaired loans	Discount rate, Constant prepayment rate, Probability of default
Minimum [Member] | Significant Unobservable Inputs (Level 3) [Member] | Impaired Loans [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Discount to reflect current market conditions and ultimate collectability	0.00%	0.00%
Minimum [Member] | Significant Unobservable Inputs (Level 3) [Member] | Mortgage Servicing Rights [Member] | Measurement Input, Discount Rate [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Unobservable inputs	10.3	9.6
Minimum [Member] | Significant Unobservable Inputs (Level 3) [Member] | Mortgage Servicing Rights [Member] | Measurement Input, Constant Prepayment Rate [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Unobservable inputs	9.3	9.2
Minimum [Member] | Significant Unobservable Inputs (Level 3) [Member] | Mortgage Servicing Rights [Member] | Measurement Input, Default Rate [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Unobservable inputs	0.1	0
Maximum [Member] | Significant Unobservable Inputs (Level 3) [Member] | Impaired Loans [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Discount to reflect current market conditions and ultimate collectability	100.00%	46.80%
Maximum [Member] | Significant Unobservable Inputs (Level 3) [Member] | Mortgage Servicing Rights [Member] | Measurement Input, Discount Rate [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Unobservable inputs	11.3	10.8
Maximum [Member] | Significant Unobservable Inputs (Level 3) [Member] | Mortgage Servicing Rights [Member] | Measurement Input, Constant Prepayment Rate [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Unobservable inputs	14.9	27.7
Maximum [Member] | Significant Unobservable Inputs (Level 3) [Member] | Mortgage Servicing Rights [Member] | Measurement Input, Default Rate [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Unobservable inputs	0.8	1.5
Weighted Average [Member] | Significant Unobservable Inputs (Level 3) [Member] | Impaired Loans [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Discount to reflect current market conditions and ultimate collectability	11.10%	2.60%
Weighted Average [Member] | Significant Unobservable Inputs (Level 3) [Member] | Mortgage Servicing Rights [Member] | Measurement Input, Discount Rate [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Unobservable inputs	10.3	9.7
Weighted Average [Member] | Significant Unobservable Inputs (Level 3) [Member] | Mortgage Servicing Rights [Member] | Measurement Input, Constant Prepayment Rate [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Unobservable inputs	9.5	10.5
Weighted Average [Member] | Significant Unobservable Inputs (Level 3) [Member] | Mortgage Servicing Rights [Member] | Measurement Input, Default Rate [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Unobservable inputs	0.6	0.2

Fair Value of Financial Instr_3

Fair Value of Financial Instruments - Summary of Estimated Fair Values of Financial Instruments (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Assets
Cash and due from banks	$ 69,697	$ 76,441
Investment securities, held to maturity	223,848	200,448
Loans held for sale	1,980	3,094
Loans (excluding loan level hedges), net	2,949,681	2,824,827
Stock in FHLB	18,073	18,105
Interest receivable	13,999	16,244
Liabilities
Non-interest bearing deposits	621,475	601,805
Interest bearing deposits	2,507,079	2,279,198
Borrowings	477,719	564,157
Subordinated debentures	37,791	37,653
Interest payable	1,688	886
Carrying Amount [Member]
Assets
Cash and due from banks	69,697	76,441
Investment securities, held to maturity	223,848	200,448
Loans held for sale	1,980	3,094
Loans (excluding loan level hedges), net	2,733,810	2,661,026
Stock in FHLB	18,073	18,105
Interest receivable	13,999	16,244
Liabilities
Non-interest bearing deposits	621,475	601,805
Interest bearing deposits	2,507,079	2,279,198
Borrowings	477,719	564,157
Subordinated debentures	37,791	37,653
Interest payable	1,688	886
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Assets
Cash and due from banks	69,697	76,441
Liabilities
Non-interest bearing deposits	621,475	601,805
Significant Other Observable Inputs (Level 2) [Member]
Assets
Investment securities, held to maturity	219,158	201,085
Stock in FHLB	18,073	18,105
Interest receivable	13,999	16,244
Liabilities
Interest bearing deposits	2,373,715	2,156,487
Borrowings	471,265	560,057
Subordinated debentures	35,811	35,994
Interest payable	1,688	886
Significant Unobservable Inputs (Level 3) [Member]
Assets
Loans held for sale	1,980	3,094
Loans (excluding loan level hedges), net	$ 2,610,426	$ 2,585,879

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Income - Components of Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Tax effect	$ 3,447	$ 1,914
Total accumulated other comprehensive loss	(12,963)	(3,551)
Unrealized Gain (Loss) on Securities Available for Sale [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss), before tax	(16,481)	(3,937)
Unamortized Gain on Securities Held to Maturity, Previously Transferred from AFS [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss), before tax	47	200
Unrealized Loss on Derivative Instruments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss), before tax	$ 24	$ (1,728)

Regulatory Capital - Summary of

Regulatory Capital - Summary of Regulatory Capital Requirement (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total capital (to risk-weighted assets), Actual, Amount	$ 417,728	$ 384,800
Total capital (to risk-weighted assets), Actual, Ratio	13.31%	12.91%
Total capital (to risk-weighted assets), For capital adequacy purposes, Amount	$ 251,097	$ 238,543
Total capital (to risk-weighted assets), For capital adequacy purposes, Ratio	8.00%	8.00%
Total capital (to risk-weighted assets), Required for capital1 adequacy purposes with capital buffer, Amount	$ 290,331	$ 275,816
Total capital (to risk-weighted assets), Required for capital1 adequacy purposes with capital buffer, Ratio	9.25%	9.25%
Tier 1 capital (to average assets), Actual, Amount	$ 399,885	$ 368,355
Tier 1 capital (to average assets), Actual, Ratio	12.74%	12.35%
Tier 1 capital (to average assets), For capital adequacy purposes, Amount	$ 188,323	$ 178,907
Tier 1 capital (to average assets), For capital adequacy purpose, Ratio	6.00%	6.00%
Tier 1 capital (to average assets), Required for capital1 adequacy purposes with capital buffer, Amount	$ 227,557	$ 216,180
Tier 1 capital (to average assets), Required for capital1 adequacy purposes with capital buffer, Ratio	7.25%	7.25%
Common equity tier 1 capital, Actual Amount	$ 361,422	$ 329,892
Common equity tier 1 capital, Actual Ratio	11.52%	11.06%
Common equity tier 1 capital,For capital adequacy purposes, Amount	$ 141,242	$ 134,181
Common equity tier 1 capital, For capital adequacy purpose, Ratio	4.50%	4.50%
Common equity tier 1 capital (to risk-weighted assets), Required for capital1 adequacy purposes with capital buffer, Amount	$ 180,476	$ 171,454
Common equity tier 1 capital (to risk-weighted assets), Required for capital1 adequacy purposes with capital buffer, Ratio	5.75%	5.75%
Tier 1 capital (to average assets), Actual, Amount	$ 399,885	$ 368,355
Tier 1 capital (to average assets), Actual, Ratio	10.05%	9.92%
Tier 1 capital (to average assets), For capital adequacy purposes, Amount	$ 159,098	$ 148,503
Tier 1 capital (to average assets), For capital adequacy purpose, Ratio	4.00%	4.00%
Tier 1 capital (to average assets), Required for capital1 adequacy purposes with capital buffer, Amount	$ 159,098	$ 148,503
Tier 1 capital (to average assets), Required for capital1 adequacy purposes with capital buffer, Ratio	4.00%	4.00%
Bank [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total capital (to risk-weighted assets), Actual, Amount	$ 397,610	$ 382,788
Total capital (to risk-weighted assets), Actual, Ratio	12.66%	12.85%
Total capital (to risk-weighted assets), For capital adequacy purposes, Amount	$ 251,262	$ 238,386
Total capital (to risk-weighted assets), For capital adequacy purposes, Ratio	8.00%	8.00%
Total capital (to risk-weighted assets), Required for capital1 adequacy purposes with capital buffer, Amount	$ 290,522	$ 275,634
Total capital (to risk-weighted assets), Required for capital1 adequacy purposes with capital buffer, Ratio	9.25%	9.25%
Total capital (to risk-weighted assets), For well capitalized purpose, Amount	$ 314,078	$ 297,982
Total capital (to risk-weighted assets), For well capitalized purpose, Ratio	10.00%	10.00%
Tier 1 capital (to average assets), Actual, Amount	$ 379,767	$ 366,343
Tier 1 capital (to average assets), Actual, Ratio	12.09%	12.29%
Tier 1 capital (to average assets), For capital adequacy purposes, Amount	$ 188,447	$ 178,790
Tier 1 capital (to average assets), For capital adequacy purpose, Ratio	6.00%	6.00%
Tier 1 capital (to average assets), Required for capital1 adequacy purposes with capital buffer, Amount	$ 227,706	$ 216,038
Tier 1 capital (to average assets), Required for capital1 adequacy purposes with capital buffer, Ratio	7.25%	7.25%
Tier 1 capital (to average assets), For well capitalized purpose, Amount	$ 251,262	$ 238,386
Tier 1 capital (to average assets), For well capitalized purposes, Ratio	8.00%	8.00%
Common equity tier 1 capital, Actual Amount	$ 379,767	$ 366,343
Common equity tier 1 capital, Actual Ratio	12.09%	12.29%
Common equity tier 1 capital,For capital adequacy purposes, Amount	$ 141,335	$ 134,092
Common equity tier 1 capital, For capital adequacy purpose, Ratio	4.50%	4.50%
Common equity tier 1 capital (to risk-weighted assets), Required for capital1 adequacy purposes with capital buffer, Amount	$ 180,595	$ 171,340
Common equity tier 1 capital (to risk-weighted assets), Required for capital1 adequacy purposes with capital buffer, Ratio	5.75%	5.75%
Common equity tier 1 capital, For well capitalized purpose, Amount	$ 204,150	$ 193,689
Common equity tier 1 capital, For well capitalized purposes, Ratio	6.50%	6.50%
Tier 1 capital (to average assets), Actual, Amount	$ 379,767	$ 366,343
Tier 1 capital (to average assets), Actual, Ratio	9.53%	9.89%
Tier 1 capital (to average assets), For capital adequacy purposes, Amount	$ 159,405	$ 148,116
Tier 1 capital (to average assets), For capital adequacy purpose, Ratio	4.00%	4.00%
Tier 1 capital (to average assets), Required for capital1 adequacy purposes with capital buffer, Amount	$ 159,405	$ 148,116
Tier 1 capital (to average assets), Required for capital1 adequacy purposes with capital buffer, Ratio	4.00%	4.00%
Tier 1 capital (to average assets), For well capitalized purpose, Amount	$ 199,257	$ 185,145
Tier 1 capital (to average assets), For well capitalized purposes, Ratio	5.00%	5.00%

Business Combinations - Additio

Business Combinations - Additional Information (Detail) - Salin Bancshares, Inc [Member] - USD ($) $ / shares in Units, $ in Millions	Oct. 29, 2018	Oct. 26, 2018	Sep. 30, 2018
Business Acquisition [Line Items]
Total assets			$ 918.4
Total deposits			752.1
Total loans			$ 595.7
Subsequent Event [Member]
Business Acquisition [Line Items]
Exchange ratio per share	23907.50%
Cash paid for each share	$ 84,417.17
Market closing price per share		$ 16.95
Estimated transaction value		$ 135.3