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Condensed Financial Information (Parent Company Only) - Condensed Statements of Cash Flows (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Operating Activities                      
Net income $ 18,543 $ 20,537 $ 16,642 $ 10,816 $ 13,133 $ 13,065 $ 14,115 $ 12,804 $ 66,538 $ 53,117 $ 33,117
Items not requiring (providing) cash                      
Change in Share based compensation                 215 251 325
Other assets                 97,629 2,460 6,173
Other liabilities                 (608) 658 (5,776)
Net cash provided by operating activities                 174,952 72,440 49,064
Investing Activities                      
Net cash provided by (used in) investing activities                 (94,725) (303,916) (278,924)
Financing Activities                      
Net change in borrowings                 (71,040) (13,589) 259,895
Dividends paid on common shares                 (20,835) (15,418) (11,720)
Proceeds from issuance of stock                 1,705 622 1,604
Net cash provided by (used in) financing activities                 (39,888) 229,988 236,419
Cash and Cash Equivalents, Beginning of Period       58,492       59,980 58,492 59,980 53,421
Cash and Cash Equivalents, End of Period 98,831       58,492       98,831 58,492 59,980
Lafayette Community Bancorp [Member]                      
Investing Activities                      
Acquisition of businesses                     20,425
Wolverine Bancorp Inc [Member]                      
Investing Activities                      
Acquisition of businesses                     12,723
Parent Company [Member]                      
Operating Activities                      
Net income                 66,538 53,117 33,117
Items not requiring (providing) cash                      
Equity in undistributed net income of subsidiaries                 (25,053) (9,643) (8,804)
Change in Share based compensation                 215 251 325
Amortization of unearned compensation                 705 169 135
Other assets                 (5,449) 132 388
Other liabilities                 1,629 378 (1,675)
Net cash provided by operating activities                 38,585 44,404 23,486
Investing Activities                      
Repurchase of outstanding stock                 (1,595)    
Net cash provided by (used in) investing activities                 755   (8,942)
Financing Activities                      
Net change in borrowings                 98 (12,316) (6,803)
Dividends paid on common shares                 (20,835) (15,418) (11,720)
Proceeds from issuance of stock                 1,705 622 1,604
Net cash provided by (used in) financing activities                 (19,032) (27,112) (16,919)
Net Change in Cash and Cash Equivalents                 20,308 17,292 (2,375)
Cash and Cash Equivalents, Beginning of Period       $ 30,653       $ 13,361 30,653 13,361 15,736
Cash and Cash Equivalents, End of Period $ 50,961       $ 30,653       50,961 $ 30,653 13,361
Parent Company [Member] | Lafayette Community Bancorp [Member]                      
Investing Activities                      
Acquisition of businesses                     (1,254)
Parent Company [Member] | Wolverine Bancorp Inc [Member]                      
Investing Activities                      
Acquisition of businesses                     $ (7,688)
Parent Company [Member] | Salin [Member]                      
Investing Activities                      
Acquisition of businesses                 $ 2,350