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Loans and Allowance for Loan Losses - Schedule of Allowance for Loan Losses by Portfolio Segment Allowance (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Apr. 22, 2019
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Financing Receivable Allowance For Credit Losses [Line Items]          
Allowance for Loan Losses, Beginning Balance   $ 26,340 $ 9,316 $ 11,454 $ 8,498
Provision for loan losses $ 14,500 974 750 16,620 1,920
Loans charged-off   (9,744) (512) (10,682) (1,018)
Recoveries   207 529 385 683
Allowance for Loan Losses, Ending Balance   17,777 10,083 17,777 10,083
Commercial Real Estate [Member]          
Financing Receivable Allowance For Credit Losses [Line Items]          
Allowance for Loan Losses, Beginning Balance   4,528 3,010 4,662 2,740
Provision for loan losses   719 216 585 507
Loans charged-off   (582)   (608) (29)
Recoveries   47 269 73 277
Allowance for Loan Losses, Ending Balance   4,712 3,495 4,712 3,495
Commercial and Industrial [Member]          
Financing Receivable Allowance For Credit Losses [Line Items]          
Allowance for Loan Losses, Beginning Balance   16,056 2,388 2,707 2,136
Provision for loan losses   135 (64) 13,930 196
Loans charged-off   (8,244) (77) (8,738) (86)
Recoveries   1 7 49 8
Allowance for Loan Losses, Ending Balance   7,948 2,254 7,948 2,254
Residential Real Estate [Member]          
Financing Receivable Allowance For Credit Losses [Line Items]          
Allowance for Loan Losses, Beginning Balance   3,617 2,442 2,320 2,262
Provision for loan losses   (272) 185 1,129 475
Loans charged-off   (465) (148) (579) (271)
Recoveries   28 184 38 197
Allowance for Loan Losses, Ending Balance   2,908 2,663 2,908 2,663
Agricultural Real Estate [Member]          
Financing Receivable Allowance For Credit Losses [Line Items]          
Allowance for Loan Losses, Beginning Balance   494 267 391 319
Provision for loan losses   59 147 168 92
Loans charged-off   (28) (80) (34) (80)
Recoveries         3
Allowance for Loan Losses, Ending Balance   525 334 525 334
Consumer [Member]          
Financing Receivable Allowance For Credit Losses [Line Items]          
Allowance for Loan Losses, Beginning Balance   1,347 878 1,070 768
Provision for loan losses   257 247 732 535
Loans charged-off   (389) (203) (681) (509)
Recoveries   129 61 223 189
Allowance for Loan Losses, Ending Balance   1,344 983 1,344 983
Agricultural [Member]          
Financing Receivable Allowance For Credit Losses [Line Items]          
Allowance for Loan Losses, Beginning Balance   298 331 304 273
Provision for loan losses   76 19 76 115
Loans charged-off   (36) (4) (42) (43)
Recoveries   2 8 2 9
Allowance for Loan Losses, Ending Balance   $ 340 $ 354 $ 340 $ 354