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Loans - Amounts of Loans (Detail) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Mortgage warehouse | $ 71,944 | $ 74,120 |  |
Total loans | 3,621,057 | 3,013,332 |  |
Allowance for loan losses | (17,821) | (17,820) | $ (16,474) | $ (16,394)
Loans, net | 3,603,236 | 2,995,512 |  |
Commercial [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Commercial/Consumer, Total | 2,089,579 | 1,721,590 |  |
Real Estate [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Real Estate, Total | 819,824 | 668,141 |  |
Consumer [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Commercial/Consumer, Total | 639,710 | 549,481 |  |
Working Capital and Equipment [Member] | Commercial [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Commercial/Consumer, Total | 924,435 | 804,083 |  |
Real Estate Including Agriculture [Member] | Commercial [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Commercial/Consumer, Total | 1,076,077 | 834,037 |  |
Tax Exempt Loans Receivable [Member] | Commercial [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Commercial/Consumer, Total | 60,062 | 48,975 |  |
Other Commercial Loans [Member] | Commercial [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Commercial/Consumer, Total | 29,005 | 34,495 |  |
1-4 Family [Member] | Real Estate [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Real Estate, Total | 808,401 | 659,754 |  |
Other Real Estate Loans [Member] | Real Estate [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Real Estate, Total | 11,423 | 8,387 |  |
Auto [Member] | Consumer [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Commercial/Consumer, Total | 331,572 | 327,413 |  |
Recreation Consumer Loans Receivable [Member] | Consumer [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Commercial/Consumer, Total | 14,262 | 13,975 |  |
Real Estate Home Improvement Loans Receivable [Member] | Consumer [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Commercial/Consumer, Total | 40,998 | 39,587 |  |
Home Equity Loan [Member] | Consumer [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Commercial/Consumer, Total | 245,940 | 163,209 |  |
Unsecured Debt [Member] | Consumer [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Commercial/Consumer, Total | 4,124 | 4,043 |  |
Other Consumer Loans [Member] | Consumer [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Commercial/Consumer, Total | $ 2,814 | $ 1,254 |  |

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