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Loans - Amounts of Loans (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Mortgage warehouse | $ 74,120 | $ 94,508 |  |
Total loans | 3,013,332 | 2,835,180 |  |
Allowance for loan losses | (17,820) | (16,394) | $ (14,837) | $ (14,534)
Loans, net | 2,995,512 | 2,818,786 |  |
Commercial [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Commercial/Consumer, Total | 1,721,590 | 1,669,934 |  |
Real Estate [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Real Estate, Total | 668,141 | 609,739 |  |
Consumer [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Commercial/Consumer, Total | 549,481 | 460,999 |  |
Working Capital and Equipment [Member] | Commercial [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Commercial/Consumer, Total | 804,083 | 720,477 |  |
Real Estate Including Agriculture [Member] | Commercial [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Commercial/Consumer, Total | 834,037 | 880,861 |  |
Tax Exempt Loans Receivable [Member] | Commercial [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Commercial/Consumer, Total | 48,975 | 36,324 |  |
Other Commercial Loans [Member] | Commercial [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Commercial/Consumer, Total | 34,495 | 32,272 |  |
1-4 Family [Member] | Real Estate [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Real Estate, Total | 659,754 | 602,196 |  |
Other Real Estate Loans [Member] | Real Estate [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Real Estate, Total | 8,387 | 7,543 |  |
Auto [Member] | Consumer [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Commercial/Consumer, Total | 327,413 | 244,003 |  |
Recreation Consumer Loans Receivable [Member] | Consumer [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Commercial/Consumer, Total | 13,975 | 8,728 |  |
Real Estate Home Improvement Loans Receivable [Member] | Consumer [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Commercial/Consumer, Total | 39,587 | 37,052 |  |
Home Equity Loan [Member] | Consumer [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Commercial/Consumer, Total | 163,209 | 165,240 |  |
Unsecured Debt [Member] | Consumer [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Commercial/Consumer, Total | 4,043 | 3,479 |  |
Other Consumer Loans [Member] | Consumer [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Commercial/Consumer, Total | $ 1,254 | $ 2,497 |  |

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