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Loans - Amounts of Loans (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Mortgage warehouse | $ 94,508 | $ 135,727 |  |
Total loans | 2,831,995 | 2,135,986 |  |
Allowance for loan losses | (16,394) | (14,837) | $ (14,534) | $ (16,501)
Loans, net | 2,815,601 | 2,121,149 |  |
Commercial [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Commercial/Consumer, Total | 1,617,870 | 1,069,956 |  |
Real Estate [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Real Estate, Total | 606,760 | 531,874 |  |
Consumer [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Commercial/Consumer, Total | 512,857 | 398,429 |  |
Working Capital and Equipment [Member] | Commercial [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Commercial/Consumer, Total | 696,612 | 539,403 |  |
Real Estate Including Agriculture [Member] | Commercial [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Commercial/Consumer, Total | 854,003 | 485,620 |  |
Tax Exempt Loans Receivable [Member] | Commercial [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Commercial/Consumer, Total | 36,324 | 15,486 |  |
Other Commercial Loans [Member] | Commercial [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Commercial/Consumer, Total | 30,931 | 29,447 |  |
1-4 Family [Member] | Real Estate [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Real Estate, Total | 599,217 | 526,024 |  |
Other Real Estate Loans [Member] | Real Estate [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Real Estate, Total | 7,543 | 5,850 |  |
Auto [Member] | Consumer [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Commercial/Consumer, Total | 251,020 | 174,773 |  |
Recreation Consumer Loans Receivable [Member] | Consumer [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Commercial/Consumer, Total | 8,752 | 5,669 |  |
Real Estate Home Improvement Loans Receivable [Member] | Consumer [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Commercial/Consumer, Total | 63,811 | 53,898 |  |
Home Equity Loan [Member] | Consumer [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Commercial/Consumer, Total | 165,240 | 144,508 |  |
Unsecured Debt [Member] | Consumer [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Commercial/Consumer, Total | 3,743 | 3,875 |  |
Other Consumer Loans [Member] | Consumer [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Commercial/Consumer, Total | $ 20,291 | $ 15,706 |  |

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