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Loans - Amounts of Loans (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Mortgage warehouse | $ 3,634,596 | $ 3,011,570 |  |
Total loans | 3,636,841 | 3,013,332 |  |
Allowance for loan losses | (17,667) | (17,820) | $ (16,394) | $ (14,837)
Loans, net | 3,619,174 | 2,995,512 |  |
Commercial [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Commercial/Consumer, Total | 2,046,651 | 1,721,590 |  |
Mortgage warehouse | 2,047,646 | 1,722,552 |  |
Real Estate [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Real Estate, Total | 770,717 | 668,141 |  |
Mortgage warehouse | 920,998 | 742,244 |  |
Consumer [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Commercial/Consumer, Total | 669,180 | 549,481 |  |
Mortgage warehouse | 665,952 | 546,774 |  |
Working Capital and Equipment [Member] | Commercial [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Commercial/Consumer, Total | 938,317 | 804,083 |  |
Real Estate Including Agriculture [Member] | Commercial [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Commercial/Consumer, Total | 978,891 | 834,037 |  |
Tax Exempt Loans Receivable [Member] | Commercial [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Commercial/Consumer, Total | 63,571 | 48,975 |  |
Other Commercial Loans [Member] | Commercial [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Commercial/Consumer, Total | 65,872 | 34,495 |  |
1-4 Family [Member] | Real Estate [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Real Estate, Total | 762,571 | 659,754 |  |
Other Real Estate Loans [Member] | Real Estate [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Real Estate, Total | 8,146 | 8,387 |  |
Auto [Member] | Consumer [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Commercial/Consumer, Total | 362,729 | 327,413 |  |
Recreation Consumer Loans Receivable [Member] | Consumer [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Commercial/Consumer, Total | 16,262 | 13,975 |  |
Real Estate Home Improvement Loans Receivable [Member] | Consumer [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Commercial/Consumer, Total | 43,585 | 39,587 |  |
Home Equity Loan [Member] | Consumer [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Commercial/Consumer, Total | 237,979 | 163,209 |  |
Mortgage warehouse | 276,215 | 197,494 |  |
Unsecured Debt [Member] | Consumer [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Commercial/Consumer, Total | 7,286 | 4,043 |  |
Other Consumer Loans [Member] | Consumer [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Commercial/Consumer, Total | 1,339 | 1,254 |  |
Mortgage Warehouse Loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Mortgage warehouse | $ 150,293 | $ 74,120 |  |

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