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Loans - Amounts of Loans (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Jun. 30, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage warehouse	$ 3,665,343		$ 3,012,553
Total loans	3,666,625		3,013,332
Allowance for loan losses	(17,956)	$ (18,305)	(17,820)	$ (17,798)	$ (17,071)	$ (16,394)
Loans, net	3,648,669		2,995,512
Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial/Consumer, Total	2,046,165		1,721,590
Mortgage warehouse	2,048,035		1,723,535
Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Real Estate, Total	796,497		668,141
Mortgage warehouse	952,116		742,244
Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial/Consumer, Total	668,332		549,481
Mortgage warehouse	665,192		546,774
Working Capital and Equipment [Member] | Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial/Consumer, Total	915,449		804,083
Real Estate Including Agriculture [Member] | Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial/Consumer, Total	1,005,124		834,037
Tax Exempt Loans Receivable [Member] | Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial/Consumer, Total	59,620		48,975
Other Commercial Loans [Member] | Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial/Consumer, Total	65,972		34,495
1-4 Family [Member] | Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Real Estate, Total	788,574		659,754
Other Real Estate Loans [Member] | Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Real Estate, Total	7,923		8,387
Auto [Member] | Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial/Consumer, Total	358,792		327,413
Recreation Consumer Loans Receivable [Member] | Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial/Consumer, Total	16,396		13,975
Real Estate Home Improvement Loans Receivable [Member] | Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial/Consumer, Total	44,105		39,587
Home Equity Loan [Member] | Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial/Consumer, Total	239,041		163,209
Mortgage warehouse	278,577		198,364
Unsecured Debt [Member] | Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial/Consumer, Total	6,986		4,043
Other Consumer Loans [Member] | Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial/Consumer, Total	3,012		1,254
Mortgage Warehouse Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage warehouse	$ 155,631		$ 74,120

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Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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