Loans and Lease Finance Receivables and Allowance for Loan Losses - Summary of Components of Loans and Lease Finance Receivables, Excluding PCI 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]
Gross loans, excluding PCI loans, net of deferred loan fees	$ 7,606,863	$ 7,764,611
Less: Allowance for loan losses	(65,201)	(63,613)	$ (59,935)	$ (59,585)
Total loans and lease finance receivables	7,541,662	7,700,998
PCI Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and industrial	616	519
PCI Loans	15,356	17,214
SBA	1,235	1,258
Discount on PCI loans	0	0
Commercial real estate	13,183	14,407
Construction	0	0
SFR mortgage	141	145
Dairy & livestock and agribusiness	0	700
Municipal lease finance receivables	0	0
Consumer and other loans	181	185
Less: Allowance for loan losses	(180)	(204)	$ (312)	$ (367)
Net loans	15,176	17,010
Loans, Excluding PCI Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and industrial	957,126	1,002,209
SBA	337,957	350,043
Commercial real estate	5,388,866	5,394,229
Construction	121,912	122,782
SFR mortgage	285,787	296,504
Dairy & livestock and agribusiness	322,321	393,843
Municipal lease finance receivables	61,249	64,186
Consumer and other loans	120,768	128,429
Total gross loans, excluding PCI loans	7,595,986	7,752,225
Less: Deferred loan fees, net	(4,479)	(4,828)
Gross loans, excluding PCI loans, net of deferred loan fees	7,591,507	7,747,397
Less: Allowance for loan losses	(65,021)	(63,409)
Net loans	$ 7,526,486	$ 7,683,988

Discount on purchased credit impaired loans.

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Gross purchased credit impaired loans.

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Net loans.

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Loans receivable construction.

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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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Amount before allowance of loans and leases issued to a unit or agency of a federal, state or local jurisdiction within the country of domicile of the reporting entity. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

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Amount before allowance of consumer mortgage. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes subordinated loans such as home equity lines of credit and loans and leases covered under loss sharing agreements.

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Amount before allowance of consumer loans and leases not otherwise specified in the taxonomy. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

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Amount of deferred interest and fee income, unamortized costs incurred to originate loans and leases, unamortized loan commitments and loan syndication fees, and premiums over or discounts from face amounts of acquired loans. Excludes amounts for loans and leases covered under loss sharing agreements.

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Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

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Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements.

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Amount before allowance of loans issued to agricultural institutions. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans covered under loss sharing agreements.

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Amount before allowance of mortgage loans on existing land or building. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans covered under loss sharing agreements.

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