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	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans, excluding PCI loans	$ 2,910,000
Gross loans, excluding PCI loans, net of deferred loan fees	4,016,937	$ 3,817,067
Less: Allowance for loan losses	(59,156)	(59,825)
Total loans and lease finance receivables	3,957,781	3,757,242
PCI Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and industrial	7,473	14,605
PCI Loans	93,712	133,496
SBA	393	1,110
Discount on PCI loans	(3,872)	(7,129)
Commercial real estate	81,786	109,350
Construction	0	0
SFR mortgage	193	205
Dairy & livestock and agribusiness	1,429	4,890
Municipal lease finance receivables	0	0
Consumer and other loans	2,438	3,336
Net PCI loans	89,840	126,367
Loans, Excluding PCI Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and industrial	434,099	390,011
SBA	106,867	134,265
Commercial real estate	2,643,184	2,487,803
Construction	68,563	55,173
SFR mortgage	233,754	205,124
Dairy & livestock and agribusiness	305,509	279,173
Municipal lease finance receivables	74,135	77,834
Consumer and other loans	69,278	69,884
Total gross loans, excluding PCI loans	3,935,389	3,699,267
Less: Deferred loan fees, net	(8,292)	(8,567)
Gross loans, excluding PCI loans, net of deferred loan fees	3,927,097	3,690,700
Less: Allowance for loan losses	(59,156)	(59,825)	$ (75,235)	$ (92,441)
Net PCI loans	$ 3,867,941	$ 3,630,875

Discount on purchased credit impaired loans.

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Gross purchased credit impaired loans.

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Loans and leases receivable net amount.

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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 after allowance and 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 and loans held for sale.

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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 loans issued to commercial and industrial institutions. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes real estate loans and 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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Amount before allowance of commercial loans, including, but not limited to, letters of credit, bankers' acceptances, receivables factoring, open account financing, for international trade activities. 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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