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, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans, excluding PCI loans, net of deferred loan fees	$ 7,764,611	$ 4,830,631
Less: Allowance for loan losses	(63,613)	(59,585)	$ (61,540)	$ (59,156)
Total loans and lease finance receivables	7,700,998	4,771,046
PCI Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and industrial	519	934
PCI Loans	17,214	30,908
SBA	1,258	1,383
Discount on PCI loans	0	(2,026)
Commercial real estate	14,407	27,431
Construction	0	0
SFR mortgage	145	162
Dairy & livestock and agribusiness	700	770
Municipal lease finance receivables	0	0
Consumer and other loans	185	228
Less: Allowance for loan losses	(204)	(367)	$ (1,219)	$ 0
Net loans	17,010	28,515
Loans, Excluding PCI Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and industrial	1,002,209	513,325
SBA	350,043	122,055
Commercial real estate	5,394,229	3,376,713
Construction	122,782	77,982
SFR mortgage	296,504	236,202
Dairy & livestock and agribusiness	393,843	347,289
Municipal lease finance receivables	64,186	70,243
Consumer and other loans	128,429	64,229
Total gross loans, excluding PCI loans	7,752,225	4,808,038
Less: Deferred loan fees, net	(4,828)	(6,289)
Gross loans, excluding PCI loans, net of deferred loan fees	7,747,397	4,801,749
Less: Allowance for loan losses	(63,409)	(59,218)
Net loans	$ 7,683,988	$ 4,742,531

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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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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