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Loans and Lease Finance Receivables and Allowance for Loan Losses - Schedule of Recorded Investment in Loans Held-for-Investment and Related Allowance for Loan Losses by Loan Type (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment in Loans, Individually Evaluated for Impairment	$ 14,712		$ 28,796
Recorded Investment in Loans, Collectively Evaluated for Impairment	4,788,193		4,616,131
Recorded Investment in Loans, Acquired with Deterioriated Credit Quality	19,426		49,869
Allowance for Loan Losses, Individually Evaluated for Impairment	16		113
Allowance for Loan Losses, Collectively Evaluated for Impairment	59,351		59,429
Allowance for Loan Losses, Acquired with Deterioriated Credit Quality	216		659
PCI Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment in Loans, Individually Evaluated for Impairment	0		0
Recorded Investment in Loans, Collectively Evaluated for Impairment	0		0
Recorded Investment in Loans, Acquired with Deterioriated Credit Quality	19,426	$ 28,882	49,869
Allowance for Loan Losses, Individually Evaluated for Impairment	0		0
Allowance for Loan Losses, Collectively Evaluated for Impairment	0		0
Allowance for Loan Losses, Acquired with Deterioriated Credit Quality	216	$ 367	659
Commercial and Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment in Loans, Individually Evaluated for Impairment	355		1,605
Recorded Investment in Loans, Collectively Evaluated for Impairment	508,833		535,742
Recorded Investment in Loans, Acquired with Deterioriated Credit Quality	0		0
Allowance for Loan Losses, Individually Evaluated for Impairment	0		13
Allowance for Loan Losses, Collectively Evaluated for Impairment	6,970		8,047
Allowance for Loan Losses, Acquired with Deterioriated Credit Quality	0		0
Small Business Administration [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment in Loans, Individually Evaluated for Impairment	1,174		2,478
Recorded Investment in Loans, Collectively Evaluated for Impairment	119,874		126,805
Recorded Investment in Loans, Acquired with Deterioriated Credit Quality	0		0
Allowance for Loan Losses, Individually Evaluated for Impairment	0		6
Allowance for Loan Losses, Collectively Evaluated for Impairment	841		907
Allowance for Loan Losses, Acquired with Deterioriated Credit Quality	0		0
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment in Loans, Individually Evaluated for Impairment	7,741		18,558
Recorded Investment in Loans, Collectively Evaluated for Impairment	3,446,289		3,247,300
Recorded Investment in Loans, Acquired with Deterioriated Credit Quality	0		0
Allowance for Loan Losses, Individually Evaluated for Impairment	0		0
Allowance for Loan Losses, Collectively Evaluated for Impairment	42,597		39,927
Allowance for Loan Losses, Acquired with Deterioriated Credit Quality	0		0
Construction [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment in Loans, Individually Evaluated for Impairment	0		0
Recorded Investment in Loans, Collectively Evaluated for Impairment	84,400		77,294
Recorded Investment in Loans, Acquired with Deterioriated Credit Quality	0		0
Allowance for Loan Losses, Individually Evaluated for Impairment	0		0
Allowance for Loan Losses, Collectively Evaluated for Impairment	1,003		1,059
Allowance for Loan Losses, Acquired with Deterioriated Credit Quality	0		0
SFR Mortgage [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment in Loans, Individually Evaluated for Impairment	4,133		4,195
Recorded Investment in Loans, Collectively Evaluated for Impairment	233,021		245,738
Recorded Investment in Loans, Acquired with Deterioriated Credit Quality	0		0
Allowance for Loan Losses, Individually Evaluated for Impairment	13		0
Allowance for Loan Losses, Collectively Evaluated for Impairment	2,142		2,369
Allowance for Loan Losses, Acquired with Deterioriated Credit Quality	0		0
Dairy & Livestock and Agribusiness [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment in Loans, Individually Evaluated for Impairment	800		829
Recorded Investment in Loans, Collectively Evaluated for Impairment	267,689		244,426
Recorded Investment in Loans, Acquired with Deterioriated Credit Quality	0		0
Allowance for Loan Losses, Individually Evaluated for Impairment	0		0
Allowance for Loan Losses, Collectively Evaluated for Impairment	4,351		5,440
Allowance for Loan Losses, Acquired with Deterioriated Credit Quality	0		0
Municipal Lease Finance Receivables [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment in Loans, Individually Evaluated for Impairment	0		0
Recorded Investment in Loans, Collectively Evaluated for Impairment	67,721		66,048
Recorded Investment in Loans, Acquired with Deterioriated Credit Quality	0		0
Allowance for Loan Losses, Individually Evaluated for Impairment	0		0
Allowance for Loan Losses, Collectively Evaluated for Impairment	808		852
Allowance for Loan Losses, Acquired with Deterioriated Credit Quality	0		0
Consumer and Other Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment in Loans, Individually Evaluated for Impairment	509		1,131
Recorded Investment in Loans, Collectively Evaluated for Impairment	60,366		72,778
Recorded Investment in Loans, Acquired with Deterioriated Credit Quality	0		0
Allowance for Loan Losses, Individually Evaluated for Impairment	3		94
Allowance for Loan Losses, Collectively Evaluated for Impairment	639		828
Allowance for Loan Losses, Acquired with Deterioriated Credit Quality	$ 0		$ 0

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Gross purchased credit impaired loans net of discount.

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-Publisher FASB
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-SubTopic 10
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