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Loans and Lease Finance Receivables and Allowance for Loan Losses - Schedule of Balance and Activity Related to Allowance for Loan Losses for Held-for-Investment Loans by Type (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	$ 61,540	$ 59,156	$ 59,825
Charge-offs	(151)	(238)	(1,009)
Recoveries	6,696	9,022	5,940
(Recapture of) provision for loan losses	(8,500)	(6,400)	(5,600)
Ending Balance	59,585	61,540	59,156
PCI Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	1,219	0
Charge-offs	0	0
Recoveries	0	0
(Recapture of) provision for loan losses	(852)	1,219
Ending Balance	367	1,219	0
Commercial and Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	8,154	8,588	7,074
Charge-offs	(138)	(120)	(411)
Recoveries	118	630	319
(Recapture of) provision for loan losses	(854)	(944)	1,606
Ending Balance	7,280	8,154	8,588
Small Business Administration [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	871	993	2,557
Charge-offs	0	0	(37)
Recoveries	78	40	41
(Recapture of) provision for loan losses	(80)	(162)	(1,568)
Ending Balance	869	871	993
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	37,443	36,995	33,373
Charge-offs	0	0	(117)
Recoveries	154	792	4,330
(Recapture of) provision for loan losses	4,125	(344)	(591)
Ending Balance	41,722	37,443	36,995
Construction [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	1,096	2,389	988
Charge-offs	0	0	0
Recoveries	6,036	7,174	581
(Recapture of) provision for loan losses	(6,148)	(8,467)	820
Ending Balance	984	1,096	2,389
SFR Mortgage [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	2,287	2,103	2,344
Charge-offs	0	(102)	(215)
Recoveries	212	0	186
(Recapture of) provision for loan losses	(387)	286	(212)
Ending Balance	2,112	2,287	2,103
Dairy & Livestock and Agribusiness [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	8,541	6,029	5,479
Charge-offs	0	0	0
Recoveries	19	216	407
(Recapture of) provision for loan losses	(3,913)	2,296	143
Ending Balance	4,647	8,541	6,029
Municipal Lease Finance Receivables [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	941	1,153	1,412
Charge-offs	0	0	0
Recoveries	0	0	0
(Recapture of) provision for loan losses	(90)	(212)	(259)
Ending Balance	851	941	1,153
Consumer and Other Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	988	906	1,262
Charge-offs	(13)	(16)	(229)
Recoveries	79	170	76
(Recapture of) provision for loan losses	(301)	(72)	(203)
Ending Balance	$ 753	988	906
Unallocated [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance		$ 0	5,336
Charge-offs			0
Recoveries			0
(Recapture of) provision for loan losses			(5,336)
Ending Balance			$ 0

X

- Definition

Amount of recovery of loans and lease receivables which had previously been fully or partially written-off as bad debts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (c)(4)
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Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss.

+ References

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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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