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Non-Covered Loans and Lease Finance Receivables and Allowance for Loan Losses - Schedule of Balance and Activity Related to Allowance for Loan Losses for Non-Covered Held for Investment Loans by Portfolio Segment (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended							12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance								$ 92,441
Provision for loan losses	(6,800)	(3,750)	(6,200)					(16,750)		7,068
Ending Balance	75,235			92,441				75,235	92,441
Non-Covered Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance							93,964	92,441	93,964	105,259
Charge-offs								(2,851)	(5,207)	(19,628)
Recoveries								2,395	3,027	2,158
Provision for loan losses								(16,750)	657	6,175
Ending Balance	75,235			92,441				75,235	92,441	93,964
Non-Covered Loans [Member] \| Commercial and Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance							10,654	11,652	10,654	11,472
Charge-offs								(2,491)	(1,259)	(1,980)
Recoveries								759	1,280	302
Provision for loan losses								914	977	860
Ending Balance	10,834			11,652				10,834	11,652	10,654
Non-Covered Loans [Member] \| Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance							47,841	47,457	47,841	40,234
Charge-offs									(1,873)	(4,766)
Recoveries								402	514	606
Provision for loan losses								(8,457)	975	11,767
Ending Balance	39,402			47,457				39,402	47,457	47,841
Non-Covered Loans [Member] \| Construction [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance							4,947	2,291	4,947	10,188
Charge-offs										(7,976)
Recoveries								703	1,139	757
Provision for loan losses								(1,689)	(3,795)	1,978
Ending Balance	1,305			2,291				1,305	2,291	4,947
Non-Covered Loans [Member] \| SFR Mortgage [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance							4,032	3,448	4,032	3,295
Charge-offs								(252)	(642)	(1,104)
Recoveries								367	(108)	142
Provision for loan losses								(845)	166	1,699
Ending Balance	2,718			3,448				2,718	3,448	4,032
Non-Covered Loans [Member] \| Dairy & Livestock and Agribusiness [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance							17,278	18,696	17,278	36,061
Charge-offs									(1,150)	(3,291)
Recoveries								109	166	151
Provision for loan losses								(7,077)	2,402	(15,643)
Ending Balance	11,728			18,696				11,728	18,696	17,278
Non-Covered Loans [Member] \| Municipal Lease Finance Receivables [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance							2,403	1,588	2,403	2,172
Charge-offs
Recoveries
Provision for loan losses								747	(815)	231
Ending Balance	2,335			1,588				2,335	1,588	2,403
Non-Covered Loans [Member] \| Consumer and Other Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance							1,590	1,170	1,590	1,034
Charge-offs								(108)	(283)	(511)
Recoveries								55	36	200
Provision for loan losses								(157)	(173)	867
Ending Balance	960			1,170				960	1,170	1,590
Non-Covered Loans [Member] \| Unallocated [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance							5,219	6,139	5,219	803
Charge-offs
Recoveries
Provision for loan losses								(186)	920	4,416
Ending Balance	$ 5,953			$ 6,139				$ 5,953	$ 6,139	$ 5,219