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Loans Receivable and Allowance for Loan Losses - Allowance for Credit Losses on Financing Receivables (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2016	Dec. 31, 2015
Allowance for Loan Losses by Portfolio Segment
Balance, beginning of period	$ 76,408	$ 67,758
Provision (credit) for loan losses	500	1,500
Loans charged off	(821)	(1,125)
Recoveries of charged offs	769	1,461
Balance, end of period	76,856	69,594
Allowance for loan losses:
Allowance for loan losses - Individually evaluated for impairment			$ 9,884	$ 8,807
Allowance for loan losses - Collectively evaluated for impairment			55,095	55,619
Allowance for loan losses - Total	76,408	67,758	76,856	76,408
Loans outstsanding:
Loans outstanding - Individually evaluated for impairment			140,424	138,090
Loans outstanding - Collectively evaluated for impairment			6,129,918	6,004,472
Loans outstanding - ACILs			6,295,079	6,171,933
Total loans outstanding			6,375,001	6,251,371
Legacy
Loans outstsanding:
Total loans outstanding			6,048,342	5,877,614
Acquired
Loans outstsanding:
Total loans outstanding			326,659	373,757
Real estate
Loans outstsanding:
Total loans outstanding			5,132,517	5,069,482
Real estate | Legacy
Allowance for Loan Losses by Portfolio Segment
Balance, beginning of period	42,829	38,775
Provision (credit) for loan losses	(1,218)	(3,621)
Loans charged off	(19)	(182)
Recoveries of charged offs	523	800
Balance, end of period	42,115	35,772
Allowance for loan losses:
Allowance for loan losses - Individually evaluated for impairment			1,760	1,663
Allowance for loan losses - Collectively evaluated for impairment			40,355	41,166
Allowance for loan losses - Total	42,829	38,775	42,115	42,829
Loans outstsanding:
Loans outstanding - Individually evaluated for impairment			65,354	63,376
Loans outstanding - Collectively evaluated for impairment			4,815,539	4,717,300
Total loans outstanding			4,880,893	4,780,676
Real estate | Acquired
Allowance for Loan Losses by Portfolio Segment
Balance, beginning of period	12,823	8,573
Provision (credit) for loan losses	(82)	5,310
Loans charged off	(116)	(159)
Recoveries of charged offs	1	0
Balance, end of period	12,626	13,724
Allowance for loan losses:
Allowance for loan losses - Individually evaluated for impairment			208	225
Allowance for loan losses - Collectively evaluated for impairment			541	616
Allowance for loan losses - Total	12,823	8,573	12,626	12,823
Loans outstsanding:
Loans outstanding - Individually evaluated for impairment			17,952	19,109
Loans outstanding - Collectively evaluated for impairment			166,190	200,753
Total loans outstanding			251,624	288,806
Commercial business
Allowance for Loan Losses by Portfolio Segment
Balance, beginning of period	16,547
Balance, end of period	19,202
Allowance for loan losses:
Allowance for loan losses - Total	16,547		19,202	16,547
Loans outstsanding:
Total loans outstanding			1,032,078	980,153
Commercial business | Legacy
Allowance for Loan Losses by Portfolio Segment
Balance, beginning of period	16,332	15,986
Provision (credit) for loan losses	3,147	(22)
Loans charged off	(621)	(451)
Recoveries of charged offs	190	655
Balance, end of period	19,048	16,168
Allowance for loan losses:
Allowance for loan losses - Individually evaluated for impairment			6,513	4,188
Allowance for loan losses - Collectively evaluated for impairment			12,535	12,144
Allowance for loan losses - Total	16,332	15,986	19,048	16,332
Loans outstsanding:
Loans outstanding - Individually evaluated for impairment			46,534	40,352
Loans outstanding - Collectively evaluated for impairment			949,346	896,041
Total loans outstanding			995,880	936,393
Commercial business | Acquired
Allowance for Loan Losses by Portfolio Segment
Balance, beginning of period	214	485
Provision (credit) for loan losses	(112)	23
Loans charged off	0	(87)
Recoveries of charged offs	52	1
Balance, end of period	154	422
Allowance for loan losses:
Allowance for loan losses - Individually evaluated for impairment			96	128
Allowance for loan losses - Collectively evaluated for impairment			58	86
Allowance for loan losses - Total	214	485	154	214
Loans outstsanding:
Loans outstanding - Individually evaluated for impairment			1,262	1,235
Loans outstanding - Collectively evaluated for impairment			16,328	22,660
Total loans outstanding			36,198	43,760
Trade finance
Allowance for Loan Losses by Portfolio Segment
Balance, beginning of period	3,592
Balance, end of period	2,085
Allowance for loan losses:
Allowance for loan losses - Total	3,592		2,085	3,592
Loans outstsanding:
Total loans outstanding			86,342	99,163
Trade finance | Legacy
Allowance for Loan Losses by Portfolio Segment
Balance, beginning of period	3,592	3,456
Provision (credit) for loan losses	(1,507)	(186)
Loans charged off	0	(229)
Recoveries of charged offs	0	0
Balance, end of period	2,085	3,041
Allowance for loan losses:
Allowance for loan losses - Individually evaluated for impairment			1,307	2,603
Allowance for loan losses - Collectively evaluated for impairment			778	989
Allowance for loan losses - Total	3,592	3,456	2,085	3,592
Loans outstsanding:
Loans outstanding - Individually evaluated for impairment			8,081	12,548
Loans outstanding - Collectively evaluated for impairment			78,261	86,615
Total loans outstanding			86,342	99,163
Trade finance | Acquired
Allowance for Loan Losses by Portfolio Segment
Balance, beginning of period	0	0
Provision (credit) for loan losses	0	0
Loans charged off	0	0
Recoveries of charged offs	0	0
Balance, end of period	0	0
Allowance for loan losses:
Allowance for loan losses - Individually evaluated for impairment			0	0
Allowance for loan losses - Collectively evaluated for impairment			0	0
Allowance for loan losses - Total	0	0	0	0
Loans outstsanding:
Loans outstanding - Individually evaluated for impairment			0	0
Loans outstanding - Collectively evaluated for impairment			0	0
Total loans outstanding			0	0
Consumer and other
Allowance for Loan Losses by Portfolio Segment
Balance, beginning of period	617
Balance, end of period	828
Allowance for loan losses:
Allowance for loan losses - Total	617		828	617
Loans outstsanding:
Total loans outstanding			124,064	102,573
Consumer and other | Legacy
Allowance for Loan Losses by Portfolio Segment
Balance, beginning of period	556	427
Provision (credit) for loan losses	276	(1)
Loans charged off	(65)	(13)
Recoveries of charged offs	1	3
Balance, end of period	768	416
Allowance for loan losses:
Allowance for loan losses - Individually evaluated for impairment			0	0
Allowance for loan losses - Collectively evaluated for impairment			768	556
Allowance for loan losses - Total	556	427	768	556
Loans outstsanding:
Loans outstanding - Individually evaluated for impairment			786	812
Loans outstanding - Collectively evaluated for impairment			84,441	60,570
Total loans outstanding			85,227	61,382
Consumer and other | Acquired
Allowance for Loan Losses by Portfolio Segment
Balance, beginning of period	62	56
Provision (credit) for loan losses	(4)	(3)
Loans charged off	0	(4)
Recoveries of charged offs	2	2
Balance, end of period	60	51
Allowance for loan losses:
Allowance for loan losses - Individually evaluated for impairment			0	0
Allowance for loan losses - Collectively evaluated for impairment			60	62
Allowance for loan losses - Total	62	$ 56	60	62
Loans outstsanding:
Loans outstanding - Individually evaluated for impairment			455	658
Loans outstanding - Collectively evaluated for impairment			19,813	20,533
Total loans outstanding			38,837	41,191
Receivables acquired with deteriorated credit quality
Allowance for Loan Losses by Portfolio Segment
Balance, beginning of period	11,982
Balance, end of period	11,877
Allowance for loan losses:
Allowance for loan losses - Total	11,982		11,877	11,982
Loans outstsanding:
Loans outstanding - ACILs			104,659	108,809
Receivables acquired with deteriorated credit quality | Real estate | Legacy
Allowance for Loan Losses by Portfolio Segment
Balance, beginning of period	0
Balance, end of period	0
Allowance for loan losses:
Allowance for loan losses - Total	0		0	0
Loans outstsanding:
Loans outstanding - ACILs			0	0
Receivables acquired with deteriorated credit quality | Real estate | Acquired
Allowance for Loan Losses by Portfolio Segment
Balance, beginning of period	11,982
Balance, end of period	11,877
Allowance for loan losses:
Allowance for loan losses - Total	11,982		11,877	11,982
Loans outstsanding:
Loans outstanding - ACILs			67,482	68,944
Receivables acquired with deteriorated credit quality | Commercial business | Legacy
Allowance for Loan Losses by Portfolio Segment
Balance, beginning of period	0
Balance, end of period	0
Allowance for loan losses:
Allowance for loan losses - Total	0		0	0
Loans outstsanding:
Loans outstanding - ACILs			0	0
Receivables acquired with deteriorated credit quality | Commercial business | Acquired
Allowance for Loan Losses by Portfolio Segment
Balance, beginning of period	0
Balance, end of period	0
Allowance for loan losses:
Allowance for loan losses - Total	0		0	0
Loans outstsanding:
Loans outstanding - ACILs			18,608	19,865
Receivables acquired with deteriorated credit quality | Trade finance | Legacy
Allowance for Loan Losses by Portfolio Segment
Balance, beginning of period	0
Balance, end of period	0
Allowance for loan losses:
Allowance for loan losses - Total	0		0	0
Loans outstsanding:
Loans outstanding - ACILs			0	0
Receivables acquired with deteriorated credit quality | Trade finance | Acquired
Allowance for Loan Losses by Portfolio Segment
Balance, beginning of period	0
Balance, end of period	0
Allowance for loan losses:
Allowance for loan losses - Total	0		0	0
Loans outstsanding:
Loans outstanding - ACILs			0	0
Receivables acquired with deteriorated credit quality | Consumer and other | Legacy
Allowance for Loan Losses by Portfolio Segment
Balance, beginning of period	0
Balance, end of period	0
Allowance for loan losses:
Allowance for loan losses - Total	0		0	0
Loans outstsanding:
Loans outstanding - ACILs			0	0
Receivables acquired with deteriorated credit quality | Consumer and other | Acquired
Allowance for Loan Losses by Portfolio Segment
Balance, beginning of period	0
Balance, end of period	0
Allowance for loan losses:
Allowance for loan losses - Total	$ 0		0	0
Loans outstsanding:
Loans outstanding - ACILs			$ 18,569	$ 20,000

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The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment.

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Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment.

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Amount of recovery of financing receivables doubtful of collection that were previously charged off.

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Amount of direct write-downs of financing receivables charged against the allowance.

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The balance of financing receivables that were collectively evaluated for impairment.

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Amount of expense related loan transactions, lease transactions, credit loss from transactions other than loan and lease transactions, and other loss based on assessment of uncollectability from the counterparty to reduce the account to their net realizable value.

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