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Loans Receivable and Allowance for Loan Losses - Impaired Financing Receivables (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2017		Mar. 31, 2016	Dec. 31, 2016
Impaired Loans, Recorded Investment
Recorded Investment, With related allowance	[1]	$ 52,140			$ 60,758
Recorded Investment, With no related allowance	[1]	77,439			79,603
Related Allowance		(5,079)			(7,409)
Impaired Loans, net of allowance		124,500			132,952
Total recorded investment	[1]	129,579			140,361
Impaired Loans, Unpaid Principal Balance
Unpaid Contractual Principal Balance, With related allowance		54,434			62,494
Unpaid Contractual Principal Balance, With no related allowance		93,021			91,065
Impaired Financing Receivable, Unpaid Principal Balance		147,455			153,559
Impaired Loans, Average Recorded Investment
Average Recorded Investment, With related allowance	[1]	56,450		$ 79,142
Average Recorded Investment, With no related allowance	[1]	78,522		60,116
Average Recorded Investment, Total	[1]	134,972		139,258
Impaired Loans, Interest Income Recognized during Impairment
Interest Income Recognized during Impairment, With related allowance		530		700
Interest Income Recognized during Impairment, With no related allowance		580		391
Interest Income Recognized during Impairment, Total		$ 1,110		1,091
Threshold period for loans to be placed on nonaccrual status		90 days
WIthout charge-offs
Impaired Loans, Recorded Investment
Recorded Investment, With related allowance		$ 51,944			59,638
Recorded Investment, With no related allowance		70,466			76,775
With charge-offs
Impaired Loans, Recorded Investment
Recorded Investment, With related allowance		196			1,120
Recorded Investment, With no related allowance		6,973			2,828
Acquired
Impaired Loans, Recorded Investment
Recorded Investment, With related allowance		1,760			2,593
Recorded Investment, With no related allowance		18,856			22,138
Related Allowance		(152)			(186)
Total recorded investment		20,616			24,731
Impaired Loans, Unpaid Principal Balance
Unpaid Contractual Principal Balance, With related allowance		3,666			2,930
Unpaid Contractual Principal Balance, With no related allowance		23,009			26,118
Impaired Financing Receivable, Unpaid Principal Balance		26,675			29,048
Impaired Loans, Average Recorded Investment
Average Recorded Investment, With related allowance		2,176		3,052
Average Recorded Investment, With no related allowance		20,497		17,284
Average Recorded Investment, Total		22,673		20,336
Impaired Loans, Interest Income Recognized during Impairment
Interest Income Recognized during Impairment, With related allowance		15		9
Interest Income Recognized during Impairment, With no related allowance		125		97
Interest Income Recognized during Impairment, Total		140		106
Real estate | Residential
Impaired Loans, Recorded Investment
Recorded Investment, With related allowance		0	[1]		0
Recorded Investment, With no related allowance		1,465	[1]		3,562
Related Allowance		0			0
Impaired Loans, Unpaid Principal Balance
Unpaid Contractual Principal Balance, With related allowance		0			0
Unpaid Contractual Principal Balance, With no related allowance		1,465			3,562
Impaired Loans, Average Recorded Investment
Average Recorded Investment, With related allowance	[1]	0		0
Average Recorded Investment, With no related allowance	[1]	2,513		0
Impaired Loans, Interest Income Recognized during Impairment
Interest Income Recognized during Impairment, With related allowance		0		0
Interest Income Recognized during Impairment, With no related allowance		28		0
Real estate | Residential | Acquired
Impaired Loans, Recorded Investment
Recorded Investment, With related allowance		0			0
Recorded Investment, With no related allowance		0			679
Related Allowance		0			0
Impaired Loans, Unpaid Principal Balance
Unpaid Contractual Principal Balance, With related allowance		0			0
Unpaid Contractual Principal Balance, With no related allowance		0			679
Impaired Loans, Average Recorded Investment
Average Recorded Investment, With related allowance		0		0
Average Recorded Investment, With no related allowance		339		0
Impaired Loans, Interest Income Recognized during Impairment
Interest Income Recognized during Impairment, With related allowance		0		0
Interest Income Recognized during Impairment, With no related allowance		0		0
Real estate | Commercial & industrial
Impaired Loans, Recorded Investment
Related Allowance		(2,560)			(2,002)
Real estate | Commercial & industrial | Retail
Impaired Loans, Recorded Investment
Recorded Investment, With related allowance		581	[1]		2,095
Recorded Investment, With no related allowance		16,752	[1]		12,753
Related Allowance		(9)			(90)
Impaired Loans, Unpaid Principal Balance
Unpaid Contractual Principal Balance, With related allowance		581			2,384
Unpaid Contractual Principal Balance, With no related allowance		17,724			13,290
Impaired Loans, Average Recorded Investment
Average Recorded Investment, With related allowance	[1]	1,338		1,712
Average Recorded Investment, With no related allowance	[1]	14,752		11,105
Impaired Loans, Interest Income Recognized during Impairment
Interest Income Recognized during Impairment, With related allowance		4		0
Interest Income Recognized during Impairment, With no related allowance		159		100
Real estate | Commercial & industrial | Retail | Acquired
Impaired Loans, Recorded Investment
Recorded Investment, With related allowance		311			1,826
Recorded Investment, With no related allowance		4,351			3,148
Related Allowance		0			(85)
Impaired Loans, Unpaid Principal Balance
Unpaid Contractual Principal Balance, With related allowance		311			2,114
Unpaid Contractual Principal Balance, With no related allowance		4,831			3,214
Impaired Loans, Average Recorded Investment
Average Recorded Investment, With related allowance		1,068		1,169
Average Recorded Investment, With no related allowance		3,750		2,571
Impaired Loans, Interest Income Recognized during Impairment
Interest Income Recognized during Impairment, With related allowance		4		0
Interest Income Recognized during Impairment, With no related allowance		31		26
Real estate | Commercial & industrial | Hotel & motel
Impaired Loans, Recorded Investment
Recorded Investment, With related allowance		6,395	[1]		6,387
Recorded Investment, With no related allowance		6,273	[1]		6,122
Related Allowance		(403)			(337)
Impaired Loans, Unpaid Principal Balance
Unpaid Contractual Principal Balance, With related allowance		6,433			6,387
Unpaid Contractual Principal Balance, With no related allowance		12,221			11,735
Impaired Loans, Average Recorded Investment
Average Recorded Investment, With related allowance	[1]	6,391		4,611
Average Recorded Investment, With no related allowance	[1]	6,198		7,849
Impaired Loans, Interest Income Recognized during Impairment
Interest Income Recognized during Impairment, With related allowance		43		57
Interest Income Recognized during Impairment, With no related allowance		7		22
Real estate | Commercial & industrial | Hotel & motel | Acquired
Impaired Loans, Recorded Investment
Recorded Investment, With related allowance		92			0
Recorded Investment, With no related allowance		4,840			4,767
Related Allowance		(2)			0
Impaired Loans, Unpaid Principal Balance
Unpaid Contractual Principal Balance, With related allowance		89			0
Unpaid Contractual Principal Balance, With no related allowance		7,352			7,171
Impaired Loans, Average Recorded Investment
Average Recorded Investment, With related allowance		46		0
Average Recorded Investment, With no related allowance		4,803		6,882
Impaired Loans, Interest Income Recognized during Impairment
Interest Income Recognized during Impairment, With related allowance		0		0
Interest Income Recognized during Impairment, With no related allowance		4		17
Real estate | Commercial & industrial | Gas station & car wash
Impaired Loans, Recorded Investment
Recorded Investment, With related allowance		0	[1]		215
Recorded Investment, With no related allowance		4,160	[1]		5,043
Related Allowance		0			(41)
Impaired Loans, Unpaid Principal Balance
Unpaid Contractual Principal Balance, With related allowance		0			228
Unpaid Contractual Principal Balance, With no related allowance		6,634			7,449
Impaired Loans, Average Recorded Investment
Average Recorded Investment, With related allowance	[1]	108		1,050
Average Recorded Investment, With no related allowance	[1]	4,602		4,665
Impaired Loans, Interest Income Recognized during Impairment
Interest Income Recognized during Impairment, With related allowance		0		0
Interest Income Recognized during Impairment, With no related allowance		10		34
Real estate | Commercial & industrial | Gas station & car wash | Acquired
Impaired Loans, Recorded Investment
Recorded Investment, With related allowance		0			0
Recorded Investment, With no related allowance		618			1,568
Related Allowance		0			0
Impaired Loans, Unpaid Principal Balance
Unpaid Contractual Principal Balance, With related allowance		0			0
Unpaid Contractual Principal Balance, With no related allowance		804			1,815
Impaired Loans, Average Recorded Investment
Average Recorded Investment, With related allowance		0		509
Average Recorded Investment, With no related allowance		1,093		1,392
Impaired Loans, Interest Income Recognized during Impairment
Interest Income Recognized during Impairment, With related allowance		0		0
Interest Income Recognized during Impairment, With no related allowance		10		25
Real estate | Commercial & industrial | Mixed use
Impaired Loans, Recorded Investment
Recorded Investment, With related allowance		250	[1]		206
Recorded Investment, With no related allowance		6,530	[1]		7,303
Related Allowance		(3)			(27)
Impaired Loans, Unpaid Principal Balance
Unpaid Contractual Principal Balance, With related allowance		2,101			732
Unpaid Contractual Principal Balance, With no related allowance		7,614			7,822
Impaired Loans, Average Recorded Investment
Average Recorded Investment, With related allowance	[1]	228		563
Average Recorded Investment, With no related allowance	[1]	6,916		2,364
Impaired Loans, Interest Income Recognized during Impairment
Interest Income Recognized during Impairment, With related allowance		2		2
Interest Income Recognized during Impairment, With no related allowance		63		12
Real estate | Commercial & industrial | Mixed use | Acquired
Impaired Loans, Recorded Investment
Recorded Investment, With related allowance		250			136
Recorded Investment, With no related allowance		5,283			5,315
Related Allowance		(3)			(2)
Impaired Loans, Unpaid Principal Balance
Unpaid Contractual Principal Balance, With related allowance		2,101			136
Unpaid Contractual Principal Balance, With no related allowance		5,510			5,551
Impaired Loans, Average Recorded Investment
Average Recorded Investment, With related allowance		193		493
Average Recorded Investment, With no related allowance		5,299		273
Impaired Loans, Interest Income Recognized during Impairment
Interest Income Recognized during Impairment, With related allowance		2		2
Interest Income Recognized during Impairment, With no related allowance		63		3
Real estate | Commercial & industrial | Industrial & warehouse
Impaired Loans, Recorded Investment
Recorded Investment, With related allowance		2,882	[1]		530
Recorded Investment, With no related allowance		8,498	[1]		9,673
Related Allowance		(2)			0
Impaired Loans, Unpaid Principal Balance
Unpaid Contractual Principal Balance, With related allowance		2,882			530
Unpaid Contractual Principal Balance, With no related allowance		8,574			9,748
Impaired Loans, Average Recorded Investment
Average Recorded Investment, With related allowance	[1]	1,706		560
Average Recorded Investment, With no related allowance	[1]	9,086		9,888
Impaired Loans, Interest Income Recognized during Impairment
Interest Income Recognized during Impairment, With related allowance		32		6
Interest Income Recognized during Impairment, With no related allowance		75		85
Real estate | Commercial & industrial | Industrial & warehouse | Acquired
Impaired Loans, Recorded Investment
Recorded Investment, With related allowance		0			0
Recorded Investment, With no related allowance		65			66
Related Allowance		0			0
Impaired Loans, Unpaid Principal Balance
Unpaid Contractual Principal Balance, With related allowance		0			0
Unpaid Contractual Principal Balance, With no related allowance		65			66
Impaired Loans, Average Recorded Investment
Average Recorded Investment, With related allowance		0		0
Average Recorded Investment, With no related allowance		66		1,111
Impaired Loans, Interest Income Recognized during Impairment
Interest Income Recognized during Impairment, With related allowance		0		0
Interest Income Recognized during Impairment, With no related allowance		1		2
Real estate | Commercial & industrial | Other
Impaired Loans, Recorded Investment
Recorded Investment, With related allowance		22,412	[1]		22,580
Recorded Investment, With no related allowance		15,648	[1]		20,181
Related Allowance		(2,143)			(1,507)
Impaired Loans, Unpaid Principal Balance
Unpaid Contractual Principal Balance, With related allowance		22,657			22,825
Unpaid Contractual Principal Balance, With no related allowance		16,911			21,492
Impaired Loans, Average Recorded Investment
Average Recorded Investment, With related allowance	[1]	22,496		24,462
Average Recorded Investment, With no related allowance	[1]	17,915		12,712
Impaired Loans, Interest Income Recognized during Impairment
Interest Income Recognized during Impairment, With related allowance		253		275
Interest Income Recognized during Impairment, With no related allowance		130		90
Real estate | Commercial & industrial | Other | Acquired
Impaired Loans, Recorded Investment
Recorded Investment, With related allowance		333			337
Recorded Investment, With no related allowance		3,182			6,023
Related Allowance		(25)			(26)
Impaired Loans, Unpaid Principal Balance
Unpaid Contractual Principal Balance, With related allowance		337			341
Unpaid Contractual Principal Balance, With no related allowance		3,853			6,752
Impaired Loans, Average Recorded Investment
Average Recorded Investment, With related allowance		335		305
Average Recorded Investment, With no related allowance		4,603		3,826
Impaired Loans, Interest Income Recognized during Impairment
Interest Income Recognized during Impairment, With related allowance		4		4
Interest Income Recognized during Impairment, With no related allowance		13		14
Real estate | Construction
Impaired Loans, Recorded Investment
Recorded Investment, With related allowance		0	[1]		0
Recorded Investment, With no related allowance		2,856	[1]		1,300
Related Allowance		0			0
Impaired Loans, Unpaid Principal Balance
Unpaid Contractual Principal Balance, With related allowance		0			0
Unpaid Contractual Principal Balance, With no related allowance		2,996			1,441
Impaired Loans, Average Recorded Investment
Average Recorded Investment, With related allowance	[1]	0		0
Average Recorded Investment, With no related allowance	[1]	2,078		1,355
Impaired Loans, Interest Income Recognized during Impairment
Interest Income Recognized during Impairment, With related allowance		0		0
Interest Income Recognized during Impairment, With no related allowance		20		0
Real estate | Construction | Acquired
Impaired Loans, Recorded Investment
Recorded Investment, With related allowance		0			0
Recorded Investment, With no related allowance		0			0
Related Allowance		0			0
Impaired Loans, Unpaid Principal Balance
Unpaid Contractual Principal Balance, With related allowance		0			0
Unpaid Contractual Principal Balance, With no related allowance		0			0
Impaired Loans, Average Recorded Investment
Average Recorded Investment, With related allowance		0		0
Average Recorded Investment, With no related allowance		0		0
Impaired Loans, Interest Income Recognized during Impairment
Interest Income Recognized during Impairment, With related allowance		0		0
Interest Income Recognized during Impairment, With no related allowance		0		0
Commercial business
Impaired Loans, Recorded Investment
Recorded Investment, With related allowance		19,538	[1]		26,543
Recorded Investment, With no related allowance		9,902	[1]		8,675
Related Allowance		(2,479)			(4,493)
Impaired Loans, Unpaid Principal Balance
Unpaid Contractual Principal Balance, With related allowance		19,698			27,161
Unpaid Contractual Principal Balance, With no related allowance		13,509			9,472
Impaired Loans, Average Recorded Investment
Average Recorded Investment, With related allowance	[1]	23,041		35,742
Average Recorded Investment, With no related allowance	[1]	9,289		8,950
Impaired Loans, Interest Income Recognized during Impairment
Interest Income Recognized during Impairment, With related allowance		195		265
Interest Income Recognized during Impairment, With no related allowance		30		41
Commercial business | Acquired
Impaired Loans, Recorded Investment
Recorded Investment, With related allowance		774			294
Recorded Investment, With no related allowance		245			141
Related Allowance		(122)			(73)
Impaired Loans, Unpaid Principal Balance
Unpaid Contractual Principal Balance, With related allowance		828			339
Unpaid Contractual Principal Balance, With no related allowance		313			386
Impaired Loans, Average Recorded Investment
Average Recorded Investment, With related allowance		534		576
Average Recorded Investment, With no related allowance		193		672
Impaired Loans, Interest Income Recognized during Impairment
Interest Income Recognized during Impairment, With related allowance		5		3
Interest Income Recognized during Impairment, With no related allowance		1		8
Trade finance
Impaired Loans, Recorded Investment
Recorded Investment, With related allowance		0	[1]		2,111
Recorded Investment, With no related allowance		4,450	[1]		3,918
Related Allowance		0			(864)
Impaired Loans, Unpaid Principal Balance
Unpaid Contractual Principal Balance, With related allowance		0			2,156
Unpaid Contractual Principal Balance, With no related allowance		4,450			3,918
Impaired Loans, Average Recorded Investment
Average Recorded Investment, With related allowance	[1]	1,055		10,314
Average Recorded Investment, With no related allowance	[1]	4,184		0
Impaired Loans, Interest Income Recognized during Impairment
Interest Income Recognized during Impairment, With related allowance		0		94
Interest Income Recognized during Impairment, With no related allowance		51		0
Trade finance | Acquired
Impaired Loans, Recorded Investment
Recorded Investment, With related allowance		0			0
Recorded Investment, With no related allowance		0			0
Related Allowance		0			0
Impaired Loans, Unpaid Principal Balance
Unpaid Contractual Principal Balance, With related allowance		0			0
Unpaid Contractual Principal Balance, With no related allowance		0			0
Impaired Loans, Average Recorded Investment
Average Recorded Investment, With related allowance		0		0
Average Recorded Investment, With no related allowance		0		0
Impaired Loans, Interest Income Recognized during Impairment
Interest Income Recognized during Impairment, With related allowance		0		0
Interest Income Recognized during Impairment, With no related allowance		0		0
Consumer and other
Impaired Loans, Recorded Investment
Recorded Investment, With related allowance		82	[1]		91
Recorded Investment, With no related allowance		905	[1]		1,073
Related Allowance		(40)			(50)
Impaired Loans, Unpaid Principal Balance
Unpaid Contractual Principal Balance, With related allowance		82			91
Unpaid Contractual Principal Balance, With no related allowance		923			1,136
Impaired Loans, Average Recorded Investment
Average Recorded Investment, With related allowance	[1]	87		128
Average Recorded Investment, With no related allowance	[1]	989		1,228
Impaired Loans, Interest Income Recognized during Impairment
Interest Income Recognized during Impairment, With related allowance		1		1
Interest Income Recognized during Impairment, With no related allowance		7		7
Consumer and other | Acquired
Impaired Loans, Recorded Investment
Recorded Investment, With related allowance		0			0
Recorded Investment, With no related allowance		272			431
Related Allowance		0			0
Impaired Loans, Unpaid Principal Balance
Unpaid Contractual Principal Balance, With related allowance		0			0
Unpaid Contractual Principal Balance, With no related allowance		281			$ 484
Impaired Loans, Average Recorded Investment
Average Recorded Investment, With related allowance		0		0
Average Recorded Investment, With no related allowance		351		557
Impaired Loans, Interest Income Recognized during Impairment
Interest Income Recognized during Impairment, With related allowance		0		0
Interest Income Recognized during Impairment, With no related allowance		$ 2		$ 2
[1] Unpaid contractual principal balance less charge offs, interest collected applied to principal if on nonaccrual and purchase discounts.

X

- Definition

Impaired Financing Receivable, Recorded Investment, Net of Allowance

+ References

No definition available.

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Threshold Period Past Due for Nonaccrual Status of Financing Receivable

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Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5212-111524

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 17
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Amount of interest income recognized that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
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Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Amount of allowance for credit losses related to recorded investment.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Recorded Investment
-URI http://asc.fasb.org/extlink&oid=65880944

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Amount of unpaid principal balance of impaired financing receivables with related allowance for credit losses and without related allowance for credit losses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
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Amount of average investment of impaired financing receivables for which there is no related allowance for credit losses.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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