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Loans Receivable and Allowance for Loan Losses - Financing Receivable Credit Quality Indicators (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment [Line Items]
Loans	$ 12,097,906	$ 11,102,857
Legacy
Financing Receivable, Recorded Investment [Line Items]
Loans		8,338,522
Acquired
Financing Receivable, Recorded Investment [Line Items]
Loans		2,764,335
Real estate-Residential
Financing Receivable, Recorded Investment [Line Items]
Loans	51,197	49,774
Real estate-Residential | Legacy
Financing Receivable, Recorded Investment [Line Items]
Loans		36,143
Real estate-Residential | Acquired
Financing Receivable, Recorded Investment [Line Items]
Loans		13,631
Real estate-Commercial
Financing Receivable, Recorded Investment [Line Items]
Loans	8,395,327	8,142,036
Real estate-Commercial | Legacy | Retail
Financing Receivable, Recorded Investment [Line Items]
Loans		1,691,388
Real estate-Commercial | Legacy | Hotel & Motel
Financing Receivable, Recorded Investment [Line Items]
Loans		1,252,832
Real estate-Commercial | Legacy | Gas Station & Car Wash
Financing Receivable, Recorded Investment [Line Items]
Loans		747,088
Real estate-Commercial | Legacy | Mixed Use
Financing Receivable, Recorded Investment [Line Items]
Loans		427,813
Real estate-Commercial | Legacy | Industrial & Warehouse
Financing Receivable, Recorded Investment [Line Items]
Loans		618,377
Real estate-Commercial | Legacy | Other
Financing Receivable, Recorded Investment [Line Items]
Loans		1,217,213
Real estate-Commercial | Acquired | Retail
Financing Receivable, Recorded Investment [Line Items]
Loans		658,273
Real estate-Commercial | Acquired | Hotel & Motel
Financing Receivable, Recorded Investment [Line Items]
Loans		304,425
Real estate-Commercial | Acquired | Gas Station & Car Wash
Financing Receivable, Recorded Investment [Line Items]
Loans		205,927
Real estate-Commercial | Acquired | Mixed Use
Financing Receivable, Recorded Investment [Line Items]
Loans		115,327
Real estate-Commercial | Acquired | Industrial & Warehouse
Financing Receivable, Recorded Investment [Line Items]
Loans		281,645
Real estate-Commercial | Acquired | Other
Financing Receivable, Recorded Investment [Line Items]
Loans		621,728
Real estate-Construction
Financing Receivable, Recorded Investment [Line Items]
Loans	275,076	316,412
Real estate-Construction | Legacy
Financing Receivable, Recorded Investment [Line Items]
Loans		222,635
Real estate-Construction | Acquired
Financing Receivable, Recorded Investment [Line Items]
Loans		93,777
Real Estate
Financing Receivable, Recorded Investment [Line Items]
Loans	8,721,600	8,508,222
Real Estate | Legacy
Financing Receivable, Recorded Investment [Line Items]
Loans	7,077,368	6,213,489
Real Estate | Acquired
Financing Receivable, Recorded Investment [Line Items]
Loans	1,644,232	2,294,733
Commercial Business
Financing Receivable, Recorded Investment [Line Items]
Loans	2,127,630	1,780,869
Commercial Business | Legacy
Financing Receivable, Recorded Investment [Line Items]
Loans	2,017,691	1,490,595
Commercial Business | Acquired
Financing Receivable, Recorded Investment [Line Items]
Loans	109,939	290,274
Trade Finance
Financing Receivable, Recorded Investment [Line Items]
Loans	197,190	166,664
Trade Finance | Legacy
Financing Receivable, Recorded Investment [Line Items]
Loans	194,066	156,155
Trade Finance | Acquired
Financing Receivable, Recorded Investment [Line Items]
Loans	3,124	10,509
Consumer and Other
Financing Receivable, Recorded Investment [Line Items]
Loans	1,051,486	647,102
Consumer and Other | Legacy
Financing Receivable, Recorded Investment [Line Items]
Loans	910,733	478,283
Consumer and Other | Acquired
Financing Receivable, Recorded Investment [Line Items]
Loans	140,753	168,819
Pass
Financing Receivable, Recorded Investment [Line Items]
Loans	11,616,490	10,534,382
Pass | Legacy
Financing Receivable, Recorded Investment [Line Items]
Loans	9,884,742	8,007,314
Pass | Acquired
Financing Receivable, Recorded Investment [Line Items]
Loans	1,731,748	2,527,068
Pass | Real estate-Residential | Legacy
Financing Receivable, Recorded Investment [Line Items]
Loans	44,066	33,557
Pass | Real estate-Residential | Acquired
Financing Receivable, Recorded Investment [Line Items]
Loans	5,812	13,369
Pass | Real estate-Commercial | Legacy | Retail
Financing Receivable, Recorded Investment [Line Items]
Loans	1,815,170	1,640,809
Pass | Real estate-Commercial | Legacy | Hotel & Motel
Financing Receivable, Recorded Investment [Line Items]
Loans	1,389,349	1,224,597
Pass | Real estate-Commercial | Legacy | Gas Station & Car Wash
Financing Receivable, Recorded Investment [Line Items]
Loans	814,291	737,485
Pass | Real estate-Commercial | Legacy | Mixed Use
Financing Receivable, Recorded Investment [Line Items]
Loans	510,021	421,755
Pass | Real estate-Commercial | Legacy | Industrial & Warehouse
Financing Receivable, Recorded Investment [Line Items]
Loans	711,236	577,344
Pass | Real estate-Commercial | Legacy | Other
Financing Receivable, Recorded Investment [Line Items]
Loans	1,326,795	1,133,188
Pass | Real estate-Commercial | Acquired | Retail
Financing Receivable, Recorded Investment [Line Items]
Loans	483,939	630,555
Pass | Real estate-Commercial | Acquired | Hotel & Motel
Financing Receivable, Recorded Investment [Line Items]
Loans	186,761	275,191
Pass | Real estate-Commercial | Acquired | Gas Station & Car Wash
Financing Receivable, Recorded Investment [Line Items]
Loans	148,702	194,063
Pass | Real estate-Commercial | Acquired | Mixed Use
Financing Receivable, Recorded Investment [Line Items]
Loans	77,100	94,864
Pass | Real estate-Commercial | Acquired | Industrial & Warehouse
Financing Receivable, Recorded Investment [Line Items]
Loans	171,574	250,049
Pass | Real estate-Commercial | Acquired | Other
Financing Receivable, Recorded Investment [Line Items]
Loans	402,247	568,545
Pass | Real estate-Construction | Legacy
Financing Receivable, Recorded Investment [Line Items]
Loans	227,231	219,583
Pass | Real estate-Construction | Acquired
Financing Receivable, Recorded Investment [Line Items]
Loans	29,058	93,777
Pass | Commercial Business | Legacy
Financing Receivable, Recorded Investment [Line Items]
Loans	1,944,783	1,389,043
Pass | Commercial Business | Acquired
Financing Receivable, Recorded Investment [Line Items]
Loans	89,611	236,705
Pass | Trade Finance | Legacy
Financing Receivable, Recorded Investment [Line Items]
Loans	191,508	152,583
Pass | Trade Finance | Acquired
Financing Receivable, Recorded Investment [Line Items]
Loans	0	7,455
Pass | Consumer and Other | Legacy
Financing Receivable, Recorded Investment [Line Items]
Loans	910,292	477,370
Pass | Consumer and Other | Acquired
Financing Receivable, Recorded Investment [Line Items]
Loans	136,944	162,495
Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans	163,089	214,891
Special Mention | Legacy
Financing Receivable, Recorded Investment [Line Items]
Loans	121,622	151,413
Special Mention | Acquired
Financing Receivable, Recorded Investment [Line Items]
Loans	41,467	63,478
Special Mention | Real estate-Residential | Legacy
Financing Receivable, Recorded Investment [Line Items]
Loans	0	1,147
Special Mention | Real estate-Residential | Acquired
Financing Receivable, Recorded Investment [Line Items]
Loans	393	262
Special Mention | Real estate-Commercial | Legacy | Retail
Financing Receivable, Recorded Investment [Line Items]
Loans	18,072	32,723
Special Mention | Real estate-Commercial | Legacy | Hotel & Motel
Financing Receivable, Recorded Investment [Line Items]
Loans	21,932	19,358
Special Mention | Real estate-Commercial | Legacy | Gas Station & Car Wash
Financing Receivable, Recorded Investment [Line Items]
Loans	2,810	9,013
Special Mention | Real estate-Commercial | Legacy | Mixed Use
Financing Receivable, Recorded Investment [Line Items]
Loans	12,480	4,581
Special Mention | Real estate-Commercial | Legacy | Industrial & Warehouse
Financing Receivable, Recorded Investment [Line Items]
Loans	1,665	16,716
Special Mention | Real estate-Commercial | Legacy | Other
Financing Receivable, Recorded Investment [Line Items]
Loans	35,539	30,030
Special Mention | Real estate-Commercial | Acquired | Retail
Financing Receivable, Recorded Investment [Line Items]
Loans	4,651	6,921
Special Mention | Real estate-Commercial | Acquired | Hotel & Motel
Financing Receivable, Recorded Investment [Line Items]
Loans	807	4,247
Special Mention | Real estate-Commercial | Acquired | Gas Station & Car Wash
Financing Receivable, Recorded Investment [Line Items]
Loans	274	2,872
Special Mention | Real estate-Commercial | Acquired | Mixed Use
Financing Receivable, Recorded Investment [Line Items]
Loans	3,986	5,725
Special Mention | Real estate-Commercial | Acquired | Industrial & Warehouse
Financing Receivable, Recorded Investment [Line Items]
Loans	9,451	14,973
Special Mention | Real estate-Commercial | Acquired | Other
Financing Receivable, Recorded Investment [Line Items]
Loans	12,902	19,848
Special Mention | Real estate-Construction | Legacy
Financing Receivable, Recorded Investment [Line Items]
Loans	10,904	0
Special Mention | Real estate-Construction | Acquired
Financing Receivable, Recorded Investment [Line Items]
Loans	7,883	0
Special Mention | Commercial Business | Legacy
Financing Receivable, Recorded Investment [Line Items]
Loans	18,220	35,640
Special Mention | Commercial Business | Acquired
Financing Receivable, Recorded Investment [Line Items]
Loans	1,083	8,593
Special Mention | Trade Finance | Legacy
Financing Receivable, Recorded Investment [Line Items]
Loans	0	2,200
Special Mention | Trade Finance | Acquired
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Special Mention | Consumer and Other | Legacy
Financing Receivable, Recorded Investment [Line Items]
Loans	0	5
Special Mention | Consumer and Other | Acquired
Financing Receivable, Recorded Investment [Line Items]
Loans	37	37
Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans	317,915	353,222
Substandard | Legacy
Financing Receivable, Recorded Investment [Line Items]
Loans	193,494	179,795
Substandard | Acquired
Financing Receivable, Recorded Investment [Line Items]
Loans	124,421	173,427
Substandard | Real estate-Residential | Legacy
Financing Receivable, Recorded Investment [Line Items]
Loans	546	1,439
Substandard | Real estate-Residential | Acquired
Financing Receivable, Recorded Investment [Line Items]
Loans	380	0
Substandard | Real estate-Commercial | Legacy | Retail
Financing Receivable, Recorded Investment [Line Items]
Loans	30,686	17,856
Substandard | Real estate-Commercial | Legacy | Hotel & Motel
Financing Receivable, Recorded Investment [Line Items]
Loans	15,869	8,877
Substandard | Real estate-Commercial | Legacy | Gas Station & Car Wash
Financing Receivable, Recorded Investment [Line Items]
Loans	2,464	590
Substandard | Real estate-Commercial | Legacy | Mixed Use
Financing Receivable, Recorded Investment [Line Items]
Loans	13,292	1,477
Substandard | Real estate-Commercial | Legacy | Industrial & Warehouse
Financing Receivable, Recorded Investment [Line Items]
Loans	38,332	24,317
Substandard | Real estate-Commercial | Legacy | Other
Financing Receivable, Recorded Investment [Line Items]
Loans	34,618	53,995
Substandard | Real estate-Commercial | Acquired | Retail
Financing Receivable, Recorded Investment [Line Items]
Loans	17,332	20,797
Substandard | Real estate-Commercial | Acquired | Hotel & Motel
Financing Receivable, Recorded Investment [Line Items]
Loans	19,472	24,987
Substandard | Real estate-Commercial | Acquired | Gas Station & Car Wash
Financing Receivable, Recorded Investment [Line Items]
Loans	6,032	8,992
Substandard | Real estate-Commercial | Acquired | Mixed Use
Financing Receivable, Recorded Investment [Line Items]
Loans	8,151	14,738
Substandard | Real estate-Commercial | Acquired | Industrial & Warehouse
Financing Receivable, Recorded Investment [Line Items]
Loans	18,071	16,358
Substandard | Real estate-Commercial | Acquired | Other
Financing Receivable, Recorded Investment [Line Items]
Loans	28,996	33,335
Substandard | Real estate-Construction | Legacy
Financing Receivable, Recorded Investment [Line Items]
Loans	0	3,052
Substandard | Real estate-Construction | Acquired
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Substandard | Commercial Business | Legacy
Financing Receivable, Recorded Investment [Line Items]
Loans	54,688	65,912
Substandard | Commercial Business | Acquired
Financing Receivable, Recorded Investment [Line Items]
Loans	19,237	44,964
Substandard | Trade Finance | Legacy
Financing Receivable, Recorded Investment [Line Items]
Loans	2,558	1,372
Substandard | Trade Finance | Acquired
Financing Receivable, Recorded Investment [Line Items]
Loans	3,124	3,054
Substandard | Consumer and Other | Legacy
Financing Receivable, Recorded Investment [Line Items]
Loans	441	908
Substandard | Consumer and Other | Acquired
Financing Receivable, Recorded Investment [Line Items]
Loans	3,626	6,202
Doubtful/ Loss
Financing Receivable, Recorded Investment [Line Items]
Loans	412	362
Doubtful/ Loss | Legacy
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Doubtful/ Loss | Acquired
Financing Receivable, Recorded Investment [Line Items]
Loans	412	362
Doubtful/ Loss | Real estate-Residential | Legacy
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Doubtful/ Loss | Real estate-Residential | Acquired
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Doubtful/ Loss | Real estate-Commercial | Legacy | Retail
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Doubtful/ Loss | Real estate-Commercial | Legacy | Hotel & Motel
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Doubtful/ Loss | Real estate-Commercial | Legacy | Gas Station & Car Wash
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Doubtful/ Loss | Real estate-Commercial | Legacy | Mixed Use
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Doubtful/ Loss | Real estate-Commercial | Legacy | Industrial & Warehouse
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Doubtful/ Loss | Real estate-Commercial | Legacy | Other
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Doubtful/ Loss | Real estate-Commercial | Acquired | Retail
Financing Receivable, Recorded Investment [Line Items]
Loans	35	0
Doubtful/ Loss | Real estate-Commercial | Acquired | Hotel & Motel
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Doubtful/ Loss | Real estate-Commercial | Acquired | Gas Station & Car Wash
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Doubtful/ Loss | Real estate-Commercial | Acquired | Mixed Use
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Doubtful/ Loss | Real estate-Commercial | Acquired | Industrial & Warehouse
Financing Receivable, Recorded Investment [Line Items]
Loans	223	265
Doubtful/ Loss | Real estate-Commercial | Acquired | Other
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Doubtful/ Loss | Real estate-Construction | Legacy
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Doubtful/ Loss | Real estate-Construction | Acquired
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Doubtful/ Loss | Commercial Business | Legacy
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Doubtful/ Loss | Commercial Business | Acquired
Financing Receivable, Recorded Investment [Line Items]
Loans	8	12
Doubtful/ Loss | Trade Finance | Legacy
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Doubtful/ Loss | Trade Finance | Acquired
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Doubtful/ Loss | Consumer and Other | Legacy
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Doubtful/ Loss | Consumer and Other | Acquired
Financing Receivable, Recorded Investment [Line Items]
Loans	146	$ 85
Non Pass
Financing Receivable, Recorded Investment [Line Items]
Loans	12,097,906
Non Pass | Legacy
Financing Receivable, Recorded Investment [Line Items]
Loans	10,199,858
Non Pass | Acquired
Financing Receivable, Recorded Investment [Line Items]
Loans	1,898,048
Non Pass | Real estate-Residential | Legacy
Financing Receivable, Recorded Investment [Line Items]
Loans	44,612
Non Pass | Real estate-Residential | Acquired
Financing Receivable, Recorded Investment [Line Items]
Loans	6,585
Non Pass | Real estate-Commercial | Legacy | Retail
Financing Receivable, Recorded Investment [Line Items]
Loans	1,863,928
Non Pass | Real estate-Commercial | Legacy | Hotel & Motel
Financing Receivable, Recorded Investment [Line Items]
Loans	1,427,150
Non Pass | Real estate-Commercial | Legacy | Gas Station & Car Wash
Financing Receivable, Recorded Investment [Line Items]
Loans	819,565
Non Pass | Real estate-Commercial | Legacy | Mixed Use
Financing Receivable, Recorded Investment [Line Items]
Loans	535,793
Non Pass | Real estate-Commercial | Legacy | Industrial & Warehouse
Financing Receivable, Recorded Investment [Line Items]
Loans	751,233
Non Pass | Real estate-Commercial | Legacy | Other
Financing Receivable, Recorded Investment [Line Items]
Loans	1,396,952
Non Pass | Real estate-Commercial | Acquired | Retail
Financing Receivable, Recorded Investment [Line Items]
Loans	505,957
Non Pass | Real estate-Commercial | Acquired | Hotel & Motel
Financing Receivable, Recorded Investment [Line Items]
Loans	207,040
Non Pass | Real estate-Commercial | Acquired | Gas Station & Car Wash
Financing Receivable, Recorded Investment [Line Items]
Loans	155,008
Non Pass | Real estate-Commercial | Acquired | Mixed Use
Financing Receivable, Recorded Investment [Line Items]
Loans	89,237
Non Pass | Real estate-Commercial | Acquired | Industrial & Warehouse
Financing Receivable, Recorded Investment [Line Items]
Loans	199,319
Non Pass | Real estate-Commercial | Acquired | Other
Financing Receivable, Recorded Investment [Line Items]
Loans	444,145
Non Pass | Real estate-Construction | Legacy
Financing Receivable, Recorded Investment [Line Items]
Loans	238,135
Non Pass | Real estate-Construction | Acquired
Financing Receivable, Recorded Investment [Line Items]
Loans	36,941
Non Pass | Commercial Business | Legacy
Financing Receivable, Recorded Investment [Line Items]
Loans	2,017,691
Non Pass | Commercial Business | Acquired
Financing Receivable, Recorded Investment [Line Items]
Loans	109,939
Non Pass | Trade Finance | Legacy
Financing Receivable, Recorded Investment [Line Items]
Loans	194,066
Non Pass | Trade Finance | Acquired
Financing Receivable, Recorded Investment [Line Items]
Loans	3,124
Non Pass | Consumer and Other | Legacy
Financing Receivable, Recorded Investment [Line Items]
Loans	910,733
Non Pass | Consumer and Other | Acquired
Financing Receivable, Recorded Investment [Line Items]
Loans	$ 140,753

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+ References

No definition available.

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- Definition

Amount representing an agreement for an unconditional promise by the maker to pay the entity (holder) a definite sum of money at a future date. Such amount may include accrued interest receivable in accordance with the terms of the note. The note also may contain provisions and related items including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among a myriad of other features and characteristics. Excludes amounts related to receivables held-for-sale.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.10(3))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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