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Loans Receivable and Allowance for Loan Losses - Allowance for Loans, by Portfolio Segment and Impairment Method (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Loans by Portfolio Segment and Impairment Method [Abstract]        
Impaired loans, gross carrying value $ 104,007 $ 114,349    
Specific allowance $ 4,791 $ 5,323    
Loss coverage ratio 4.61% 4.66%    
Non-impaired loans $ 11,993,899 $ 10,988,508    
General allowance $ 87,766 $ 79,218    
Loss coverage ratio 0.73% 0.72%    
Total loans outstanding $ 12,097,906 $ 11,102,857    
Allowance for loan losses - Total $ 92,557 $ 84,541 $ 79,343 $ 76,408
Loss coverage ratio 0.77% 0.76%    
Real estate-Residential        
Loans by Portfolio Segment and Impairment Method [Abstract]        
Impaired loans, gross carrying value $ 0 $ 0    
Specific allowance 0 0    
Non-impaired loans 51,197 49,774    
General allowance $ 112 $ 88    
Loss coverage ratio 0.22% 0.18%    
Total loans outstanding $ 51,197 $ 49,774    
Allowance for loan losses - Total $ 112 $ 88    
Loss coverage ratio 0.22% 0.18%    
Real estate-Commercial        
Loans by Portfolio Segment and Impairment Method [Abstract]        
Impaired loans, gross carrying value $ 58,056 $ 53,980    
Specific allowance $ 437 $ 1,624    
Loss coverage ratio 0.75% 3.01%    
Non-impaired loans $ 8,337,271 $ 8,088,056    
General allowance $ 55,453 $ 56,040    
Loss coverage ratio 0.67% 0.69%    
Total loans outstanding $ 8,395,327 $ 8,142,036    
Allowance for loan losses - Total $ 55,890 $ 57,664    
Loss coverage ratio 0.67% 0.71%    
Real estate-Construction        
Loans by Portfolio Segment and Impairment Method [Abstract]        
Impaired loans, gross carrying value $ 0 $ 1,300    
Specific allowance 0 0    
Non-impaired loans 275,076 315,112    
General allowance $ 765 $ 930    
Loss coverage ratio 0.28% 0.30%    
Total loans outstanding $ 275,076 $ 316,412    
Allowance for loan losses - Total $ 765 $ 930    
Loss coverage ratio 0.28% 0.29%    
Commercial Business        
Loans by Portfolio Segment and Impairment Method [Abstract]        
Impaired loans, gross carrying value $ 35,358 $ 50,055    
Specific allowance $ 4,351 $ 3,661    
Loss coverage ratio 12.31% 7.31%    
Non-impaired loans $ 2,092,272 $ 1,730,814    
General allowance $ 23,414 $ 17,094    
Loss coverage ratio 1.12% 0.99%    
Total loans outstanding $ 2,127,630 $ 1,780,869    
Allowance for loan losses - Total $ 27,765 $ 20,755    
Loss coverage ratio 1.30% 1.17%    
Trade finance        
Loans by Portfolio Segment and Impairment Method [Abstract]        
Impaired loans, gross carrying value $ 9,011 $ 6,935    
Specific allowance $ 0 $ 3    
Loss coverage ratio 0.00% 0.04%    
Non-impaired loans $ 188,179 $ 159,729    
General allowance $ 719 $ 1,713    
Loss coverage ratio 0.38% 1.07%    
Total loans outstanding $ 197,190 $ 166,664    
Allowance for loan losses - Total $ 719 $ 1,716    
Loss coverage ratio 0.36% 1.03%    
Consumer and Other        
Loans by Portfolio Segment and Impairment Method [Abstract]        
Impaired loans, gross carrying value $ 1,582 $ 2,079    
Specific allowance $ 3 $ 35    
Loss coverage ratio 0.19% 1.68%    
Non-impaired loans $ 1,049,904 $ 645,023    
General allowance $ 7,303 $ 3,353    
Loss coverage ratio 0.70% 0.52%    
Total loans outstanding $ 1,051,486 $ 647,102    
Allowance for loan losses - Total $ 7,306 $ 3,388    
Loss coverage ratio 0.69% 0.52%    
Real Estate        
Loans by Portfolio Segment and Impairment Method [Abstract]        
Total loans outstanding $ 8,721,600 $ 8,508,222    
Legacy        
Loans by Portfolio Segment and Impairment Method [Abstract]        
Total loans outstanding   8,338,522    
Legacy | Real estate-Residential        
Loans by Portfolio Segment and Impairment Method [Abstract]        
Total loans outstanding   36,143    
Legacy | Real estate-Construction        
Loans by Portfolio Segment and Impairment Method [Abstract]        
Total loans outstanding   222,635    
Legacy | Commercial Business        
Loans by Portfolio Segment and Impairment Method [Abstract]        
Total loans outstanding 2,017,691 1,490,595    
Allowance for loan losses - Total 21,826 17,228 23,430 16,332
Legacy | Trade finance        
Loans by Portfolio Segment and Impairment Method [Abstract]        
Total loans outstanding 194,066 156,155    
Allowance for loan losses - Total 719 1,674 1,897 3,592
Legacy | Consumer and Other        
Loans by Portfolio Segment and Impairment Method [Abstract]        
Total loans outstanding 910,733 478,283    
Allowance for loan losses - Total 6,269 3,385 2,116 556
Legacy | Real Estate        
Loans by Portfolio Segment and Impairment Method [Abstract]        
Total loans outstanding 7,077,368 6,213,489    
Allowance for loan losses - Total 49,446 45,360 38,956 42,829
Acquired        
Loans by Portfolio Segment and Impairment Method [Abstract]        
Specific allowance 391 1,100    
Total loans outstanding   2,764,335    
Acquired | Real estate-Residential        
Loans by Portfolio Segment and Impairment Method [Abstract]        
Specific allowance 0 0    
Total loans outstanding   13,631    
Acquired | Real estate-Construction        
Loans by Portfolio Segment and Impairment Method [Abstract]        
Specific allowance 0 0    
Total loans outstanding   93,777    
Acquired | Commercial Business        
Loans by Portfolio Segment and Impairment Method [Abstract]        
Specific allowance 130 854    
Total loans outstanding 109,939 290,274    
Allowance for loan losses - Total 5,939 3,527 117 214
Acquired | Trade finance        
Loans by Portfolio Segment and Impairment Method [Abstract]        
Specific allowance 0 0    
Total loans outstanding 3,124 10,509    
Allowance for loan losses - Total 0 42 0 0
Acquired | Consumer and Other        
Loans by Portfolio Segment and Impairment Method [Abstract]        
Specific allowance 0 0    
Total loans outstanding 140,753 168,819    
Allowance for loan losses - Total 1,037 3 36 62
Acquired | Real Estate        
Loans by Portfolio Segment and Impairment Method [Abstract]        
Total loans outstanding 1,644,232 2,294,733    
Allowance for loan losses - Total $ 7,321 $ 13,322 $ 12,791 $ 12,823