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Loans Receivable and Allowance for Loan Losses - Allowance for Loans, by Portfolio Segment and Impairment Method (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Jun. 30, 2016
Mar. 31, 2016
Mar. 31, 2015
Loans by Portfolio Segment and Impairment Method [Abstract]          
Impaired loans (gross carrying value) $ 129,579 $ 140,361      
Specific allowance $ 5,079 $ 7,409      
Loss coverage ratio 3.90% 5.30%      
Non-impaired loans $ 10,421,971 $ 10,404,628      
General allowance $ 73,580 $ 71,934      
Loss coverage ratio 0.70% 0.70%      
Total loans outstanding $ 10,551,550 $ 10,544,989      
Allowance for loan losses - Total $ 78,659 $ 79,343 $ 79,343 $ 76,856 $ 76,408
Loss coverage ratio 0.70% 0.80%      
Real estate          
Loans by Portfolio Segment and Impairment Method [Abstract]          
Total loans outstanding $ 8,291,188 $ 8,154,570      
Real estate | Residential          
Loans by Portfolio Segment and Impairment Method [Abstract]          
Impaired loans (gross carrying value) 1,465 3,562      
Specific allowance 0 0      
Non-impaired loans 56,701 54,322      
General allowance $ 287 $ 209      
Loss coverage ratio 0.50% 0.40%      
Total loans outstanding $ 58,166 $ 57,884      
Allowance for loan losses - Total $ 287 $ 209      
Loss coverage ratio 0.50% 0.40%      
Real estate | Commercial & industrial          
Loans by Portfolio Segment and Impairment Method [Abstract]          
Impaired loans (gross carrying value) $ 90,381 $ 93,088      
Specific allowance $ 2,560 $ 2,002      
Loss coverage ratio 2.80% 2.20%      
Non-impaired loans $ 7,858,463 $ 7,749,485      
General allowance $ 52,827 $ 47,915      
Loss coverage ratio 0.70% 0.60%      
Total loans outstanding $ 7,948,844 $ 7,842,573      
Allowance for loan losses - Total $ 55,387 $ 49,917      
Loss coverage ratio 0.70% 0.60%      
Real estate | Construction          
Loans by Portfolio Segment and Impairment Method [Abstract]          
Impaired loans (gross carrying value) $ 2,856 $ 1,300      
Specific allowance 0 0      
Non-impaired loans 281,322 252,813      
General allowance $ 1,710 $ 1,621      
Loss coverage ratio 0.60% 0.60%      
Total loans outstanding $ 284,178 $ 254,113      
Allowance for loan losses - Total $ 1,710 $ 1,621      
Loss coverage ratio 0.60% 0.60%      
Commercial business          
Loans by Portfolio Segment and Impairment Method [Abstract]          
Impaired loans (gross carrying value) $ 29,440 $ 35,218      
Specific allowance $ 2,479 $ 4,493      
Loss coverage ratio 8.40% 12.80%      
Non-impaired loans $ 1,667,455 $ 1,796,803      
General allowance $ 15,944 $ 19,054      
Loss coverage ratio 1.00% 1.10%      
Total loans outstanding $ 1,696,895 $ 1,832,021      
Allowance for loan losses - Total $ 18,423 $ 23,547      
Loss coverage ratio 1.10% 1.30%      
Trade finance          
Loans by Portfolio Segment and Impairment Method [Abstract]          
Impaired loans (gross carrying value) $ 4,450 $ 6,029      
Specific allowance 0 $ 864      
Loss coverage ratio   14.30%      
Non-impaired loans 138,848 $ 148,899      
General allowance $ 811 $ 1,033      
Loss coverage ratio 0.60% 0.70%      
Total loans outstanding $ 143,298 $ 154,928      
Allowance for loan losses - Total $ 811 $ 1,897      
Loss coverage ratio 0.60% 1.20%      
Consumer and other          
Loans by Portfolio Segment and Impairment Method [Abstract]          
Impaired loans (gross carrying value) $ 987 $ 1,164      
Specific allowance $ 40 $ 50      
Loss coverage ratio 4.10% 4.30%      
Non-impaired loans $ 419,182 $ 402,306      
General allowance $ 2,001 $ 2,102      
Loss coverage ratio 0.50% 0.50%      
Total loans outstanding $ 420,169 $ 403,470      
Allowance for loan losses - Total $ 2,041 $ 2,152      
Loss coverage ratio 0.50% 0.50%      
Acquired          
Loans by Portfolio Segment and Impairment Method [Abstract]          
Specific allowance $ 152 $ 186      
Total loans outstanding 3,635,868 3,823,423      
Acquired | Real estate          
Loans by Portfolio Segment and Impairment Method [Abstract]          
Total loans outstanding 2,741,108 2,809,223      
Allowance for loan losses - Total 13,455 12,791 12,791 12,626 12,823
Acquired | Real estate | Residential          
Loans by Portfolio Segment and Impairment Method [Abstract]          
Specific allowance 0 0      
Total loans outstanding 19,599 20,495      
Acquired | Real estate | Construction          
Loans by Portfolio Segment and Impairment Method [Abstract]          
Specific allowance 0 0      
Total loans outstanding 91,672 78,838      
Acquired | Commercial business          
Loans by Portfolio Segment and Impairment Method [Abstract]          
Specific allowance 122 73      
Total loans outstanding 602,522 717,890      
Allowance for loan losses - Total 944 117 117 154 214
Acquired | Trade finance          
Loans by Portfolio Segment and Impairment Method [Abstract]          
Specific allowance 0 0      
Total loans outstanding 79,717 73,534      
Allowance for loan losses - Total 187 0 0 0 0
Acquired | Consumer and other          
Loans by Portfolio Segment and Impairment Method [Abstract]          
Specific allowance 0 0      
Total loans outstanding 212,521 222,776      
Allowance for loan losses - Total $ 19 $ 36 $ 36 $ 60 $ 62