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Quarterly Financial Data - Unaudited (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Operating results:                      
Interest income $ 71,468 $ 62,737 $ 59,224 $ 54,628 $ 56,334 $ 60,906 $ 66,787 $ 62,328 $ 248,057 $ 246,355 $ 259,432
Interest expense (36,108) (27,443) (24,234) (21,031) (20,537) (21,597) (22,444) (23,950) (108,816) (88,528) (95,883)
Net Interest Income 35,360 35,294 34,990 33,597 35,797 39,309 44,343 38,378 139,241 157,827 163,549
Reversal of (provision for) loan losses         0 859 6,532 (289) 0 7,102 355
Non-interest income 10,951 26,070 25,297 27,755 9,763 33,712 10,888 4,454 90,073 58,817 25,254
Operating expenses (20,367) (19,922) (18,641) (18,226) (17,824) (20,355) (20,155) (30,452) (77,156) (88,786) (97,416)
Net Income $ 30,933 $ 36,180 $ 36,324 $ 36,969 $ 25,355 $ 52,553 $ 41,281 $ 12,063 $ 140,406 $ 131,252 $ 102,088
Per share data:                      
Net income - basic (in dollars per share) $ 0.39 $ 0.46 $ 0.46 $ 0.47 $ 0.32 $ 0.67 $ 0.52 $ 0.15 $ 1.78 $ 1.66 $ 1.20
Net Income - diluted (in dollars per share) 0.35 0.41 0.43 0.43 0.31 0.58 0.48 0.15 1.60 1.54 1.18
Regular dividends declared per common share (in dollars per share) $ 0.28 $ 0.28 $ 0.28 $ 0.28 $ 0.28 $ 0.28 $ 0.28 $ 0.28 $ 1.12 $ 1.12 $ 1.12
Yield maintenance fees received             $ 5,000        
Loans and Leases Receivable Disclosure [Line Items]                      
Costs incurred and expensed               $ 10,000 $ 0 $ 10,401 $ 0
Commercial Loans At Lower Of Cost Or Market                      
Loans and Leases Receivable Disclosure [Line Items]                      
Realized gains, net           $ 5,000