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Quarterly Financial Data - Unaudited (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Operating results:                      
Interest income $ 119,725 $ 99,397 $ 82,976 $ 76,619 $ 71,468 $ 62,737 $ 59,224 $ 54,628 $ 378,717 $ 248,057 $ 246,355
Interest expense (84,961) (64,351) (48,213) (41,514) (36,108) (27,443) (24,234) (21,031) (239,039) (108,816) (88,528)
Net Interest Income 34,764 35,046 34,763 35,105 35,360 35,294 34,990 33,597 139,678 139,241 157,827
Non-interest income (17,679) 32,284 19,521 39,666 10,951 26,070 25,297 27,755 73,792 90,073 58,817
Operating expenses (19,253) (21,490) (19,009) (23,030) (20,367) (19,922) (18,641) (18,226) (82,782) (77,156) (88,786)
Net Income $ (913) $ 40,921 $ 32,747 $ 46,845 $ 30,933 $ 36,180 $ 36,324 $ 36,969 $ 119,600 $ 140,406 $ 131,252
Per share data:                      
Net income - basic (in dollars per share) $ (0.02) $ 0.49 $ 0.42 $ 0.60 $ 0.39 $ 0.46 $ 0.46 $ 0.47 $ 1.47 $ 1.78 $ 1.66
Net Income - diluted (in dollars per share) (0.02) 0.42 0.38 0.50 0.35 0.41 0.43 0.43 1.34 1.60 1.54
Regular dividends declared per common share (in dollars per share) $ 0.3 $ 0.3 $ 0.3 $ 0.28 $ 0.28 $ 0.28 $ 0.28 $ 0.28 $ 1.18 $ 1.12 $ 1.12