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Investment Securities - Unrealized Losses and Fair Value Available for Sale (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Fair Value    
Less than Twelve Months $ 2,206 $ 156,682
More than Twelve Months 821,123 1,456,424
Total 823,329 1,613,106
Unrealized Losses    
Less than Twelve Months (37) (1,050)
More than Twelve Months (9,005) (47,805)
Total (9,042) (48,855)
U.S. Treasury securities    
Fair Value    
Less than Twelve Months 0 0
More than Twelve Months 50,741 49,306
Total 50,741 49,306
Unrealized Losses    
Less than Twelve Months 0 0
More than Twelve Months (222) (1,669)
Total (222) (1,669)
U.S. government agency securities    
Fair Value    
Less than Twelve Months 0 2,120
More than Twelve Months 2,488 26,775
Total 2,488 28,895
Unrealized Losses    
Less than Twelve Months 0 (20)
More than Twelve Months (18) (618)
Total (18) (638)
Obligations of states and state agencies    
Fair Value    
Less than Twelve Months 0 17,560
More than Twelve Months 43,868 75,718
Total 43,868 93,278
Unrealized Losses    
Less than Twelve Months 0 (95)
More than Twelve Months (222) (3,587)
Total (222) (3,682)
Municipal bonds    
Fair Value    
Less than Twelve Months 1,986 5,018
More than Twelve Months 20,335 70,286
Total 22,321 75,304
Unrealized Losses    
Less than Twelve Months (34) (106)
More than Twelve Months (189) (1,331)
Total (223) (1,437)
Obligations of states and political subdivisions    
Fair Value    
Less than Twelve Months 1,986 22,578
More than Twelve Months 64,203 146,004
Total 66,189 168,582
Unrealized Losses    
Less than Twelve Months (34) (201)
More than Twelve Months (411) (4,918)
Total (445) (5,119)
Residential mortgage-backed securities    
Fair Value    
Less than Twelve Months 220 119,645
More than Twelve Months 703,691 1,221,942
Total 703,911 1,341,587
Unrealized Losses    
Less than Twelve Months (3) (668)
More than Twelve Months (8,354) (40,093)
Total $ (8,357) (40,761)
Corporate and other debt securities    
Fair Value    
Less than Twelve Months   12,339
More than Twelve Months   12,397
Total   24,736
Unrealized Losses    
Less than Twelve Months   (161)
More than Twelve Months   (507)
Total   $ (668)