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Investment Securities - Unrealized Losses and Fair Value Available for Sale (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Fair Value    
Less than Twelve Months $ 34,788 $ 156,682
More than Twelve Months 1,361,318 1,456,424
Total 1,396,106 1,613,106
Unrealized Losses    
Less than Twelve Months (253) (1,050)
More than Twelve Months (27,939) (47,805)
Total (28,192) (48,855)
U.S. Treasury securities    
Fair Value    
Less than Twelve Months 0 0
More than Twelve Months 49,852 49,306
Total 49,852 49,306
Unrealized Losses    
Less than Twelve Months 0 0
More than Twelve Months (1,115) (1,669)
Total (1,115) (1,669)
U.S. government agency securities    
Fair Value    
Less than Twelve Months 0 2,120
More than Twelve Months 27,180 26,775
Total 27,180 28,895
Unrealized Losses    
Less than Twelve Months 0 (20)
More than Twelve Months (238) (618)
Total (238) (638)
Obligations of states and state agencies    
Fair Value    
Less than Twelve Months 1,549 17,560
More than Twelve Months 65,205 75,718
Total 66,754 93,278
Unrealized Losses    
Less than Twelve Months (2) (95)
More than Twelve Months (2,838) (3,587)
Total (2,840) (3,682)
Municipal bonds    
Fair Value    
Less than Twelve Months 1,624 5,018
More than Twelve Months 40,689 70,286
Total 42,313 75,304
Unrealized Losses    
Less than Twelve Months (47) (106)
More than Twelve Months (249) (1,331)
Total (296) (1,437)
Obligations of states and political subdivisions    
Fair Value    
Less than Twelve Months 3,173 22,578
More than Twelve Months 105,894 146,004
Total 109,067 168,582
Unrealized Losses    
Less than Twelve Months (49) (201)
More than Twelve Months (3,087) (4,918)
Total (3,136) (5,119)
Residential mortgage-backed securities    
Fair Value    
Less than Twelve Months 24,221 119,645
More than Twelve Months 1,163,750 1,221,942
Total 1,187,971 1,341,587
Unrealized Losses    
Less than Twelve Months (98) (668)
More than Twelve Months (23,226) (40,093)
Total (23,324) (40,761)
Corporate and other debt securities    
Fair Value    
Less than Twelve Months 7,394 12,339
More than Twelve Months 14,642 12,397
Total 22,036 24,736
Unrealized Losses    
Less than Twelve Months (106) (161)
More than Twelve Months (273) (507)
Total $ (379) $ (668)