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Debt Securities with an Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Available-for-sale, Fair Value    
Less than 12 Months $ 13,372 $ 444,401
12 Months or More 282,981 1,016,813
Total 296,353 1,461,214
Available-for-sale, Unrealized Loss    
Less than 12 Months (84) (3,224)
12 Months or More (1,990) (28,993)
Total (2,074) (32,217)
Held-to-maturity, Fair Value    
Less than 12 Months 0 87,392
12 Months or More 21 126,226
Total 21 213,618
Held-to-maturity, Unrealized Loss    
Less than 12 Months 0 (2,778)
12 Months or More 0 (8,261)
Total 0 (11,039)
U.S. government and federal agency    
Available-for-sale, Fair Value    
Less than 12 Months 5,149 4,287
12 Months or More 8,790 10,519
Total 13,939 14,806
Available-for-sale, Unrealized Loss    
Less than 12 Months (57) (27)
12 Months or More (84) (135)
Total (141) (162)
U.S. government sponsored enterprises    
Available-for-sale, Fair Value    
Less than 12 Months   43,400
12 Months or More   35,544
Total   78,944
Available-for-sale, Unrealized Loss    
Less than 12 Months   (103)
12 Months or More   (411)
Total   (514)
State and local governments    
Available-for-sale, Fair Value    
Less than 12 Months 0 72,080
12 Months or More 5,237 232,244
Total 5,237 304,324
Available-for-sale, Unrealized Loss    
Less than 12 Months 0 (922)
12 Months or More (27) (10,400)
Total (27) (11,322)
Held-to-maturity, Fair Value    
Less than 12 Months 0 87,392
12 Months or More 21 126,226
Total 21 213,618
Held-to-maturity, Unrealized Loss    
Less than 12 Months 0 (2,778)
12 Months or More 0 (8,261)
Total 0 (11,039)
Corporate bonds    
Available-for-sale, Fair Value    
Less than 12 Months 5,054 119,111
12 Months or More 13,519 114,800
Total 18,573 233,911
Available-for-sale, Unrealized Loss    
Less than 12 Months (4) (937)
12 Months or More (19) (676)
Total (23) (1,613)
Residential mortgage-backed securities    
Available-for-sale, Fair Value    
Less than 12 Months 3,169 132,405
12 Months or More 237,479 537,202
Total 240,648 669,607
Available-for-sale, Unrealized Loss    
Less than 12 Months (23) (833)
12 Months or More (1,661) (15,417)
Total (1,684) (16,250)
Commercial mortgage-backed securities    
Available-for-sale, Fair Value    
Less than 12 Months 0 73,118
12 Months or More 17,956 86,504
Total 17,956 159,622
Available-for-sale, Unrealized Loss    
Less than 12 Months 0 (402)
12 Months or More (199) (1,954)
Total $ (199) $ (2,356)