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Debt Securities with an Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Available-for-sale, Fair Value    
Less than 12 Months $ 77,110 $ 444,401
12 Months or More 593,955 1,016,813
Total 671,065 1,461,214
Available-for-sale, Unrealized Loss    
Less than 12 Months (452) (3,224)
12 Months or More (7,573) (28,993)
Total (8,025) (32,217)
Held-to-maturity, Fair Value    
Less than 12 Months 0 87,392
12 Months or More 6,896 126,226
Total 6,896 213,618
Held-to-maturity, Unrealized Loss    
Less than 12 Months 0 (2,778)
12 Months or More (6) (8,261)
Total (6) (11,039)
U.S. government and federal agency    
Available-for-sale, Fair Value    
Less than 12 Months 6,553 4,287
12 Months or More 9,565 10,519
Total 16,118 14,806
Available-for-sale, Unrealized Loss    
Less than 12 Months (71) (27)
12 Months or More (115) (135)
Total (186) (162)
U.S. government sponsored enterprises    
Available-for-sale, Fair Value    
Less than 12 Months 0 43,400
12 Months or More 4,961 35,544
Total 4,961 78,944
Available-for-sale, Unrealized Loss    
Less than 12 Months 0 (103)
12 Months or More (1) (411)
Total (1) (514)
State and local governments    
Available-for-sale, Fair Value    
Less than 12 Months 3,736 72,080
12 Months or More 34,411 232,244
Total 38,147 304,324
Available-for-sale, Unrealized Loss    
Less than 12 Months (4) (922)
12 Months or More (301) (10,400)
Total (305) (11,322)
Held-to-maturity, Fair Value    
Less than 12 Months 0 87,392
12 Months or More 6,896 126,226
Total 6,896 213,618
Held-to-maturity, Unrealized Loss    
Less than 12 Months 0 (2,778)
12 Months or More (6) (8,261)
Total (6) (11,039)
Corporate bonds    
Available-for-sale, Fair Value    
Less than 12 Months 18,409 119,111
12 Months or More 53,314 114,800
Total 71,723 233,911
Available-for-sale, Unrealized Loss    
Less than 12 Months (37) (937)
12 Months or More (202) (676)
Total (239) (1,613)
Residential mortgage-backed securities    
Available-for-sale, Fair Value    
Less than 12 Months 28,049 132,405
12 Months or More 441,716 537,202
Total 469,765 669,607
Available-for-sale, Unrealized Loss    
Less than 12 Months (86) (833)
12 Months or More (6,123) (15,417)
Total (6,209) (16,250)
Commercial mortgage-backed securities    
Available-for-sale, Fair Value    
Less than 12 Months 20,363 73,118
12 Months or More 49,988 86,504
Total 70,351 159,622
Available-for-sale, Unrealized Loss    
Less than 12 Months (254) (402)
12 Months or More (831) (1,954)
Total $ (1,085) $ (2,356)