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Debt Securities with an Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Available-for-sale, Fair Value    
Less than 12 Months $ 290,675 $ 444,401
12 Months or More 53,518 1,016,813
Total 344,193 1,461,214
Available-for-sale, Unrealized Loss    
Less than 12 Months (589) (3,224)
12 Months or More (590) (28,993)
Total (1,179) (32,217)
Held-to-maturity, Fair Value    
Less than 12 Months   87,392
12 Months or More   126,226
Total   213,618
Held-to-maturity, Unrealized Loss    
Less than 12 Months   (2,778)
12 Months or More   (8,261)
Total   (11,039)
U.S. government and federal agency    
Available-for-sale, Fair Value    
Less than 12 Months 129,520 4,287
12 Months or More 9,440 10,519
Total 138,960 14,806
Available-for-sale, Unrealized Loss    
Less than 12 Months (89) (27)
12 Months or More (78) (135)
Total (167) (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   72,080
12 Months or More   232,244
Total   304,324
Available-for-sale, Unrealized Loss    
Less than 12 Months   (922)
12 Months or More   (10,400)
Total   (11,322)
Held-to-maturity, Fair Value    
Less than 12 Months   87,392
12 Months or More   126,226
Total   213,618
Held-to-maturity, Unrealized Loss    
Less than 12 Months   (2,778)
12 Months or More   (8,261)
Total   (11,039)
Corporate bonds    
Available-for-sale, Fair Value    
Less than 12 Months 6,786 119,111
12 Months or More 0 114,800
Total 6,786 233,911
Available-for-sale, Unrealized Loss    
Less than 12 Months (5) (937)
12 Months or More 0 (676)
Total (5) (1,613)
Residential mortgage-backed securities    
Available-for-sale, Fair Value    
Less than 12 Months 144,444 132,405
12 Months or More 36,324 537,202
Total 180,768 669,607
Available-for-sale, Unrealized Loss    
Less than 12 Months (380) (833)
12 Months or More (444) (15,417)
Total (824) (16,250)
Commercial mortgage-backed securities    
Available-for-sale, Fair Value    
Less than 12 Months 9,925 73,118
12 Months or More 7,754 86,504
Total 17,679 159,622
Available-for-sale, Unrealized Loss    
Less than 12 Months (115) (402)
12 Months or More (68) (1,954)
Total $ (183) $ (2,356)