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Debt Securities with an Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Available-for-sale, Fair Value    
Less than 12 Months $ 289,499 $ 444,401
12 Months or More 46,637 1,016,813
Total 336,136 1,461,214
Available-for-sale, Unrealized Loss    
Less than 12 Months (1,608) (3,224)
12 Months or Longer (479) (28,993)
Total (2,087) (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 464 4,287
12 Months or More 9,902 10,519
Total 10,366 14,806
Available-for-sale, Unrealized Loss    
Less than 12 Months 0 (27)
12 Months or Longer (65) (135)
Total (65) (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 Longer   (411)
Total   (514)
State and local governments    
Available-for-sale, Fair Value    
Less than 12 Months 19,044 72,080
12 Months or More 0 232,244
Total 19,044 304,324
Available-for-sale, Unrealized Loss    
Less than 12 Months (80) (922)
12 Months or Longer 0 (10,400)
Total (80) (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 7,378 119,111
12 Months or More 0 114,800
Total 7,378 233,911
Available-for-sale, Unrealized Loss    
Less than 12 Months (1) (937)
12 Months or Longer 0 (676)
Total (1) (1,613)
Residential mortgage backed securities    
Available-for-sale, Fair Value    
Less than 12 Months 85,562 132,405
12 Months or More 29,038 537,202
Total 114,600 669,607
Available-for-sale, Unrealized Loss    
Less than 12 Months (234) (833)
12 Months or Longer (315) (15,417)
Total (549) (16,250)
Commercial mortgage backed securities    
Available-for-sale, Fair Value    
Less than 12 Months 177,051 73,118
12 Months or More 7,697 86,504
Total 184,748 159,622
Available-for-sale, Unrealized Loss    
Less than 12 Months (1,293) (402)
12 Months or Longer (99) (1,954)
Total $ (1,392) $ (2,356)