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Securities - Unrealized Loss on Securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Available-for-sale, Unrealized Loss Position [Abstract]    
Less than 12 Months, fair value $ 125,605 $ 115,902
More than 12 Months, fair value 36,895 1,345,243
Total fair value 162,500 1,461,145
Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 Months, unrealized loss 1,088 1,247
More than 12 Months, unrealized Loss 322 33,356
Total unrealized loss 1,410 34,603
Held-to-maturity, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 months, fair value 287 5,460
More than 12 Months, fair value 4,157 142,236
Total fair value 4,444 147,696
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Losses [Abstract]    
Less than 12 months, unrealized loss 3 63
More than 12 months, unrealized loss 118 3,447
Total unrealized loss 121 3,510
State and political subdivisions    
Available-for-sale, Unrealized Loss Position [Abstract]    
Less than 12 Months, fair value 74,770 98,112
More than 12 Months, fair value 7,580 399,205
Total fair value 82,350 497,317
Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 Months, unrealized loss 794 899
More than 12 Months, unrealized Loss 128 16,757
Total unrealized loss 922 17,656
Held-to-maturity, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 months, fair value   235
More than 12 Months, fair value   2,022
Total fair value   2,257
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Losses [Abstract]    
Less than 12 months, unrealized loss   1
More than 12 months, unrealized loss   41
Total unrealized loss   42
Other stocks and bonds    
Available-for-sale, Unrealized Loss Position [Abstract]    
Less than 12 Months, fair value 0 2,709
More than 12 Months, fair value 2,956 0
Total fair value 2,956 2,709
Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 Months, unrealized loss 0 291
More than 12 Months, unrealized Loss 44 0
Total unrealized loss 44 291
Residential    
Available-for-sale, Unrealized Loss Position [Abstract]    
Less than 12 Months, fair value 50,835 5,552
More than 12 Months, fair value 24,908 488,334
Total fair value 75,743 493,886
Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 Months, unrealized loss 294 27
More than 12 Months, unrealized Loss 147 9,084
Total unrealized loss 441 9,111
Held-to-maturity, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 months, fair value 287 4,826
More than 12 Months, fair value 2,316 51,046
Total fair value 2,603 55,872
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Losses [Abstract]    
Less than 12 months, unrealized loss 3 60
More than 12 months, unrealized loss 107 1,080
Total unrealized loss 110 1,140
Commercial    
Available-for-sale, Unrealized Loss Position [Abstract]    
Less than 12 Months, fair value 0 9,529
More than 12 Months, fair value 1,451 457,704
Total fair value 1,451 467,233
Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 Months, unrealized loss 0 30
More than 12 Months, unrealized Loss 3 7,515
Total unrealized loss 3 7,545
Held-to-maturity, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 months, fair value 0 399
More than 12 Months, fair value 1,841 89,168
Total fair value 1,841 89,567
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Losses [Abstract]    
Less than 12 months, unrealized loss 0 2
More than 12 months, unrealized loss 11 2,326
Total unrealized loss $ 11 $ 2,328