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Securities - Unrealized Loss on Securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Available-for-sale, Unrealized Loss Position [Abstract]    
Less than 12 Months, fair value $ 53,443 $ 273,963
More than 12 Months, fair value 0 30,697
Total fair value 53,443 304,660
Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 Months, unrealized loss 473 2,282
More than 12 Months, unrealized Loss 0 288
Total unrealized loss 473 2,570
Held-to-maturity, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 months, fair value   13,053
More than 12 Months, fair value   4,092
Total fair value   17,145
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Losses [Abstract]    
Less than 12 months, unrealized loss   76
More than 12 months, unrealized loss   146
Total unrealized loss   222
State and political subdivisions    
Available-for-sale, Unrealized Loss Position [Abstract]    
Less than 12 Months, fair value 32,638 158,629
More than 12 Months, fair value 0 7,555
Total fair value 32,638 166,184
Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 Months, unrealized loss 294 1,270
More than 12 Months, unrealized Loss 0 136
Total unrealized loss 294 1,406
Other stocks and bonds    
Available-for-sale, Unrealized Loss Position [Abstract]    
Less than 12 Months, fair value 9,946  
More than 12 Months, fair value 0  
Total fair value 9,946  
Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 Months, unrealized loss 54  
More than 12 Months, unrealized Loss 0  
Total unrealized loss 54  
Residential    
Available-for-sale, Unrealized Loss Position [Abstract]    
Less than 12 Months, fair value 6,062 101,779
More than 12 Months, fair value 0 21,696
Total fair value 6,062 123,475
Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 Months, unrealized loss 27 980
More than 12 Months, unrealized Loss 0 150
Total unrealized loss 27 1,130
Held-to-maturity, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 months, fair value   272
More than 12 Months, fair value   2,304
Total fair value   2,576
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Losses [Abstract]    
Less than 12 months, unrealized loss   9
More than 12 months, unrealized loss   130
Total unrealized loss   139
Commercial    
Available-for-sale, Unrealized Loss Position [Abstract]    
Less than 12 Months, fair value 4,797 13,555
More than 12 Months, fair value 0 1,446
Total fair value 4,797 15,001
Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 Months, unrealized loss 98 32
More than 12 Months, unrealized Loss 0 2
Total unrealized loss $ 98 34
Held-to-maturity, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 months, fair value   12,781
More than 12 Months, fair value   1,788
Total fair value   14,569
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Losses [Abstract]    
Less than 12 months, unrealized loss   67
More than 12 months, unrealized loss   16
Total unrealized loss   $ 83