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Securities - Unrealized Loss on Securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Available-for-sale, Unrealized Loss Position [Abstract]    
Less than 12 Months, fair value $ 433,487 $ 39,898
More than 12 Months, fair value 4,602 0
Total fair value 438,089 39,898
Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 Months, unrealized loss 7,043 282
More than 12 Months, unrealized Loss 277 0
Total unrealized loss 7,320 282
State and political subdivisions    
Available-for-sale, Unrealized Loss Position [Abstract]    
Less than 12 Months, fair value 396,345 17,305
More than 12 Months, fair value 0 0
Total fair value 396,345 17,305
Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 Months, unrealized loss 6,477 37
More than 12 Months, unrealized Loss 0 0
Total unrealized loss 6,477 37
Corporate bonds and other    
Available-for-sale, Unrealized Loss Position [Abstract]    
Less than 12 Months, fair value 21,352 11,562
More than 12 Months, fair value 0 0
Total fair value 21,352 11,562
Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 Months, unrealized loss 196 22
More than 12 Months, unrealized Loss 0 0
Total unrealized loss 196 22
Residential    
Available-for-sale, Unrealized Loss Position [Abstract]    
Less than 12 Months, fair value 15,790 6,287
More than 12 Months, fair value 0 0
Total fair value 15,790 6,287
Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 Months, unrealized loss 370 73
More than 12 Months, unrealized Loss 0 0
Total unrealized loss 370 73
Commercial    
Available-for-sale, Unrealized Loss Position [Abstract]    
Less than 12 Months, fair value 0 4,744
More than 12 Months, fair value 4,602 0
Total fair value 4,602 4,744
Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 Months, unrealized loss 0 150
More than 12 Months, unrealized Loss 277 0
Total unrealized loss $ 277 $ 150