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Investment Securities - Investments' Gross Unrealized Losses and Fair Value Aggregated by Investment Category and Length of Time in Continuous Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Fair Value    
Less than 12 Months $ 22,515 $ 203,946
12 Months or Longer 0 20,796
Total 22,515 224,742
Gross Unrealized Losses    
Less than 12 Months 187 2,133
12 Months or Longer 0 78
Total 187 2,211
Fair Value    
Less than 12 Months 133,879 150,216
12 Months or Longer 0 20,458
Total 133,879 170,674
Gross Unrealized Losses    
Less than 12 Months 1,278 475
12 Months or Longer 0 70
Total 1,278 545
Less than 12 Months, Fair Value 156,394 354,162
12 Months or Longer, Fair Value 0 41,254
Total, Fair Value 156,394 395,416
Less than 12 Months, Gross Unrealized Losses 1,465 2,608
12 Months or Longer, Gross Unrealized Losses 0 148
Total, Gross Unrealized Losses 1,465 2,756
U.S. Government-sponsored agency securities    
Fair Value    
Less than 12 Months 20,961 3,016
12 Months or Longer 0 12,467
Total 20,961 15,483
Gross Unrealized Losses    
Less than 12 Months 33 4
12 Months or Longer 0 33
Total 33 37
State and municipal    
Fair Value    
Less than 12 Months 22,515 76,273
12 Months or Longer 0 0
Total 22,515 76,273
Gross Unrealized Losses    
Less than 12 Months 187 807
12 Months or Longer 0 0
Total 187 807
Fair Value    
Less than 12 Months 101,136 22,947
12 Months or Longer 0 0
Total 101,136 22,947
Gross Unrealized Losses    
Less than 12 Months 1,240 107
12 Months or Longer 0 0
Total 1,240 107
U.S. Government-sponsored mortgage-backed securities    
Fair Value    
Less than 12 Months   127,673
12 Months or Longer   20,796
Total   148,469
Gross Unrealized Losses    
Less than 12 Months   1,326
12 Months or Longer   78
Total   1,404
Fair Value    
Less than 12 Months 10,284 124,253
12 Months or Longer 0 7,991
Total 10,284 132,244
Gross Unrealized Losses    
Less than 12 Months 3 364
12 Months or Longer 0 37
Total 3 $ 401
Foreign investment    
Fair Value    
Less than 12 Months 1,498  
12 Months or Longer 0  
Total 1,498  
Gross Unrealized Losses    
Less than 12 Months 2  
12 Months or Longer 0  
Total $ 2