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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
Dec. 31, 2020
Dec. 31, 2019
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Less than 12 Months, Fair Value $ 15,019 $ 203,946
Less than 12 Months, Gross Unrealized Losses 349 2,133
12 Months or Longer, Fair Value 0 20,796
12 Months or Longer, Gross Unrealized Losses 0 78
Total, Fair Value 15,019 224,742
Total, Gross Unrealized Losses 349 2,211
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position [Abstract]    
Less than 12 Months, Fair Value 65,862 150,216
Less than 12 Months, Gross Unrealized Losses 252 475
12 Months or Longer, Fair Value 0 20,458
12 Months or Longer, Gross Unrealized Losses 0 70
Total, Fair Value 65,862 170,674
Total, Gross Unrealized Losses 252 545
Less than 12 Months, Fair Value 80,881 354,162
Less than 12 Months, Gross Unrealized Losses 601 2,608
12 Months or Longer, Fair Value 0 41,254
12 Months or Longer, Gross Unrealized Losses 0 148
Total, Fair Value 80,881 395,416
Total, Gross Unrealized Losses 601 2,756
Government Agency and Municipal Bonds and Notes    
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position [Abstract]    
Less than 12 Months, Fair Value 20,881 3,016
Less than 12 Months, Gross Unrealized Losses 113 4
12 Months or Longer, Fair Value 0 12,467
12 Months or Longer, Gross Unrealized Losses 0 33
Total, Fair Value 20,881 15,483
Total, Gross Unrealized Losses 113 37
State and municipal    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Less than 12 Months, Fair Value 5,368 76,273
Less than 12 Months, Gross Unrealized Losses 246 807
12 Months or Longer, Fair Value 0 0
12 Months or Longer, Gross Unrealized Losses 0 0
Total, Fair Value 5,368 76,273
Total, Gross Unrealized Losses 246 807
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position [Abstract]    
Less than 12 Months, Fair Value 3,477 22,947
Less than 12 Months, Gross Unrealized Losses 32 107
12 Months or Longer, Fair Value 0 0
12 Months or Longer, Gross Unrealized Losses 0 0
Total, Fair Value 3,477 22,947
Total, Gross Unrealized Losses 32 107
U.S. Government-sponsored mortgage-backed securities    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Less than 12 Months, Fair Value 9,651 127,673
Less than 12 Months, Gross Unrealized Losses 103 1,326
12 Months or Longer, Fair Value 0 20,796
12 Months or Longer, Gross Unrealized Losses 0 78
Total, Fair Value 9,651 148,469
Total, Gross Unrealized Losses 103 1,404
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position [Abstract]    
Less than 12 Months, Fair Value 41,504 124,253
Less than 12 Months, Gross Unrealized Losses 107 364
12 Months or Longer, Fair Value 0 7,991
12 Months or Longer, Gross Unrealized Losses 0 37
Total, Fair Value 41,504 132,244
Total, Gross Unrealized Losses $ 107 $ 401