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Investment Securities Gross Unrealized Losses and Fair Values of Investments by Category and Length of Time in a Continuous Unrealized Loss Position (Details)
$ in Thousands
Sep. 30, 2021
USD ($)
Security
Dec. 31, 2020
USD ($)
Security
Schedule of Investments [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security 103 22
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months $ 1,026,026 $ 266,636
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss $ (13,001) $ (1,660)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security 119 163
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer $ 92,655 $ 105,077
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (1,812) (3,618)
Debt Securities, Available-for-sale, Unrealized Loss Position 1,118,681 371,713
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss $ (14,813) $ (5,278)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security 39  
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value $ 646,422  
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss $ (20,070)  
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security 0  
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value $ 0  
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 0  
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value 646,422  
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss $ (20,070)  
US Government Debt Securities    
Schedule of Investments [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security 2  
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months $ 153,210  
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss $ (283)  
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security 0  
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer $ 0  
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0  
Debt Securities, Available-for-sale, Unrealized Loss Position 153,210  
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss $ (283)  
US Government Agencies Debt Securities    
Schedule of Investments [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security 1  
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months $ 62,066  
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss $ (71)  
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security 0  
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer $ 0  
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0  
Debt Securities, Available-for-sale, Unrealized Loss Position 62,066  
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss $ (71)  
State and Municipal Securities [Member]    
Schedule of Investments [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security 64  
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months $ 269,388  
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss $ (3,769)  
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security 0  
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer $ 0  
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0  
Debt Securities, Available-for-sale, Unrealized Loss Position 269,388  
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss $ (3,769)  
Corporate Debt Securities [Member]    
Schedule of Investments [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security 3 9
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months $ 13,952 $ 44,528
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss $ (52) $ (377)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security 0 1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer $ 0 $ 6,871
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0 (314)
Debt Securities, Available-for-sale, Unrealized Loss Position 13,952 51,399
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss $ (52) $ (691)
Collateralized Mortgage Obligations [Member]    
Schedule of Investments [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security 1 3
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months $ 29,565 $ 57,601
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss $ (330) $ (115)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security 0 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer $ 0 $ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0 0
Debt Securities, Available-for-sale, Unrealized Loss Position 29,565 57,601
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss $ (330) $ (115)
Residential Mortgage Backed Securities [Member]    
Schedule of Investments [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security 6 1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months $ 129,507 $ 20,124
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss $ (2,574) $ (27)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security 1 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer $ 17,522 $ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (595) 0
Debt Securities, Available-for-sale, Unrealized Loss Position 147,029 20,124
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss $ (3,169) $ (27)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security 12  
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value $ 193,637  
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss $ (6,514)  
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security 0  
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value $ 0  
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 0  
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value 193,637  
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss $ (6,514)  
Commercial Mortgage Backed Securities [Member]    
Schedule of Investments [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security 26 9
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months $ 368,338 $ 144,383
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss $ (5,922) $ (1,141)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security 0 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer $ 0 $ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0 0
Debt Securities, Available-for-sale, Unrealized Loss Position 368,338 144,383
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss $ (5,922) $ (1,141)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security 27  
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value $ 452,785  
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss $ (13,556)  
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security 0  
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value $ 0  
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 0  
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value 452,785  
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss $ (13,556)  
Auction Rate Securities [Member]    
Schedule of Investments [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security 0 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months $ 0 $ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss $ 0 $ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security 118 162
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer $ 75,133 $ 98,206
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (1,217) (3,304)
Debt Securities, Available-for-sale, Unrealized Loss Position 75,133 98,206
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss $ (1,217) $ (3,304)