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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
Mar. 31, 2022
USD ($)
Security
Dec. 31, 2021
USD ($)
Security
Schedule of Investments [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security 456 89
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months $ 2,421,243 $ 917,933
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss $ (122,765) $ (13,925)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security 17 119
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer $ 218,029 $ 91,336
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (24,459) (2,331)
Debt Securities, Available-for-sale, Unrealized Loss Position 2,639,272 1,009,269
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss $ (147,224) $ (16,256)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security 21 50
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value $ 206,520 $ 762,923
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss $ (15,785) $ (25,539)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security 33 0
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value $ 505,779 $ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer (61,253) 0
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value 712,299 762,923
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss $ (77,038) $ (25,539)
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 3 2
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months $ 274,072 $ 127,618
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss $ (3,357) $ (213)
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 274,072 127,618
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss $ (3,357) $ (213)
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 255 29
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months $ 807,720 $ 82,731
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss $ (47,968) $ (678)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security 6 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer $ 27,644 $ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (3,412) 0
Debt Securities, Available-for-sale, Unrealized Loss Position 835,364 82,731
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss $ (51,380) $ (678)
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 30 6
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months $ 239,185 $ 43,068
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss $ (7,062) $ (358)
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 239,185 43,068
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss $ (7,062) $ (358)
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 61 4
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months $ 137,670 $ 28,517
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss $ (4,159) $ (754)
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 137,670 28,517
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss $ (4,159) $ (754)
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 24 7
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months $ 154,090 $ 123,687
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss $ (9,253) $ (2,388)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security 6 1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer $ 105,060 $ 16,669
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (11,061) (648)
Debt Securities, Available-for-sale, Unrealized Loss Position 259,150 140,356
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss $ (20,314) $ (3,036)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security 5 14
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value $ 21,104 $ 205,969
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss $ (1,672) $ (7,067)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security 12 0
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value $ 167,470 $ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer (19,425) 0
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value 188,574 205,969
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss $ (21,097) $ (7,067)
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 83 41
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months $ 808,506 $ 512,312
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss $ (50,966) $ (9,534)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security 5 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer $ 85,325 $ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (9,986) 0
Debt Securities, Available-for-sale, Unrealized Loss Position 893,831 512,312
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss $ (60,952) $ (9,534)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security 16 36
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value $ 185,416 $ 556,954
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss $ (14,113) $ (18,472)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security 21 0
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value $ 338,309 $ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer (41,828) 0
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value 523,725 556,954
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss $ (55,941) $ (18,472)
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
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months   $ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss   $ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security   118
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer   $ 74,667
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss   (1,683)
Debt Securities, Available-for-sale, Unrealized Loss Position   74,667
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss   $ (1,683)