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Investment Securities - Investment Category and Length of Time (Details)
$ in Thousands
Mar. 31, 2022
USD ($)
investment_security
Dec. 31, 2021
USD ($)
investment_security
Less than 12 Months    
Number | investment_security 242 204
Fair Value $ 2,134,779 $ 2,302,658
Gross Unrealized Losses $ (124,586) $ (35,173)
12 Months or Longer    
Number | investment_security 62 51
Fair Value $ 608,615 $ 477,926
Gross Unrealized Losses $ (50,610) $ (15,784)
Total    
Number | investment_security 304 255
Fair Value $ 2,743,394 $ 2,780,584
Gross Unrealized Losses $ (175,196) $ (50,957)
U.S. Treasury    
Less than 12 Months    
Number | investment_security 1 3
Fair Value $ 13,990 $ 47,235
Gross Unrealized Losses $ (940) $ (456)
12 Months or Longer    
Number | investment_security 0 0
Fair Value $ 0 $ 0
Gross Unrealized Losses $ 0 $ 0
Total    
Number | investment_security 1 3
Fair Value $ 13,990 $ 47,235
Gross Unrealized Losses $ (940) $ (456)
Agency    
Less than 12 Months    
Number | investment_security 9 19
Fair Value $ 72,300 $ 278,078
Gross Unrealized Losses $ (6,489) $ (5,634)
12 Months or Longer    
Number | investment_security 26 16
Fair Value $ 303,476 $ 119,750
Gross Unrealized Losses $ (24,388) $ (4,495)
Total    
Number | investment_security 35 35
Fair Value $ 375,776 $ 397,828
Gross Unrealized Losses $ (30,877) $ (10,129)
Corporate debt    
Less than 12 Months    
Number | investment_security 44 17
Fair Value $ 449,423 $ 166,563
Gross Unrealized Losses $ (10,400) $ (849)
12 Months or Longer    
Number | investment_security 3 3
Fair Value $ 52,241 $ 57,274
Gross Unrealized Losses $ (7,884) $ (3,007)
Total    
Number | investment_security 47 20
Fair Value $ 501,664 $ 223,837
Gross Unrealized Losses $ (18,284) $ (3,856)
Municipal bonds    
Less than 12 Months    
Number | investment_security 85 36
Fair Value $ 397,687 $ 277,564
Gross Unrealized Losses $ (30,158) $ (4,079)
12 Months or Longer    
Number | investment_security 1 2
Fair Value $ 1,444 $ 6,596
Gross Unrealized Losses $ (153) $ (202)
Total    
Number | investment_security 86 38
Fair Value $ 399,131 $ 284,160
Gross Unrealized Losses $ (30,311) $ (4,281)
Collateralized mortgage obligations    
Less than 12 Months    
Number | investment_security 32 26
Fair Value $ 320,962 $ 226,763
Gross Unrealized Losses $ (10,317) $ (3,738)
12 Months or Longer    
Number | investment_security 23 15
Fair Value $ 165,246 $ 121,185
Gross Unrealized Losses $ (10,415) $ (2,317)
Total    
Number | investment_security 55 41
Fair Value $ 486,208 $ 347,948
Gross Unrealized Losses $ (20,732) $ (6,055)
Mortgage-backed securities    
Less than 12 Months    
Number | investment_security 71 103
Fair Value $ 880,417 $ 1,306,455
Gross Unrealized Losses $ (66,282) $ (20,417)
12 Months or Longer    
Number | investment_security 9 15
Fair Value $ 86,208 $ 173,121
Gross Unrealized Losses $ (7,770) $ (5,763)
Total    
Number | investment_security 80 118
Fair Value $ 966,625 $ 1,479,576
Gross Unrealized Losses $ (74,052) $ (26,180)