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Investment Securities - Unrealized Gross Losses and Fair Values of Securities in a Continuous Loss Position (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2023
USD ($)
security
shares
Dec. 31, 2024
USD ($)
security
shares
Dec. 31, 2023
USD ($)
security
shares
Securities in the available-for-sale portfolio in a continuous loss position      
Number of individual securities in a continuous loss position | security 222 159 222
Time in Continuous Loss, Unrealized Losses      
Less Than 12 Months Unrealized Losses $ (564) $ (4,775) $ (564)
12 Months or More Unrealized Losses (302,818) (259,563) (302,818)
Total Unrealized Losses (303,382) (264,338) (303,382)
Time in Continuous Loss, Fair Value      
Less Than 12 Months, Fair Value 63,667 277,688 63,667
12 Months or More Fair Value 2,170,608 1,443,285 2,170,608
Total Fair Value 2,234,275 $ 1,720,973 $ 2,234,275
Number of securities with intent to sell | security   0 0
Credit losses recognized on securities   $ 0 $ 0
Allowance for credit losses, investment securities 0 $ 0 $ 0
Investment securities comprised of collateralized loan obligations rated AA or better and obligations issued by local state and political subdivisions rated AA or better   5.00% 5.00%
Class B restricted shares      
Time in Continuous Loss, Fair Value      
Net realized gain $ 40,800    
Shares held | shares 0 0 0
Number of shares sold | shares 120,000    
U.S. Treasury and government agency debt securities      
Time in Continuous Loss, Unrealized Losses      
12 Months or More Unrealized Losses $ (666) $ (23) $ (666)
Total Unrealized Losses (666) (23) (666)
Time in Continuous Loss, Fair Value      
12 Months or More Fair Value 32,503 8,147 32,503
Total Fair Value 32,503 8,147 32,503
Government-sponsored enterprises debt securities      
Time in Continuous Loss, Unrealized Losses      
12 Months or More Unrealized Losses (408)   (408)
Total Unrealized Losses (408)   (408)
Time in Continuous Loss, Fair Value      
12 Months or More Fair Value 19,592   19,592
Total Fair Value 19,592   19,592
Residential - Government-sponsored enterprises      
Time in Continuous Loss, Unrealized Losses      
Less Than 12 Months Unrealized Losses   (2,997)  
12 Months or More Unrealized Losses (112,124) (99,726) (112,124)
Total Unrealized Losses (112,124) (102,723) (112,124)
Time in Continuous Loss, Fair Value      
Less Than 12 Months, Fair Value   116,084  
12 Months or More Fair Value 783,297 622,029 783,297
Total Fair Value 783,297 738,113 783,297
Residential - Government agency      
Time in Continuous Loss, Unrealized Losses      
Less Than 12 Months Unrealized Losses   (154)  
12 Months or More Unrealized Losses (1,121) (1,460) (1,121)
Total Unrealized Losses (1,121) (1,614) (1,121)
Time in Continuous Loss, Fair Value      
Less Than 12 Months, Fair Value   27,127  
12 Months or More Fair Value 10,182 8,732 10,182
Total Fair Value 10,182 35,859 10,182
Commercial - Government agency      
Time in Continuous Loss, Unrealized Losses      
12 Months or More Unrealized Losses (50,270) (53,223) (50,270)
Total Unrealized Losses (50,270) (53,223) (50,270)
Time in Continuous Loss, Fair Value      
12 Months or More Fair Value 218,674 196,125 218,674
Total Fair Value 218,674 196,125 218,674
Commercial - Government-sponsored enterprises      
Time in Continuous Loss, Unrealized Losses      
12 Months or More Unrealized Losses (7,028) (3,107) (7,028)
Total Unrealized Losses (7,028) (3,107) (7,028)
Time in Continuous Loss, Fair Value      
12 Months or More Fair Value 86,431 44,908 86,431
Total Fair Value 86,431 44,908 86,431
Commercial - Non-agency      
Time in Continuous Loss, Unrealized Losses      
12 Months or More Unrealized Losses (281)   (281)
Total Unrealized Losses (281)   (281)
Time in Continuous Loss, Fair Value      
12 Months or More Fair Value 21,683   21,683
Total Fair Value 21,683   21,683
Government agency      
Time in Continuous Loss, Unrealized Losses      
Less Than 12 Months Unrealized Losses   (712)  
12 Months or More Unrealized Losses (67,568) (54,202) (67,568)
Total Unrealized Losses (67,568) (54,914) (67,568)
Time in Continuous Loss, Fair Value      
Less Than 12 Months, Fair Value   76,968  
12 Months or More Fair Value 471,150 310,171 471,150
Total Fair Value 471,150 387,139 471,150
Government-sponsored enterprises      
Time in Continuous Loss, Unrealized Losses      
Less Than 12 Months Unrealized Losses   (912)  
12 Months or More Unrealized Losses (61,856) (47,822) (61,856)
Total Unrealized Losses (61,856) (48,734) (61,856)
Time in Continuous Loss, Fair Value      
Less Than 12 Months, Fair Value   57,509  
12 Months or More Fair Value 363,970 253,173 363,970
Total Fair Value 363,970 $ 310,682 363,970
Collateralized loan obligations      
Time in Continuous Loss, Unrealized Losses      
Less Than 12 Months Unrealized Losses (564)   (564)
12 Months or More Unrealized Losses (1,496)   (1,496)
Total Unrealized Losses (2,060)   (2,060)
Time in Continuous Loss, Fair Value      
Less Than 12 Months, Fair Value 63,667   63,667
12 Months or More Fair Value 163,126   163,126
Total Fair Value $ 226,793   $ 226,793