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Investment Securities (Details 2)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2023
USD ($)
Sep. 30, 2022
USD ($)
Sep. 30, 2023
USD ($)
Sep. 30, 2022
USD ($)
Dec. 31, 2022
USD ($)
Schedule Of Available For Sale Debt Securities [Line Items]          
Total debt securities available-for-sale $ 1,803,865   $ 1,803,865   $ 1,969,171
Gross Unrealized Gains 0   0   651
Gross Unrealized Losses (198,623)   (198,623)   (194,694)
Investment securities available-for-sale 1,605,242   1,605,242   1,775,128
Fair Value          
Less than 12 Months 36,898   36,898   437,158
12 months or Longer 1,568,344   1,568,344   1,300,035
Total fair value 1,605,242   1,605,242   1,737,193
Unrealized Losses          
Less than 12 Months (1,757)   (1,757)   (22,278)
12 months or Longer (196,866)   (196,866)   (172,416)
Total unrealized losses (198,623)   (198,623)   (194,694)
Gross realized gains and losses          
Gross realized gains 0 $ 0 1,286 $ 0  
Gross realized losses 0 0 (1,330) 0  
Net realized (losses) gains 0 $ 0 (44) $ 0  
Investment securities pledged as collateral $ 418,280   $ 418,280   282,870
Number of available-for-sale debt securities 698   698    
Number of available-for-sale debt securities in an unrealized loss position 698   698    
U.S. Treasury and Federal agencies securities          
Schedule Of Available For Sale Debt Securities [Line Items]          
Total debt securities available-for-sale $ 1,028,272   $ 1,028,272   1,090,743
Gross Unrealized Gains 0   0   0
Gross Unrealized Losses (81,310)   (81,310)   (92,145)
Investment securities available-for-sale 946,962   946,962   998,598
Fair Value          
Less than 12 Months 0   0   164,481
12 months or Longer 946,962   946,962   834,117
Total fair value 946,962   946,962   998,598
Unrealized Losses          
Less than 12 Months 0   0   (6,299)
12 months or Longer (81,310)   (81,310)   (85,846)
Total unrealized losses (81,310)   (81,310)   (92,145)
U.S. States and political subdivisions securities          
Schedule Of Available For Sale Debt Securities [Line Items]          
Total debt securities available-for-sale 106,089   106,089   130,670
Gross Unrealized Gains 0   0   591
Gross Unrealized Losses (9,105)   (9,105)   (8,499)
Investment securities available-for-sale 96,984   96,984   122,762
Fair Value          
Less than 12 Months 23,888   23,888   57,592
12 months or Longer 73,096   73,096   38,834
Total fair value 96,984   96,984   96,426
Unrealized Losses          
Less than 12 Months (1,278)   (1,278)   (2,126)
12 months or Longer (7,827)   (7,827)   (6,373)
Total unrealized losses (9,105)   (9,105)   (8,499)
Mortgage-backed securities - Federal agencies          
Schedule Of Available For Sale Debt Securities [Line Items]          
Total debt securities available-for-sale 660,447   660,447   730,672
Gross Unrealized Gains 0   0   60
Gross Unrealized Losses (107,984)   (107,984)   (93,674)
Investment securities available-for-sale 552,463   552,463   637,058
Fair Value          
Less than 12 Months 13,010   13,010   198,469
12 months or Longer 539,453   539,453   426,989
Total fair value 552,463   552,463   625,458
Unrealized Losses          
Less than 12 Months (479)   (479)   (13,482)
12 months or Longer (107,505)   (107,505)   (80,192)
Total unrealized losses (107,984)   (107,984)   (93,674)
Corporate debt securities          
Schedule Of Available For Sale Debt Securities [Line Items]          
Total debt securities available-for-sale 8,457   8,457   16,486
Gross Unrealized Gains 0   0   0
Gross Unrealized Losses (206)   (206)   (355)
Investment securities available-for-sale 8,251   8,251   16,131
Fair Value          
Less than 12 Months 0   0   16,132
12 months or Longer 8,251   8,251   0
Total fair value 8,251   8,251   16,132
Unrealized Losses          
Less than 12 Months 0   0   (355)
12 months or Longer (206)   (206)   0
Total unrealized losses (206)   (206)   (355)
Foreign government and other securities          
Schedule Of Available For Sale Debt Securities [Line Items]          
Total debt securities available-for-sale 600   600   600
Gross Unrealized Gains 0   0   0
Gross Unrealized Losses (18)   (18)   (21)
Investment securities available-for-sale 582   582   579
Fair Value          
Less than 12 Months 0   0   484
12 months or Longer 582   582   95
Total fair value 582   582   579
Unrealized Losses          
Less than 12 Months 0   0   (16)
12 months or Longer (18)   (18)   (5)
Total unrealized losses $ (18)   $ (18)   $ (21)