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Reclassification Adjustments Out of Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Reclassification Adjustment out of AOCI [Abstract]    
Net securities (gains) losses $ 467 $ (812)
Interest income (expense) 79,055 77,181
Other noninterest expense 2,757 6,957
Income tax (benefit) 11,155 1,715
Net income 39,846 10,368
Reclassification out of Accumulated Other Comprehensive Income [Member]    
Reclassification Adjustment out of AOCI [Abstract]    
Total reclassifications during the period, net of tax 368 421
Accumulated Net Unrealized Investment Gain (Loss) [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]    
Reclassification Adjustment out of AOCI [Abstract]    
Income tax (benefit) (35) (42)
Net income 107 128
Gains on AFS Securities [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]    
Reclassification Adjustment out of AOCI [Abstract]    
Net securities (gains) losses 0 (3)
Amortization of Unrealized Gains Related to Securities Transfer [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]    
Reclassification Adjustment out of AOCI [Abstract]    
Interest income (expense) 142 173
Net Unrealized Losses on Cash Flow Hedges Reclassified to Interest Expense [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]    
Reclassification Adjustment out of AOCI [Abstract]    
Interest income (expense) 21 10
Income tax (benefit) (5) (3)
Net income 16 7
Accumulated Defined Benefit Plans Adjustment [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]    
Reclassification Adjustment out of AOCI [Abstract]    
Income tax (benefit) (81) (95)
Net income 245 286
Amortization of Net Losses [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]    
Reclassification Adjustment out of AOCI [Abstract]    
Other noninterest expense 298 358
Amortization of Prior Service Costs [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]    
Reclassification Adjustment out of AOCI [Abstract]    
Other noninterest expense $ 28 $ 23