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Securities - Amortized Cost and Fair Value, Held to Maturity (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost $ 1,245,627 $ 1,324,072
Gross Unrealized Gains 0 17
Gross Unrealized Losses (166,504) (117,549)
Fair Value 1,079,123 1,206,540
Allowance for credit losses - held to maturity securities (32) (32)
Held to maturity securities, net of allowance for credit losses 1,245,595 1,324,040
Obligations of states and political subdivisions    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 289,053 291,886
Gross Unrealized Gains 0 17
Gross Unrealized Losses (57,660) (48,325)
Fair Value 231,393 243,578
Residential mortgage backed securities:    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 395,441 423,315
Gross Unrealized Gains 0 0
Gross Unrealized Losses (49,030) (30,706)
Fair Value 346,411 392,609
Residential mortgage backed securities: | Government agency mortgage backed securities    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 440,227 483,560
Gross Unrealized Gains 0 0
Gross Unrealized Losses (41,350) (24,432)
Fair Value 398,877 459,128
Commercial mortgage backed securities: | Government agency mortgage backed securities    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 16,989 17,006
Gross Unrealized Gains 0 0
Gross Unrealized Losses (3,800) (3,261)
Fair Value 13,189 13,745
Commercial mortgage backed securities: | Government agency collateralized mortgage obligations    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 44,725 45,430
Gross Unrealized Gains 0 0
Gross Unrealized Losses (8,235) (6,559)
Fair Value 36,490 38,871
Other debt securities    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 59,192 62,875
Gross Unrealized Gains 0 0
Gross Unrealized Losses (6,429) (4,266)
Fair Value $ 52,763 $ 58,609