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Debt Securities - General Disclosures (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2021
USD ($)
security
shares
Dec. 31, 2020
USD ($)
security
shares
Dec. 31, 2019
USD ($)
Debt securities available for sale      
Amortized Cost $ 4,013,523 $ 2,211,543  
Gross Unrealized Gains 22,382 50,317  
Gross Unrealized Losses (54,654) (673)  
Fair Value 3,981,251 2,261,187  
Debt securities available for sale, Amortized Cost      
Due in one year or less 129,260    
Due after one year through five years 564,284    
Due after five years through ten years 356,782    
Due after ten years 2,963,197    
Amortized Cost 4,013,523 2,211,543  
Debt securities available for sale, Fair Value      
Due in one year or less 129,848    
Due after one year through five years 563,473    
Due after five years through ten years 362,057    
Due after ten years 2,925,873    
Fair Value 3,981,251 2,261,187  
Realized gains and losses on sales of debt securities      
Gross security gains 543 1,732 $ 1,318
Gross security (losses) (514) (8) (585)
Net gains (losses) on sales of debt securities 29 1,724 $ 733
Debt securities available for sale, Fair Value      
Continuous unrealized losses existing for less than 12 months, gross 2,676,734 221,913  
Continuous unrealized losses existing for greater than 12 months, gross 106,443 5,096  
Total, gross 2,783,177 227,009  
Debt securities available for sale, Unrealized Losses      
Continuous unrealized losses existing for less than 12 months, gross (49,847) (621)  
Continuous unrealized losses existing greater than 12 months, gross (4,807) (52)  
Total, gross $ (54,654) $ (673)  
Debt security portfolio | shares 1,252 1,114  
Number of securities in unrealized loss position | security 373 23  
Securities in unrealized loss position as a percentage of aggregate carrying value of investments 1.40% 0.03%  
Collateral      
Realized gains and losses on sales of debt securities      
Carrying amount of debt securities pledged as collateral for public deposits, securities sold under agreements to repurchase and for other purposes $ 708,900 $ 628,000  
U.S. Treasury securities      
Debt securities available for sale      
Amortized Cost 166,768 27,481  
Gross Unrealized Gains 41 356  
Gross Unrealized Losses (1,047)    
Fair Value 165,762 27,837  
Debt securities available for sale, Amortized Cost      
Amortized Cost 166,768 27,481  
Debt securities available for sale, Fair Value      
Fair Value 165,762 27,837  
Debt securities available for sale, Fair Value      
Continuous unrealized losses existing for less than 12 months, gross 163,653    
Total, gross 163,653    
Debt securities available for sale, Unrealized Losses      
Continuous unrealized losses existing for less than 12 months, gross (1,047)    
Total, gross (1,047)    
Obligations of U.S. government corporations and agencies      
Debt securities available for sale      
Amortized Cost 37,579 67,406  
Gross Unrealized Gains 891 2,162  
Gross Unrealized Losses   (49)  
Fair Value 38,470 69,519  
Debt securities available for sale, Amortized Cost      
Amortized Cost 37,579 67,406  
Debt securities available for sale, Fair Value      
Fair Value 38,470 69,519  
Debt securities available for sale, Fair Value      
Continuous unrealized losses existing for greater than 12 months, gross   4,957  
Total, gross   4,957  
Debt securities available for sale, Unrealized Losses      
Continuous unrealized losses existing greater than 12 months, gross   (49)  
Total, gross   (49)  
Obligations of states and political subdivisions      
Debt securities available for sale      
Amortized Cost 300,602 292,940  
Gross Unrealized Gains 7,760 11,779  
Gross Unrealized Losses (1,493) (8)  
Fair Value 306,869 304,711  
Debt securities available for sale, Amortized Cost      
Amortized Cost 300,602 292,940  
Debt securities available for sale, Fair Value      
Fair Value 306,869 304,711  
Debt securities available for sale, Fair Value      
Continuous unrealized losses existing for less than 12 months, gross 92,680 762  
Total, gross 92,680 762  
Debt securities available for sale, Unrealized Losses      
Continuous unrealized losses existing for less than 12 months, gross (1,493) (8)  
Total, gross (1,493) (8)  
Commercial mortgage-backed securities      
Debt securities available for sale      
Amortized Cost 625,339 408,716  
Gross Unrealized Gains 3,425 10,212  
Gross Unrealized Losses (13,766) (312)  
Fair Value 614,998 418,616  
Debt securities available for sale, Amortized Cost      
Amortized Cost 625,339 408,716  
Debt securities available for sale, Fair Value      
Fair Value 614,998 418,616  
Debt securities available for sale, Fair Value      
Continuous unrealized losses existing for less than 12 months, gross 389,078 129,655  
Continuous unrealized losses existing for greater than 12 months, gross 85,905    
Total, gross 474,983 129,655  
Debt securities available for sale, Unrealized Losses      
Continuous unrealized losses existing for less than 12 months, gross (10,186) (312)  
Continuous unrealized losses existing greater than 12 months, gross (3,580)    
Total, gross (13,766) (312)  
Residential mortgage-backed securities      
Debt securities available for sale      
Amortized Cost 2,095,104 1,344,047  
Gross Unrealized Gains 8,889 24,571  
Gross Unrealized Losses (34,680) (303)  
Fair Value 2,069,313 1,368,315  
Debt securities available for sale, Amortized Cost      
Amortized Cost 2,095,104 1,344,047  
Debt securities available for sale, Fair Value      
Fair Value 2,069,313 1,368,315  
Debt securities available for sale, Fair Value      
Continuous unrealized losses existing for less than 12 months, gross 1,700,187 89,997  
Continuous unrealized losses existing for greater than 12 months, gross 20,538 139  
Total, gross 1,720,725 90,136  
Debt securities available for sale, Unrealized Losses      
Continuous unrealized losses existing for less than 12 months, gross (33,453) (300)  
Continuous unrealized losses existing greater than 12 months, gross (1,227) (3)  
Total, gross (34,680) (303)  
Asset-backed securities      
Debt securities available for sale      
Amortized Cost 492,055    
Gross Unrealized Gains 295    
Gross Unrealized Losses (164)    
Fair Value 492,186    
Debt securities available for sale, Amortized Cost      
Amortized Cost 492,055    
Debt securities available for sale, Fair Value      
Fair Value 492,186    
Debt securities available for sale, Fair Value      
Continuous unrealized losses existing for less than 12 months, gross 89,983    
Total, gross 89,983    
Debt securities available for sale, Unrealized Losses      
Continuous unrealized losses existing for less than 12 months, gross (164)    
Total, gross (164)    
Corporate debt securities      
Debt securities available for sale      
Amortized Cost 296,076 70,953  
Gross Unrealized Gains 1,081 1,237  
Gross Unrealized Losses (3,504) (1)  
Fair Value 293,653 72,189  
Debt securities available for sale, Amortized Cost      
Amortized Cost 296,076 70,953  
Debt securities available for sale, Fair Value      
Fair Value 293,653 72,189  
Debt securities available for sale, Fair Value      
Continuous unrealized losses existing for less than 12 months, gross 241,153 1,499  
Total, gross 241,153 1,499  
Debt securities available for sale, Unrealized Losses      
Continuous unrealized losses existing for less than 12 months, gross (3,504) (1)  
Total, gross $ (3,504) $ (1)