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Debt securities - General Disclosures (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2020
USD ($)
security
shares
Dec. 31, 2019
USD ($)
security
shares
Dec. 31, 2018
USD ($)
Debt Securities      
Equity securities consisting of common stock and money market mutual funds, fair value $ 5,530 $ 5,952  
Unrealized gains (losses) recognized on equity securities (393) (759) $ 2,162
Debt securities available for sale      
Amortized Cost 2,211,543 1,627,065  
Gross Unrealized Gains 50,317 22,021  
Gross Unrealized Losses (673) (829)  
Fair Value 2,261,187 1,648,257  
Debt securities available for sale, Amortized Cost      
Due in one year or less 121,208    
Due after one year through five years 239,021    
Due after five years through ten years 256,485    
Due after ten years 1,594,829    
Amortized Cost 2,211,543 1,627,065  
Debt securities available for sale, Fair Value      
Due in one year or less 122,213    
Due after one year through five years 247,833    
Due after five years through ten years 267,859    
Due after ten years 1,623,282    
Fair Value 2,261,187 1,648,257  
Realized gains and losses related to sales and calls of securities AFS      
Gross security gains 1,732 1,318  
Gross security (losses) (8) (585) (1,780)
Net gains (losses) on sales of securities 1,724 733 $ (1,780)
Debt securities available for sale, Fair Value      
Continuous unrealized losses existing for less than 12 months, gross 221,913 122,991  
Continuous unrealized losses existing for greater than 12 months, gross 5,096 53,851  
Total, gross 227,009 176,842  
Debt securities available for sale, Unrealized Losses      
Continuous unrealized losses existing for less than 12 months, gross (621) (448)  
Continuous unrealized losses existing greater than 12 months, gross (52) (381)  
Total, gross $ (673) $ (829)  
Debt security portfolio | shares 1,114 1,178  
Number of securities in unrealized loss position | security 23 55  
Securities in unrealized loss position as a percentage of aggregate carrying value of investments 0.30% 0.47%  
Collateral      
Realized gains and losses related to sales and calls of securities AFS      
Carrying amount of investment securities pledged as collateral $ 628,000 $ 704,700  
U.S. Treasury securities      
Debt securities available for sale      
Amortized Cost 27,481 51,472  
Gross Unrealized Gains 356 265  
Fair Value 27,837 51,737  
Debt securities available for sale, Amortized Cost      
Amortized Cost 27,481 51,472  
Debt securities available for sale, Fair Value      
Fair Value 27,837 51,737  
Obligations of U.S. government corporations and agencies      
Debt securities available for sale      
Amortized Cost 67,406 160,364  
Gross Unrealized Gains 2,162 2,684  
Gross Unrealized Losses (49) (48)  
Fair Value 69,519 163,000  
Debt securities available for sale, Amortized Cost      
Amortized Cost 67,406 160,364  
Debt securities available for sale, Fair Value      
Fair Value 69,519 163,000  
Debt securities available for sale, Fair Value      
Continuous unrealized losses existing for less than 12 months, gross   6,362  
Continuous unrealized losses existing for greater than 12 months, gross 4,957    
Total, gross 4,957 6,362  
Debt securities available for sale, Unrealized Losses      
Continuous unrealized losses existing for less than 12 months, gross   (48)  
Continuous unrealized losses existing greater than 12 months, gross (49)    
Total, gross (49) (48)  
Obligations of states and political subdivisions      
Debt securities available for sale      
Amortized Cost 292,940 262,492  
Gross Unrealized Gains 11,779 5,810  
Gross Unrealized Losses (8) (11)  
Fair Value 304,711 268,291  
Debt securities available for sale, Amortized Cost      
Amortized Cost 292,940 262,492  
Debt securities available for sale, Fair Value      
Fair Value 304,711 268,291  
Debt securities available for sale, Fair Value      
Continuous unrealized losses existing for less than 12 months, gross 762 4,981  
Continuous unrealized losses existing for greater than 12 months, gross   1,548  
Total, gross 762 6,529  
Debt securities available for sale, Unrealized Losses      
Continuous unrealized losses existing for less than 12 months, gross (8) (11)  
Total, gross (8) (11)  
Obligations of states and political subdivisions | Maximum      
Debt securities available for sale, Unrealized Losses      
Continuous unrealized losses existing greater than 12 months, gross   (1)  
Commercial mortgage-backed securities      
Debt securities available for sale      
Amortized Cost 408,716 137,733  
Gross Unrealized Gains 10,212 1,700  
Gross Unrealized Losses (312) (146)  
Fair Value 418,616 139,287  
Debt securities available for sale, Amortized Cost      
Amortized Cost 408,716 137,733  
Debt securities available for sale, Fair Value      
Fair Value 418,616 139,287  
Debt securities available for sale, Fair Value      
Continuous unrealized losses existing for less than 12 months, gross 129,655 33,322  
Continuous unrealized losses existing for greater than 12 months, gross   2,044  
Total, gross 129,655 35,366  
Debt securities available for sale, Unrealized Losses      
Continuous unrealized losses existing for less than 12 months, gross (312) (144)  
Continuous unrealized losses existing greater than 12 months, gross   (2)  
Total, gross (312) (146)  
Residential mortgage-backed securities      
Debt securities available for sale      
Amortized Cost 1,344,047 912,308  
Gross Unrealized Gains 24,571 10,282  
Gross Unrealized Losses (303) (624)  
Fair Value 1,368,315 921,966  
Debt securities available for sale, Amortized Cost      
Amortized Cost 1,344,047 912,308  
Debt securities available for sale, Fair Value      
Fair Value 1,368,315 921,966  
Debt securities available for sale, Fair Value      
Continuous unrealized losses existing for less than 12 months, gross 89,997 78,326  
Continuous unrealized losses existing for greater than 12 months, gross 139 50,259  
Total, gross 90,136 128,585  
Debt securities available for sale, Unrealized Losses      
Continuous unrealized losses existing for less than 12 months, gross (300) (245)  
Continuous unrealized losses existing greater than 12 months, gross (3) (379)  
Total, gross (303) (624)  
Corporate debt securities      
Debt securities available for sale      
Amortized Cost 70,953 102,696  
Gross Unrealized Gains 1,237 1,280  
Gross Unrealized Losses (1)    
Fair Value 72,189 103,976  
Debt securities available for sale, Amortized Cost      
Amortized Cost 70,953 102,696  
Debt securities available for sale, Fair Value      
Fair Value 72,189 $ 103,976  
Debt securities available for sale, Fair Value      
Continuous unrealized losses existing for less than 12 months, gross 1,499    
Total, gross 1,499    
Debt securities available for sale, Unrealized Losses      
Continuous unrealized losses existing for less than 12 months, gross (1)    
Total, gross $ (1)