XML 56 R45.htm IDEA: XBRL DOCUMENT v3.21.2
Securities - General Disclosures (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
USD ($)
security
shares
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
security
shares
Sep. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
security
shares
Debt securities available for sale          
Amortized Cost $ 3,997,424   $ 3,997,424   $ 2,211,543
Gross Unrealized Gains 30,976   30,976   50,317
Gross Unrealized Losses (31,156)   (31,156)   (673)
Fair Value 3,997,244   3,997,244   2,261,187
Debt securities available for sale, Amortized Cost          
Due in one year or less 103,158   103,158    
Due after one year through five years 603,868   603,868    
Due after five years through ten years 385,479   385,479    
Due after ten years 2,904,919   2,904,919    
Amortized Cost 3,997,424   3,997,424   2,211,543
Debt securities available for sale, Fair Value          
Due in one year or less 103,787   103,787    
Due after one year through five years 608,074   608,074    
Due after five years through ten years 393,540   393,540    
Due after ten years 2,891,843   2,891,843    
Fair Value 3,997,244   3,997,244   2,261,187
Realized gains and losses on sales of debt securities          
Gross security gains   $ 11 524 $ 1,718  
Gross security (losses) (5)   (410) (8)  
Net gains (losses) on sales of debt securities (5) $ 11 114 $ 1,710  
Debt securities available for sale, Fair Value          
Continuous unrealized losses existing for less than 12 months, gross 2,324,265   2,324,265   221,913
Continuous unrealized losses existing for greater than 12 months, gross 8,631   8,631   5,096
Total, gross 2,332,896   2,332,896   227,009
Debt securities available for sale, Unrealized Losses          
Continuous unrealized losses existing for less than 12 months, gross (31,068)   (31,068)   (621)
Continuous unrealized losses existing greater than 12 months, gross (88)   (88)   (52)
Total, gross $ (31,156)   $ (31,156)   $ (673)
Debt security portfolio | shares 1,274   1,274   1,114
Number of securities in unrealized loss position | security 294   294   23
Securities in unrealized loss position as a percentage of aggregate carrying value of investments 1.30%   1.30%   0.30%
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 $ 729,200   $ 729,200   $ 628,000
U.S. Treasury securities          
Debt securities available for sale          
Amortized Cost 185,636   185,636   27,481
Gross Unrealized Gains 72   72   356
Gross Unrealized Losses (255)   (255)    
Fair Value 185,453   185,453   27,837
Debt securities available for sale, Amortized Cost          
Amortized Cost 185,636   185,636   27,481
Debt securities available for sale, Fair Value          
Fair Value 185,453   185,453   27,837
Debt securities available for sale, Fair Value          
Continuous unrealized losses existing for less than 12 months, gross 180,317   180,317    
Total, gross 180,317   180,317    
Debt securities available for sale, Unrealized Losses          
Continuous unrealized losses existing for less than 12 months, gross (255)   (255)    
Total, gross (255)   (255)    
Obligations of U.S. government corporations and agencies          
Debt securities available for sale          
Amortized Cost 37,784   37,784   67,406
Gross Unrealized Gains 1,213   1,213   2,162
Gross Unrealized Losses         (49)
Fair Value 38,997   38,997   69,519
Debt securities available for sale, Amortized Cost          
Amortized Cost 37,784   37,784   67,406
Debt securities available for sale, Fair Value          
Fair Value 38,997   38,997   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 288,023   288,023   292,940
Gross Unrealized Gains 8,743   8,743   11,779
Gross Unrealized Losses (754)   (754)   (8)
Fair Value 296,012   296,012   304,711
Debt securities available for sale, Amortized Cost          
Amortized Cost 288,023   288,023   292,940
Debt securities available for sale, Fair Value          
Fair Value 296,012   296,012   304,711
Debt securities available for sale, Fair Value          
Continuous unrealized losses existing for less than 12 months, gross 55,434   55,434   762
Total, gross 55,434   55,434   762
Debt securities available for sale, Unrealized Losses          
Continuous unrealized losses existing for less than 12 months, gross (754)   (754)   (8)
Total, gross (754)   (754)   (8)
Commercial mortgage-backed securities          
Debt securities available for sale          
Amortized Cost 607,097   607,097   408,716
Gross Unrealized Gains 5,278   5,278   10,212
Gross Unrealized Losses (9,078)   (9,078)   (312)
Fair Value 603,297   603,297   418,616
Debt securities available for sale, Amortized Cost          
Amortized Cost 607,097   607,097   408,716
Debt securities available for sale, Fair Value          
Fair Value 603,297   603,297   418,616
Debt securities available for sale, Fair Value          
Continuous unrealized losses existing for less than 12 months, gross 434,220   434,220   129,655
Continuous unrealized losses existing for greater than 12 months, gross 3,063   3,063    
Total, gross 437,283   437,283   129,655
Debt securities available for sale, Unrealized Losses          
Continuous unrealized losses existing for less than 12 months, gross (9,036)   (9,036)   (312)
Continuous unrealized losses existing greater than 12 months, gross (42)   (42)    
Total, gross (9,078)   (9,078)   (312)
Residential mortgage-backed securities          
Debt securities available for sale          
Amortized Cost 2,108,388   2,108,388   1,344,047
Gross Unrealized Gains 13,973   13,973   24,571
Gross Unrealized Losses (19,753)   (19,753)   (303)
Fair Value 2,102,608   2,102,608   1,368,315
Debt securities available for sale, Amortized Cost          
Amortized Cost 2,108,388   2,108,388   1,344,047
Debt securities available for sale, Fair Value          
Fair Value 2,102,608   2,102,608   1,368,315
Debt securities available for sale, Fair Value          
Continuous unrealized losses existing for less than 12 months, gross 1,392,160   1,392,160   89,997
Continuous unrealized losses existing for greater than 12 months, gross 5,568   5,568   139
Total, gross 1,397,728   1,397,728   90,136
Debt securities available for sale, Unrealized Losses          
Continuous unrealized losses existing for less than 12 months, gross (19,707)   (19,707)   (300)
Continuous unrealized losses existing greater than 12 months, gross (46)   (46)   (3)
Total, gross (19,753)   (19,753)   (303)
Asset-backed securities          
Debt securities available for sale          
Amortized Cost 468,618   468,618    
Gross Unrealized Gains 323   323    
Gross Unrealized Losses (134)   (134)    
Fair Value 468,807   468,807    
Debt securities available for sale, Amortized Cost          
Amortized Cost 468,618   468,618    
Debt securities available for sale, Fair Value          
Fair Value 468,807   468,807    
Debt securities available for sale, Fair Value          
Continuous unrealized losses existing for less than 12 months, gross 51,183   51,183    
Total, gross 51,183   51,183    
Debt securities available for sale, Unrealized Losses          
Continuous unrealized losses existing for less than 12 months, gross (134)   (134)    
Total, gross (134)   (134)    
Corporate debt securities          
Debt securities available for sale          
Amortized Cost 301,878   301,878   70,953
Gross Unrealized Gains 1,374   1,374   1,237
Gross Unrealized Losses (1,182)   (1,182)   (1)
Fair Value 302,070   302,070   72,189
Debt securities available for sale, Amortized Cost          
Amortized Cost 301,878   301,878   70,953
Debt securities available for sale, Fair Value          
Fair Value 302,070   302,070   72,189
Debt securities available for sale, Fair Value          
Continuous unrealized losses existing for less than 12 months, gross 210,951   210,951   1,499
Total, gross 210,951   210,951   1,499
Debt securities available for sale, Unrealized Losses          
Continuous unrealized losses existing for less than 12 months, gross (1,182)   (1,182)   (1)
Total, gross $ (1,182)   $ (1,182)   $ (1)