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Securities - General Disclosures (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
USD ($)
security
shares
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
security
shares
Jun. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
security
shares
Debt securities available for sale          
Amortized Cost $ 3,447,504   $ 3,447,504   $ 2,211,543
Gross Unrealized Gains 36,293   36,293   50,317
Gross Unrealized Losses (19,280)   (19,280)   (673)
Fair Value 3,464,517   3,464,517   2,261,187
Debt securities available for sale, Amortized Cost          
Due in one year or less 122,809   122,809    
Due after one year through five years 573,422   573,422    
Due after five years through ten years 398,111   398,111    
Due after ten years 2,353,162   2,353,162    
Amortized Cost 3,447,504   3,447,504   2,211,543
Debt securities available for sale, Fair Value          
Due in one year or less 123,502   123,502    
Due after one year through five years 579,219   579,219    
Due after five years through ten years 407,150   407,150    
Due after ten years 2,354,646   2,354,646    
Fair Value 3,464,517   3,464,517   2,261,187
Realized gains and losses on sales of debt securities          
Gross security gains 499 $ 146 524 $ 1,707  
Gross security (losses) (405) (3) (405) (8)  
Net gains (losses) on sales of debt securities 94 $ 143 119 $ 1,699  
Debt securities available for sale, Fair Value          
Continuous unrealized losses existing for less than 12 months, gross 1,893,514   1,893,514   221,913
Continuous unrealized losses existing for greater than 12 months, gross 344   344   5,096
Total, gross 1,893,858   1,893,858   227,009
Debt securities available for sale, Unrealized Losses          
Continuous unrealized losses existing for less than 12 months, gross (19,276)   (19,276)   (621)
Continuous unrealized losses existing greater than 12 months, gross (4)   (4)   (52)
Total, gross $ (19,280)   $ (19,280)   $ (673)
Debt security portfolio | shares 1,249   1,249   1,114
Number of securities in unrealized loss position | security 252   252   23
Securities in unrealized loss position as a percentage of aggregate carrying value of investments 1.02%   1.02%   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 $ 703,100   $ 703,100   $ 628,000
U.S. Treasury securities          
Debt securities available for sale          
Amortized Cost 212,022   212,022   27,481
Gross Unrealized Gains 150   150   356
Gross Unrealized Losses (279)   (279)    
Fair Value 211,893   211,893   27,837
Debt securities available for sale, Amortized Cost          
Amortized Cost 212,022   212,022   27,481
Debt securities available for sale, Fair Value          
Fair Value 211,893   211,893   27,837
Debt securities available for sale, Fair Value          
Continuous unrealized losses existing for less than 12 months, gross 150,811   150,811    
Total, gross 150,811   150,811    
Debt securities available for sale, Unrealized Losses          
Continuous unrealized losses existing for less than 12 months, gross (279)   (279)    
Total, gross (279)   (279)    
Obligations of U.S. government corporations and agencies          
Debt securities available for sale          
Amortized Cost 49,528   49,528   67,406
Gross Unrealized Gains 1,470   1,470   2,162
Gross Unrealized Losses         (49)
Fair Value 50,998   50,998   69,519
Debt securities available for sale, Amortized Cost          
Amortized Cost 49,528   49,528   67,406
Debt securities available for sale, Fair Value          
Fair Value 50,998   50,998   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 292,221   292,221   292,940
Gross Unrealized Gains 9,634   9,634   11,779
Gross Unrealized Losses (513)   (513)   (8)
Fair Value 301,342   301,342   304,711
Debt securities available for sale, Amortized Cost          
Amortized Cost 292,221   292,221   292,940
Debt securities available for sale, Fair Value          
Fair Value 301,342   301,342   304,711
Debt securities available for sale, Fair Value          
Continuous unrealized losses existing for less than 12 months, gross 48,579   48,579   762
Total, gross 48,579   48,579   762
Debt securities available for sale, Unrealized Losses          
Continuous unrealized losses existing for less than 12 months, gross (513)   (513)   (8)
Total, gross (513)   (513)   (8)
Commercial mortgage-backed securities          
Debt securities available for sale          
Amortized Cost 513,067   513,067   408,716
Gross Unrealized Gains 6,528   6,528   10,212
Gross Unrealized Losses (5,543)   (5,543)   (312)
Fair Value 514,052   514,052   418,616
Debt securities available for sale, Amortized Cost          
Amortized Cost 513,067   513,067   408,716
Debt securities available for sale, Fair Value          
Fair Value 514,052   514,052   418,616
Debt securities available for sale, Fair Value          
Continuous unrealized losses existing for less than 12 months, gross 322,082   322,082   129,655
Total, gross 322,082   322,082   129,655
Debt securities available for sale, Unrealized Losses          
Continuous unrealized losses existing for less than 12 months, gross (5,543)   (5,543)   (312)
Total, gross (5,543)   (5,543)   (312)
Residential mortgage-backed securities          
Debt securities available for sale          
Amortized Cost 1,837,271   1,837,271   1,344,047
Gross Unrealized Gains 16,875   16,875   24,571
Gross Unrealized Losses (11,952)   (11,952)   (303)
Fair Value 1,842,194   1,842,194   1,368,315
Debt securities available for sale, Amortized Cost          
Amortized Cost 1,837,271   1,837,271   1,344,047
Debt securities available for sale, Fair Value          
Fair Value 1,842,194   1,842,194   1,368,315
Debt securities available for sale, Fair Value          
Continuous unrealized losses existing for less than 12 months, gross 1,073,263   1,073,263   89,997
Continuous unrealized losses existing for greater than 12 months, gross 344   344   139
Total, gross 1,073,607   1,073,607   90,136
Debt securities available for sale, Unrealized Losses          
Continuous unrealized losses existing for less than 12 months, gross (11,948)   (11,948)   (300)
Continuous unrealized losses existing greater than 12 months, gross (4)   (4)   (3)
Total, gross (11,952)   (11,952)   (303)
Asset-backed securities          
Debt securities available for sale          
Amortized Cost 246,998   246,998    
Gross Unrealized Gains 179   179    
Gross Unrealized Losses (180)   (180)    
Fair Value 246,997   246,997    
Debt securities available for sale, Amortized Cost          
Amortized Cost 246,998   246,998    
Debt securities available for sale, Fair Value          
Fair Value 246,997   246,997    
Debt securities available for sale, Fair Value          
Continuous unrealized losses existing for less than 12 months, gross 98,703   98,703    
Total, gross 98,703   98,703    
Debt securities available for sale, Unrealized Losses          
Continuous unrealized losses existing for less than 12 months, gross (180)   (180)    
Total, gross (180)   (180)    
Corporate debt securities          
Debt securities available for sale          
Amortized Cost 296,397   296,397   70,953
Gross Unrealized Gains 1,457   1,457   1,237
Gross Unrealized Losses (813)   (813)   (1)
Fair Value 297,041   297,041   72,189
Debt securities available for sale, Amortized Cost          
Amortized Cost 296,397   296,397   70,953
Debt securities available for sale, Fair Value          
Fair Value 297,041   297,041   72,189
Debt securities available for sale, Fair Value          
Continuous unrealized losses existing for less than 12 months, gross 200,076   200,076   1,499
Total, gross 200,076   200,076   1,499
Debt securities available for sale, Unrealized Losses          
Continuous unrealized losses existing for less than 12 months, gross (813)   (813)   (1)
Total, gross $ (813)   $ (813)   $ (1)