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Investment Securities - Amortized cost and fair value for available for sale securities (Details) - USD ($)
3 Months Ended 6 Months Ended
Mar. 31, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
investment securities held-to-maturity          
Amortized cost     $ 2,806,465,000   $ 1,819,901,000
Gross Unrealized Gains         318,000
Gross Unrealized Losses     (313,779,000)   (42,155,000)
Fair Value     2,492,686,000   1,778,064,000
Investment securities available for sale          
Amortized cost     6,317,123,000   5,221,296,000
Gross Unrealized Gains     4,393,000   35,980,000
Gross Unrealized Losses     (655,508,000)   (63,798,000)
Fair Value     5,666,008,000   5,193,478,000
Realized gains or losses $ 0   0 $ 36,000  
Gross realized gains   $ 69,000      
Gross realized losses       $ 33,000  
Atlantic Capital          
Investment securities available for sale          
Sold securities $ 414,400,000        
U.S. Treasuries          
Investment securities available for sale          
Amortized cost     320,391,000    
Gross Unrealized Gains     357,000    
Gross Unrealized Losses     (4,290,000)    
Fair Value     316,458,000    
U.S. Government agencies          
investment securities held-to-maturity          
Amortized cost     197,260,000   112,913,000
Gross Unrealized Losses     (19,001,000)   (2,627,000)
Fair Value     178,259,000   110,286,000
Investment securities available for sale          
Amortized cost     220,916,000   98,882,000
Gross Unrealized Losses     (17,829,000)   (1,765,000)
Fair Value     203,087,000   97,117,000
Residential mortgage-backed securities issued by U.S. government agencies or sponsored enterprises          
investment securities held-to-maturity          
Amortized cost     1,685,694,000   1,120,104,000
Gross Unrealized Gains         14,000
Gross Unrealized Losses     (191,302,000)   (24,278,000)
Fair Value     1,494,392,000   1,095,840,000
Investment securities available for sale          
Amortized cost     2,080,637,000   1,851,700,000
Gross Unrealized Gains     2,000   5,324,000
Gross Unrealized Losses     (220,630,000)   (25,985,000)
Fair Value     1,860,009,000   1,831,039,000
Residential collateralized mortgage-obligations issued by U.S. government agencies or sponsored enterprises          
investment securities held-to-maturity          
Amortized cost     494,330,000   174,178,000
Gross Unrealized Losses     (41,685,000)   (4,937,000)
Fair Value     452,645,000   169,241,000
Investment securities available for sale          
Amortized cost     732,616,000   730,949,000
Gross Unrealized Gains     2,000   5,957,000
Gross Unrealized Losses     (65,104,000)   (10,911,000)
Fair Value     667,514,000   725,995,000
Commercial mortgage-backed securities issued by U.S. government agencies or sponsored enterprises          
investment securities held-to-maturity          
Amortized cost     369,975,000   350,116,000
Gross Unrealized Gains         304,000
Gross Unrealized Losses     (53,121,000)   (8,021,000)
Fair Value     316,854,000   342,399,000
Investment securities available for sale          
Amortized cost     1,207,129,000   1,220,233,000
Gross Unrealized Gains     2,586,000   5,438,000
Gross Unrealized Losses     (143,893,000)   (18,430,000)
Fair Value     1,065,822,000   1,207,241,000
State and municipal obligations          
Investment securities available for sale          
Amortized cost     1,239,072,000   798,211,000
Gross Unrealized Gains     622,000   16,697,000
Gross Unrealized Losses     (171,136,000)   (2,219,000)
Fair Value     1,068,558,000   812,689,000
Small Business Administration loan-backed securities          
investment securities held-to-maturity          
Amortized cost     59,206,000   62,590,000
Gross Unrealized Losses     (8,670,000)   (2,292,000)
Fair Value     50,536,000   60,298,000
Investment securities available for sale          
Amortized cost     485,755,000   502,812,000
Gross Unrealized Gains     813,000   2,330,000
Gross Unrealized Losses     (31,616,000)   (4,479,000)
Fair Value     454,952,000   500,663,000
Corporate securities.          
Investment securities available for sale          
Amortized cost     30,607,000   18,509,000
Gross Unrealized Gains     11,000   234,000
Gross Unrealized Losses     (1,010,000)   (9,000)
Fair Value     $ 29,608,000   $ 18,734,000