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Investment Securities - By Contractual Maturity (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Amortized Cost    
Due in One Year or Less $ 170,870  
Due after One Year through Five Years 330,075  
Due after Five Years through Ten Years 761,169  
Due after Ten Years 2,274,646  
Total 3,536,760 $ 1,338,260
Fair Value    
Due in One Year or Less 171,689  
Due after One Year through Five Years 338,789  
Due after Five Years through Ten Years 793,777  
Due after Ten Years 2,296,476  
Total 3,600,731 1,368,384
Amortized Cost    
Due in One Year or Less 0  
Due after One Year through Five Years 0  
Due after Five Years through Ten Years 0  
Due after Ten Years 27,980  
Amortized Cost 27,980 37,838
Fair Value    
Due in One Year or Less 0  
Due after One Year through Five Years 0  
Due after Five Years through Ten Years 0  
Due after Ten Years 29,399  
Total 29,399 38,760
Amortized Cost    
Due in One Year or Less 170,870  
Due after One Year through Five Years 330,075  
Due after Five Years through Ten Years 761,169  
Due after Ten Years 2,302,626  
Total 3,564,740  
Fair Value    
Due in One Year or Less 171,689  
Due after One Year through Five Years 338,789  
Due after Five Years through Ten Years 793,777  
Due after Ten Years 2,325,875  
Total 3,630,130  
U.S. Treasury    
Amortized Cost    
Due in One Year or Less 0  
Due after One Year through Five Years 30,161  
Due after Five Years through Ten Years 0  
Due after Ten Years 0  
Total 30,161 60,457
Fair Value    
Due in One Year or Less 0  
Due after One Year through Five Years 32,739  
Due after Five Years through Ten Years 0  
Due after Ten Years 0  
Total 32,739 63,555
Agency    
Amortized Cost    
Due in One Year or Less 1,000  
Due after One Year through Five Years 266,255  
Due after Five Years through Ten Years 234,070  
Due after Ten Years 76,302  
Total 577,627 240,348
Fair Value    
Due in One Year or Less 1,006  
Due after One Year through Five Years 272,144  
Due after Five Years through Ten Years 247,806  
Due after Ten Years 82,089  
Total 603,045 246,358
Corporate    
Amortized Cost    
Due in One Year or Less 159,949  
Due after One Year through Five Years 26,391  
Due after Five Years through Ten Years 156,824  
Due after Ten Years 54,506  
Total 397,670 149,150
Fair Value    
Due in One Year or Less 160,420  
Due after One Year through Five Years 26,363  
Due after Five Years through Ten Years 156,934  
Due after Ten Years 53,819  
Total 397,536 151,353
Municipal bonds    
Amortized Cost    
Due in One Year or Less 9,921  
Due after One Year through Five Years 1,458  
Due after Five Years through Ten Years 36,895  
Due after Ten Years 1,257,115  
Total 1,305,389 384,032
Fair Value    
Due in One Year or Less 10,263  
Due after One Year through Five Years 1,586  
Due after Five Years through Ten Years 39,849  
Due after Ten Years 1,262,210  
Total 1,313,908 397,298
Collateralized mortgage obligations    
Amortized Cost    
Due in One Year or Less 0  
Due after One Year through Five Years 3,620  
Due after Five Years through Ten Years 135,863  
Due after Ten Years 218,132  
Total 357,615 9,869
Fair Value    
Due in One Year or Less 0  
Due after One Year through Five Years 3,622  
Due after Five Years through Ten Years 136,445  
Due after Ten Years 218,213  
Total 358,280 9,984
Mortgage-backed securities    
Amortized Cost    
Due in One Year or Less 0  
Due after One Year through Five Years 2,190  
Due after Five Years through Ten Years 197,517  
Due after Ten Years 668,591  
Total 868,298 494,404
Fair Value    
Due in One Year or Less 0  
Due after One Year through Five Years 2,335  
Due after Five Years through Ten Years 212,743  
Due after Ten Years 680,145  
Total 895,223 499,836
Amortized Cost    
Due in One Year or Less 0  
Due after One Year through Five Years 0  
Due after Five Years through Ten Years 0  
Due after Ten Years 26,357  
Amortized Cost 26,357 36,114
Fair Value    
Due in One Year or Less 0  
Due after One Year through Five Years 0  
Due after Five Years through Ten Years 0  
Due after Ten Years 27,776  
Total 27,776 $ 37,036
Other    
Amortized Cost    
Due in One Year or Less 0  
Due after One Year through Five Years 0  
Due after Five Years through Ten Years 0  
Due after Ten Years 1,623  
Amortized Cost 1,623  
Fair Value    
Due in One Year or Less 0  
Due after One Year through Five Years 0  
Due after Five Years through Ten Years 0  
Due after Ten Years 1,623  
Total $ 1,623