XML 60 R49.htm IDEA: XBRL DOCUMENT v3.20.2
Investment Securities - Amortized Cost and Estimated Fair Value (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Investment securities available-for-sale:    
Total $ 3,536,760 $ 1,338,260
Gross Unrealized Gain 82,554 34,216
Gross Unrealized Loss (18,583) (4,092)
Estimated Fair Value 3,600,731 1,368,384
Investment securities held-to-maturity:    
Amortized Cost 27,980 37,838
Gross Unrealized Gain 1,419 922
Gross Unrealized Loss 0 0
Estimated Fair Value 29,399 38,760
Total investment securities    
Amortized Cost 3,564,740 1,376,098
Gross Unrealized Gain 83,973 35,138
Gross Unrealized Loss (18,583) (4,092)
Estimated Fair Value 3,630,130 1,407,144
U.S. Treasury    
Investment securities available-for-sale:    
Total 30,161 60,457
Gross Unrealized Gain 2,578 3,137
Gross Unrealized Loss 0 (39)
Estimated Fair Value 32,739 63,555
Agency    
Investment securities available-for-sale:    
Total 577,627 240,348
Gross Unrealized Gain 26,109 7,686
Gross Unrealized Loss (691) (1,676)
Estimated Fair Value 603,045 246,358
Corporate    
Investment securities available-for-sale:    
Total 397,670 149,150
Gross Unrealized Gain 2,035 2,217
Gross Unrealized Loss (2,169) (14)
Estimated Fair Value 397,536 151,353
Municipal bonds    
Investment securities available-for-sale:    
Total 1,305,389 384,032
Gross Unrealized Gain 23,581 13,450
Gross Unrealized Loss (15,062) (184)
Estimated Fair Value 1,313,908 397,298
Collateralized mortgage obligations    
Investment securities available-for-sale:    
Total 357,615 9,869
Gross Unrealized Gain 1,130 123
Gross Unrealized Loss (465) (8)
Estimated Fair Value 358,280 9,984
Mortgage-backed securities    
Investment securities available-for-sale:    
Total 868,298 494,404
Gross Unrealized Gain 27,121 7,603
Gross Unrealized Loss (196) (2,171)
Estimated Fair Value 895,223 499,836
Investment securities held-to-maturity:    
Amortized Cost 26,357 36,114
Gross Unrealized Gain 1,419 922
Gross Unrealized Loss 0 0
Estimated Fair Value 27,776 37,036
Other    
Investment securities held-to-maturity:    
Amortized Cost 1,623 1,724
Gross Unrealized Gain 0 0
Gross Unrealized Loss 0 0
Estimated Fair Value $ 1,623 $ 1,724