XML 42 R31.htm IDEA: XBRL DOCUMENT v3.22.2
Investment Securities - Summary (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Available-for-sale debt securities:    
Total $ 2,814,241 $ 3,598,600
Gross Unrealized Gains 995 9,563
Gross Unrealized Losses (279,590) (69,962)
Estimated Fair Value 2,535,646 3,538,201
Held-to-maturity debt securities:    
Amortized Cost(1) 980,935 0
Gross Unrealized Gains 0  
Gross Unrealized Losses 81,688  
Estimated Fair Value 899,247  
Equity securities 36,118 45,607
Total investment securities 3,552,699 3,583,808
Interest receivable 57,600 50,900
Available-for-sale    
Available-for-sale debt securities:    
Total 2,814,241  
Estimated Fair Value 2,535,646  
Held-to-maturity debt securities:    
Interest receivable 5,200 6,600
Held-to-maturity    
Held-to-maturity debt securities:    
Estimated Fair Value 899,247  
Interest receivable 1,600  
U.S. Treasury securities    
Available-for-sale debt securities:    
Total 638,427  
Gross Unrealized Gains 974  
Gross Unrealized Losses (13,598)  
Estimated Fair Value 625,803  
U.S. government agency securities    
Available-for-sale debt securities:    
Total 125,000 125,000
Gross Unrealized Gains 0 0
Gross Unrealized Losses (16,382) (4,056)
Estimated Fair Value 108,618 120,944
Residential mortgage-backed securities    
Available-for-sale debt securities:    
Total 2,036,101 3,288,261
Gross Unrealized Gains 21 156
Gross Unrealized Losses (246,567) (63,039)
Estimated Fair Value 1,789,555 3,225,378
Held-to-maturity debt securities:    
Amortized Cost(1) 980,935  
Gross Unrealized Gains 0  
Gross Unrealized Losses 81,688  
Estimated Fair Value 899,247  
Tax-exempt asset-backed securities    
Available-for-sale debt securities:    
Total   170,626
Gross Unrealized Gains   9,407
Gross Unrealized Losses   0
Estimated Fair Value   180,033
Credit risk transfer (“CRT”) securities    
Available-for-sale debt securities:    
Total 14,713 14,713
Gross Unrealized Gains 0 0
Gross Unrealized Losses (3,043) (2,867)
Estimated Fair Value $ 11,670 $ 11,846