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Securities - Amortized Cost and Estimated Fair Value of Securities Available-for-Sale and Held-to-Maturity (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Mar. 31, 2021
Dec. 31, 2020
Securities Financing Transaction [Line Items]        
Available-for-sale, amortized cost $ 564,478 $ 569,874    
Available-for-sale, gross unrealized gains 206 1,275    
Available-for-sale, gross unrealized losses (18,214) (2,894)    
Available-for-sale, fair value 546,470 568,255    
Allowance for Credit Losses 0 0    
Amortized Cost 1,103,628 1,143,548    
Held-to-maturity, gross unrealized gains 1,786 18,967    
Held-to-maturity, gross unrealized losses (54,522) (9,771)    
Debt securities held-to-maturity 1,050,892 1,152,744    
Allowance for Credit Losses (1,380) (1,467) $ (1,717) $ (1,715)
Total, amortized cost 1,668,106 1,713,422    
Total, gross unrealized gains 1,992 20,242    
Total, gross unrealized losses (72,736) (12,665)    
Total, estimated fair value 1,597,362 1,720,999    
U.S. government and agency obligations | Investment securities        
Securities Financing Transaction [Line Items]        
Available-for-sale, amortized cost 145,690 164,756    
Available-for-sale, gross unrealized gains 206 1,135    
Available-for-sale, gross unrealized losses (3,855) (471)    
Available-for-sale, fair value 142,041 165,420    
Allowance for Credit Losses 0 0    
Corporate debt securities        
Securities Financing Transaction [Line Items]        
Available-for-sale, amortized cost 63,100      
Available-for-sale, fair value 61,800      
Corporate debt securities | Investment securities        
Securities Financing Transaction [Line Items]        
Available-for-sale, amortized cost 5,000 5,000    
Available-for-sale, gross unrealized gains 0 42    
Available-for-sale, gross unrealized losses (216) (11)    
Available-for-sale, fair value 4,784 5,031    
Allowance for Credit Losses 0 0    
Amortized Cost 64,198 68,823    
Held-to-maturity, gross unrealized gains 917 1,628    
Held-to-maturity, gross unrealized losses (1,951) (1,279)    
Debt securities held-to-maturity 63,164 69,172    
Allowance for Credit Losses (1,272) (1,343)    
Asset-backed securities        
Securities Financing Transaction [Line Items]        
Available-for-sale, amortized cost 303,400      
Asset-backed securities | Investment securities        
Securities Financing Transaction [Line Items]        
Available-for-sale, amortized cost 302,389 298,976    
Available-for-sale, gross unrealized gains 0 41    
Available-for-sale, gross unrealized losses (5,300) (1,489)    
Available-for-sale, fair value 297,089 297,528    
Allowance for Credit Losses 0 0    
State, municipal and sovereign debt obligations        
Securities Financing Transaction [Line Items]        
Available-for-sale, amortized cost 87,600      
Available-for-sale, fair value 85,400      
State, municipal and sovereign debt obligations | Investment securities        
Securities Financing Transaction [Line Items]        
Amortized Cost 272,250 281,389    
Held-to-maturity, gross unrealized gains 396 10,185    
Held-to-maturity, gross unrealized losses (12,673) (1,164)    
Debt securities held-to-maturity 259,973 290,410    
Allowance for Credit Losses (69) (85)    
Mortgage-backed securities:        
Securities Financing Transaction [Line Items]        
Amortized Cost 767,180 793,336    
Held-to-maturity, gross unrealized gains 473 7,154    
Held-to-maturity, gross unrealized losses (39,898) (7,328)    
Debt securities held-to-maturity 727,755 793,162    
Allowance for Credit Losses (39) (39)    
Mortgage-backed securities: | Agency residential        
Securities Financing Transaction [Line Items]        
Amortized Cost 730,960 756,844    
Held-to-maturity, gross unrealized gains 467 6,785    
Held-to-maturity, gross unrealized losses (38,828) (7,180)    
Debt securities held-to-maturity 692,599 756,449    
Allowance for Credit Losses 0 0    
Mortgage-backed securities: | Agency commercial        
Securities Financing Transaction [Line Items]        
Available-for-sale, amortized cost 111,399 101,142    
Available-for-sale, gross unrealized gains 0 57    
Available-for-sale, gross unrealized losses (8,843) (923)    
Available-for-sale, fair value 102,556 100,276    
Allowance for Credit Losses 0 0    
Amortized Cost 4,163 4,385    
Held-to-maturity, gross unrealized gains 3 7    
Held-to-maturity, gross unrealized losses (45) (44)    
Debt securities held-to-maturity 4,121 4,348    
Allowance for Credit Losses 0 0    
Mortgage-backed securities: | Non-agency commercial        
Securities Financing Transaction [Line Items]        
Amortized Cost 32,057 32,107    
Held-to-maturity, gross unrealized gains 3 362    
Held-to-maturity, gross unrealized losses (1,025) (104)    
Debt securities held-to-maturity 31,035 32,365    
Allowance for Credit Losses $ (39) $ (39)