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Securities - Amortized Cost and Estimated Fair Value of Securities Available-for-Sale and Held-to-Maturity (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Jun. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
Securities Financing Transaction [Line Items]            
Amortized Cost $ 313,575   $ 180,154      
Available-for-sale, gross unrealized gains 1,714   3,154      
Available-for-sale, gross unrealized losses (669)   (6)      
Debt securities available-for-sale, at estimated fair value 314,620   183,302      
Allowance for Credit Losses 0   0      
Amortized Cost 1,129,719   942,314      
Held-to-maturity, gross unrealized gains 20,490   29,378      
Held-to-maturity, gross unrealized losses (6,828)   (3,226)      
Securities held-to-maturity, estimated fair value 1,143,381   968,466      
Allowance for Credit Losses (1,503) $ (1,609) (1,715) $ (2,393) $ (2,446) $ 0
Total, amortized cost 1,443,294   1,122,468      
Total, gross unrealized gains 22,204   32,532      
Total, gross unrealized losses (7,497)   (3,232)      
Total, estimated fair value 1,458,001   1,151,768      
U.S. government and agency obligations | Securities Investment            
Securities Financing Transaction [Line Items]            
Amortized Cost 133,088   173,790      
Available-for-sale, gross unrealized gains 1,653   3,152      
Available-for-sale, gross unrealized losses (136)   (2)      
Debt securities available-for-sale, at estimated fair value 134,605   176,940      
Allowance for Credit Losses 0   0      
Corporate debt securities | Securities Investment            
Securities Financing Transaction [Line Items]            
Amortized Cost 5,000          
Available-for-sale, gross unrealized gains 52          
Available-for-sale, gross unrealized losses (3)          
Debt securities available-for-sale, at estimated fair value 5,049          
Allowance for Credit Losses 0          
Amortized Cost 70,343   72,305      
Held-to-maturity, gross unrealized gains 1,828   1,615      
Held-to-maturity, gross unrealized losses (1,273)   (2,652)      
Securities held-to-maturity, estimated fair value 70,898   71,268      
Allowance for Credit Losses (1,309)   (1,550)      
Collateralized loan obligations (“CLOs”) | Securities Investment            
Securities Financing Transaction [Line Items]            
Amortized Cost 145,792   6,174      
Available-for-sale, gross unrealized gains 8   0      
Available-for-sale, gross unrealized losses (380)   (4)      
Debt securities available-for-sale, at estimated fair value 145,420   6,170      
Allowance for Credit Losses 0   0      
State, municipal and sovereign debt obligations | Securities Investment            
Securities Financing Transaction [Line Items]            
Amortized Cost 292,226   238,405      
Held-to-maturity, gross unrealized gains 8,379   11,500      
Held-to-maturity, gross unrealized losses (630)   (231)      
Securities held-to-maturity, estimated fair value 299,975   249,674      
Allowance for Credit Losses (86)   (48)      
Mortgage-backed securities:            
Securities Financing Transaction [Line Items]            
Amortized Cost 767,150   631,604      
Held-to-maturity, gross unrealized gains 10,283   16,263      
Held-to-maturity, gross unrealized losses (4,925)   (343)      
Securities held-to-maturity, estimated fair value 772,508   647,524      
Allowance for Credit Losses (108)   (117)      
Mortgage-backed securities: | FHLMC            
Securities Financing Transaction [Line Items]            
Amortized Cost 359,449   232,942      
Held-to-maturity, gross unrealized gains 3,568   5,383      
Held-to-maturity, gross unrealized losses (2,881)   (124)      
Securities held-to-maturity, estimated fair value 360,136   238,201      
Allowance for Credit Losses 0   0      
Mortgage-backed securities: | FNMA            
Securities Financing Transaction [Line Items]            
Amortized Cost 12,648   190      
Available-for-sale, gross unrealized gains 1   2      
Available-for-sale, gross unrealized losses 0   0      
Debt securities available-for-sale, at estimated fair value 12,649   192      
Allowance for Credit Losses 0   0      
Amortized Cost 326,877   293,615      
Held-to-maturity, gross unrealized gains 4,887   7,640      
Held-to-maturity, gross unrealized losses (1,964)   (147)      
Securities held-to-maturity, estimated fair value 329,800   301,108      
Allowance for Credit Losses 0   0      
Mortgage-backed securities: | GNMA            
Securities Financing Transaction [Line Items]            
Amortized Cost 44,010   67,334      
Held-to-maturity, gross unrealized gains 1,056   2,014      
Held-to-maturity, gross unrealized losses (34)   (12)      
Securities held-to-maturity, estimated fair value 45,032   69,336      
Allowance for Credit Losses 0   0      
Mortgage-backed securities: | SBA            
Securities Financing Transaction [Line Items]            
Amortized Cost 4,654   5,392      
Held-to-maturity, gross unrealized gains 12   0      
Held-to-maturity, gross unrealized losses (43)   (60)      
Securities held-to-maturity, estimated fair value 4,623   5,332      
Allowance for Credit Losses 0   0      
Mortgage-backed securities: | Other            
Securities Financing Transaction [Line Items]            
Amortized Cost 32,160   32,321      
Held-to-maturity, gross unrealized gains 760   1,226      
Held-to-maturity, gross unrealized losses (3)   0      
Securities held-to-maturity, estimated fair value 32,917   33,547      
Allowance for Credit Losses (108)   $ (117)      
Mortgage-backed securities - agency commercial            
Securities Financing Transaction [Line Items]            
Amortized Cost 17,047          
Available-for-sale, gross unrealized gains 0          
Available-for-sale, gross unrealized losses (150)          
Debt securities available-for-sale, at estimated fair value 16,897          
Allowance for Credit Losses $ 0