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Securities - Amortized Cost and Estimated Fair Value of Securities Available-for-Sale and Held-to-Maturity (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Securities Financing Transaction [Line Items]            
Amortized Cost $ 247,199   $ 180,154      
Available-for-sale, gross unrealized gains 2,188   3,154      
Available-for-sale, gross unrealized losses (57)   (6)      
Estimated Fair Value 249,330   183,302      
Allowance for Credit Losses 0   0      
Amortized Cost 1,151,339   942,314      
Held-to-maturity, gross unrealized gains 23,239   29,378      
Held-to-maturity, gross unrealized losses (5,455)   (3,226)      
Securities held-to-maturity, estimated fair value 1,169,123   968,466      
Allowance for Credit Losses (1,609) $ (1,717) (1,715) $ (2,446) $ (2,529) $ 0
Total, amortized cost 1,398,538   1,122,468      
Total, gross unrealized gains 25,427   32,532      
Total, gross unrealized losses (5,512)   (3,232)      
Total, estimated fair value 1,418,453   1,151,768      
U.S. government and agency obligations | Securities Investment            
Securities Financing Transaction [Line Items]            
Amortized Cost 144,233   173,790      
Available-for-sale, gross unrealized gains 2,056   3,152      
Available-for-sale, gross unrealized losses (9)   (2)      
Estimated Fair Value 146,280   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 30          
Available-for-sale, gross unrealized losses (3)          
Estimated Fair Value 5,027          
Allowance for Credit Losses 0          
Amortized Cost 71,841   72,305      
Held-to-maturity, gross unrealized gains 1,633   1,615      
Held-to-maturity, gross unrealized losses (1,474)   (2,652)      
Securities held-to-maturity, estimated fair value 72,000   71,268      
Allowance for Credit Losses (1,408)   (1,550)      
Collateralized loan obligations (“CLOs”) | Securities Investment            
Securities Financing Transaction [Line Items]            
Amortized Cost 97,861   6,174      
Available-for-sale, gross unrealized gains 101   0      
Available-for-sale, gross unrealized losses (45)   (4)      
Estimated Fair Value 97,917   6,170      
Allowance for Credit Losses 0   0      
State, municipal and sovereign debt obligations | Securities Investment            
Securities Financing Transaction [Line Items]            
Amortized Cost 301,343   238,405      
Held-to-maturity, gross unrealized gains 9,544   11,500      
Held-to-maturity, gross unrealized losses (690)   (231)      
Securities held-to-maturity, estimated fair value 310,197   249,674      
Allowance for Credit Losses (89)   (48)      
Mortgage-backed securities:            
Securities Financing Transaction [Line Items]            
Amortized Cost 778,155   631,604      
Held-to-maturity, gross unrealized gains 12,062   16,263      
Held-to-maturity, gross unrealized losses (3,291)   (343)      
Securities held-to-maturity, estimated fair value 786,926   647,524      
Allowance for Credit Losses (112)   (117)      
Mortgage-backed securities: | FHLMC            
Securities Financing Transaction [Line Items]            
Amortized Cost 340,085   232,942      
Held-to-maturity, gross unrealized gains 4,234   5,383      
Held-to-maturity, gross unrealized losses (1,846)   (124)      
Securities held-to-maturity, estimated fair value 342,473   238,201      
Allowance for Credit Losses 0   0      
Mortgage-backed securities: | FNMA            
Securities Financing Transaction [Line Items]            
Amortized Cost 105   190      
Available-for-sale, gross unrealized gains 1   2      
Available-for-sale, gross unrealized losses 0   0      
Estimated Fair Value 106   192      
Allowance for Credit Losses 0   0      
Amortized Cost 349,643   293,615      
Held-to-maturity, gross unrealized gains 5,640   7,640      
Held-to-maturity, gross unrealized losses (1,379)   (147)      
Securities held-to-maturity, estimated fair value 353,904   301,108      
Allowance for Credit Losses 0   0      
Mortgage-backed securities: | GNMA            
Securities Financing Transaction [Line Items]            
Amortized Cost 51,286   67,334      
Held-to-maturity, gross unrealized gains 1,309   2,014      
Held-to-maturity, gross unrealized losses (22)   (12)      
Securities held-to-maturity, estimated fair value 52,573   69,336      
Allowance for Credit Losses 0   0      
Mortgage-backed securities: | SBA            
Securities Financing Transaction [Line Items]            
Amortized Cost 4,925   5,392      
Held-to-maturity, gross unrealized gains 15   0      
Held-to-maturity, gross unrealized losses (44)   (60)      
Securities held-to-maturity, estimated fair value 4,896   5,332      
Allowance for Credit Losses 0   0      
Mortgage-backed securities: | Other            
Securities Financing Transaction [Line Items]            
Amortized Cost 32,216   32,321      
Held-to-maturity, gross unrealized gains 864   1,226      
Held-to-maturity, gross unrealized losses 0   0      
Securities held-to-maturity, estimated fair value 33,080   33,547      
Allowance for Credit Losses $ (112)   $ (117)