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Securities - Amortized Cost and Estimated Fair Value of Securities Available-for-Sale and Held-to-Maturity (Details) - USD ($)
Dec. 31, 2020
Dec. 31, 2019
Securities Financing Transaction [Line Items]    
Available-for-sale, amortized cost $ 180,154,000 $ 149,640,000
Available-for-sale, gross unrealized gains 3,154,000 1,413,000
Available-for-sale, gross unrealized losses (6,000) (93,000)
Available-for-sale, estimated fair value 183,302,000 150,960,000
Allowance for Credit Losses 0  
Held-to-maturity, gross unrealized gains 942,314,000 772,975,000
Held-to-maturity, gross unrealized losses 29,378,000 8,224,000
Held-to-maturity, Gross Unrealized Losses (3,226,000) (3,909,000)
Estimated Fair Value 968,466,000 777,290,000
Allowance for Credit Losses (1,715,000) 0
Total, Amortized Cost 1,122,468,000 922,615,000
Total, Gross Unrealized Gains 32,532,000 9,637,000
Total, Gross Unrealized Losses (3,232,000) (4,002,000)
Total, Estimated Fair Value 1,151,768,000  
Debt Securities   928,250,000
Investment securities:    
Securities Financing Transaction [Line Items]    
Available-for-sale, amortized cost 179,964,000 149,145,000
Available-for-sale, gross unrealized gains 3,152,000 1,408,000
Available-for-sale, gross unrealized losses (6,000) (93,000)
Available-for-sale, estimated fair value 183,110,000 150,460,000
Allowance for Credit Losses 0  
Held-to-maturity, gross unrealized gains 310,710,000 208,961,000
Held-to-maturity, gross unrealized losses 13,115,000 2,384,000
Held-to-maturity, Gross Unrealized Losses (2,883,000) (2,629,000)
Estimated Fair Value 320,942,000 208,716,000
Allowance for Credit Losses (1,598,000)  
U.S. government and agency obligations | Investment securities:    
Securities Financing Transaction [Line Items]    
Available-for-sale, amortized cost 173,790,000 149,120,000
Available-for-sale, gross unrealized gains 3,152,000 1,408,000
Available-for-sale, gross unrealized losses (2,000) (93,000)
Available-for-sale, estimated fair value 176,940,000 150,435,000
Allowance for Credit Losses 0  
Held-to-maturity, gross unrealized gains   4,984,000
Held-to-maturity, gross unrealized losses   14,000
Held-to-maturity, Gross Unrealized Losses   0
Estimated Fair Value   4,998,000
Collateralized loan obligations | Investment securities:    
Securities Financing Transaction [Line Items]    
Available-for-sale, amortized cost 6,174,000  
Available-for-sale, gross unrealized gains 0  
Available-for-sale, gross unrealized losses (4,000)  
Available-for-sale, estimated fair value 6,170,000  
Allowance for Credit Losses 0  
Corporate debt securities    
Securities Financing Transaction [Line Items]    
Held-to-maturity, gross unrealized gains 38,332,000  
Estimated Fair Value 35,935,000  
Corporate debt securities | Investment securities:    
Securities Financing Transaction [Line Items]    
Held-to-maturity, gross unrealized gains 72,305,000 79,547,000
Held-to-maturity, gross unrealized losses 1,615,000 833,000
Held-to-maturity, Gross Unrealized Losses (2,652,000) (2,421,000)
Estimated Fair Value 71,268,000 77,959,000
Allowance for Credit Losses (1,550,000)  
Mortgage-backed Securities    
Securities Financing Transaction [Line Items]    
Held-to-maturity, gross unrealized gains 631,604,000 564,014,000
Held-to-maturity, gross unrealized losses 16,263,000 5,840,000
Held-to-maturity, Gross Unrealized Losses (343,000) (1,280,000)
Estimated Fair Value 647,524,000 568,574,000
Allowance for Credit Losses (117,000) 0
Mortgage-backed Securities | FHLMC    
Securities Financing Transaction [Line Items]    
Held-to-maturity, gross unrealized gains 232,942,000 206,985,000
Held-to-maturity, gross unrealized losses 5,383,000 2,221,000
Held-to-maturity, Gross Unrealized Losses (124,000) (524,000)
Estimated Fair Value 238,201,000 208,682,000
Allowance for Credit Losses 0  
Mortgage-backed Securities | FNMA    
Securities Financing Transaction [Line Items]    
Available-for-sale, amortized cost 190,000 495,000
Available-for-sale, gross unrealized gains 2,000 5,000
Available-for-sale, gross unrealized losses 0 0
Available-for-sale, estimated fair value 192,000 500,000
Allowance for Credit Losses 0  
Held-to-maturity, gross unrealized gains 293,615,000 244,428,000
Held-to-maturity, gross unrealized losses 7,640,000 2,680,000
Held-to-maturity, Gross Unrealized Losses (147,000) (493,000)
Estimated Fair Value 301,108,000 246,615,000
Allowance for Credit Losses 0  
Mortgage-backed Securities | GNMA    
Securities Financing Transaction [Line Items]    
Held-to-maturity, gross unrealized gains 67,334,000 110,661,000
Held-to-maturity, gross unrealized losses 2,014,000 939,000
Held-to-maturity, Gross Unrealized Losses (12,000) (212,000)
Estimated Fair Value 69,336,000 111,388,000
Allowance for Credit Losses 0  
Mortgage-backed Securities | SBA    
Securities Financing Transaction [Line Items]    
Held-to-maturity, gross unrealized gains 5,392,000 1,940,000
Held-to-maturity, gross unrealized losses 0 0
Held-to-maturity, Gross Unrealized Losses (60,000) (51,000)
Estimated Fair Value 5,332,000 1,889,000
Allowance for Credit Losses 0  
Mortgage-backed Securities | CMO    
Securities Financing Transaction [Line Items]    
Held-to-maturity, gross unrealized gains 32,321,000  
Held-to-maturity, gross unrealized losses 1,226,000  
Held-to-maturity, Gross Unrealized Losses 0  
Estimated Fair Value 33,547,000  
Allowance for Credit Losses (117,000)  
State and municipal obligations | Investment securities:    
Securities Financing Transaction [Line Items]    
Available-for-sale, amortized cost   25,000
Available-for-sale, gross unrealized gains   0
Available-for-sale, gross unrealized losses   0
Available-for-sale, estimated fair value   25,000
Held-to-maturity, gross unrealized gains 238,405,000 124,430,000
Held-to-maturity, gross unrealized losses 11,500,000 1,537,000
Held-to-maturity, Gross Unrealized Losses (231,000) (208,000)
Estimated Fair Value 249,674,000 $ 125,759,000
Allowance for Credit Losses $ (48,000)