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Securities - Amortized Cost and Estimated Fair Value of Securities Available-for-Sale and Held-to-Maturity (Details) - USD ($)
Sep. 30, 2020
Dec. 31, 2019
Securities Financing Transaction [Line Items]    
Available-for-sale, amortized cost $ 165,920,000 $ 149,640,000
Available-for-sale, gross unrealized gains 3,717,000 1,413,000
Available-for-sale, gross unrealized losses (3,000) (93,000)
Available-for-sale, estimated fair value 169,634,000 150,960,000
Allowance for Credit Losses 0  
Held-to-maturity, amortized cost 877,613,000  
Amortized Cost 877,613,000 772,975,000
Held-to-maturity, gross unrealized gains 29,249,000 8,224,000
Held-to-maturity, gross unrealized losses (4,444,000) (3,909,000)
Estimated Fair Value 902,418,000 777,290,000
Allowance for Credit Losses (2,393,000) 0
Total, amortized cost 1,043,533,000 922,615,000
Total, gross unrealized gains 32,966,000 9,637,000
Total, gross unrealized losses (4,447,000) (4,002,000)
Total, estimated fair value 1,072,052,000 928,250,000
Investment securities    
Securities Financing Transaction [Line Items]    
Available-for-sale, amortized cost 165,680,000 149,145,000
Available-for-sale, gross unrealized gains 3,714,000 1,408,000
Available-for-sale, gross unrealized losses (3,000) (93,000)
Available-for-sale, estimated fair value 169,391,000 150,460,000
Allowance for Credit Losses 0  
Held-to-maturity, amortized cost 292,151,000  
Amortized Cost   208,961,000
Held-to-maturity, gross unrealized gains 11,089,000 2,384,000
Held-to-maturity, gross unrealized losses (4,092,000) (2,629,000)
Estimated Fair Value 299,148,000 208,716,000
Allowance for Credit Losses (1,612,000)  
U.S. government and agency obligations | Investment securities    
Securities Financing Transaction [Line Items]    
Available-for-sale, amortized cost 158,778,000 149,120,000
Available-for-sale, gross unrealized gains 3,653,000 1,408,000
Available-for-sale, gross unrealized losses (3,000) (93,000)
Available-for-sale, estimated fair value 162,428,000 150,435,000
Allowance for Credit Losses 0  
Held-to-maturity, amortized cost 4,997,000  
Amortized Cost   4,984,000
Held-to-maturity, gross unrealized gains 14,000 14,000
Held-to-maturity, gross unrealized losses 0 0
Estimated Fair Value 5,011,000 4,998,000
Allowance for Credit Losses 0  
State and municipal obligations | Investment securities    
Securities Financing Transaction [Line Items]    
Available-for-sale, amortized cost 2,402,000 25,000
Available-for-sale, gross unrealized gains 0 0
Available-for-sale, gross unrealized losses 0 0
Available-for-sale, estimated fair value 2,402,000 25,000
Allowance for Credit Losses 0  
Held-to-maturity, amortized cost 214,865,000  
Amortized Cost   124,430,000
Held-to-maturity, gross unrealized gains 9,375,000 1,537,000
Held-to-maturity, gross unrealized losses (225,000) (208,000)
Estimated Fair Value 224,015,000 125,759,000
Allowance for Credit Losses (33,000)  
Corporate debt securities    
Securities Financing Transaction [Line Items]    
Amortized Cost 38,332,000  
Estimated Fair Value 34,899,000  
Corporate debt securities | Investment securities    
Securities Financing Transaction [Line Items]    
Available-for-sale, amortized cost 4,500,000  
Available-for-sale, gross unrealized gains 61,000  
Available-for-sale, gross unrealized losses 0  
Available-for-sale, estimated fair value 4,561,000  
Held-to-maturity, amortized cost 72,289,000  
Amortized Cost   79,547,000
Held-to-maturity, gross unrealized gains 1,700,000 833,000
Held-to-maturity, gross unrealized losses (3,867,000) (2,421,000)
Estimated Fair Value 70,122,000 77,959,000
Allowance for Credit Losses (1,579,000)  
Mortgage-backed securities    
Securities Financing Transaction [Line Items]    
Held-to-maturity, amortized cost 585,462,000  
Amortized Cost   564,014,000
Held-to-maturity, gross unrealized gains 18,160,000 5,840,000
Held-to-maturity, gross unrealized losses (352,000) (1,280,000)
Estimated Fair Value 603,270,000 568,574,000
Allowance for Credit Losses (781,000) 0
Mortgage-backed securities | FHLMC    
Securities Financing Transaction [Line Items]    
Held-to-maturity, amortized cost 202,329,000  
Amortized Cost   206,985,000
Held-to-maturity, gross unrealized gains 6,093,000 2,221,000
Held-to-maturity, gross unrealized losses (135,000) (524,000)
Estimated Fair Value 208,287,000 208,682,000
Allowance for Credit Losses 0  
Mortgage-backed securities | FNMA    
Securities Financing Transaction [Line Items]    
Available-for-sale, amortized cost 240,000 495,000
Available-for-sale, gross unrealized gains 3,000 5,000
Available-for-sale, gross unrealized losses 0 0
Available-for-sale, estimated fair value 243,000 500,000
Allowance for Credit Losses 0  
Held-to-maturity, amortized cost 245,524,000  
Amortized Cost   244,428,000
Held-to-maturity, gross unrealized gains 7,799,000 2,680,000
Held-to-maturity, gross unrealized losses (141,000) (493,000)
Estimated Fair Value 253,182,000 246,615,000
Allowance for Credit Losses 0  
Mortgage-backed securities | GNMA    
Securities Financing Transaction [Line Items]    
Held-to-maturity, amortized cost 82,230,000  
Amortized Cost   110,661,000
Held-to-maturity, gross unrealized gains 2,457,000 939,000
Held-to-maturity, gross unrealized losses (16,000) (212,000)
Estimated Fair Value 84,671,000 111,388,000
Allowance for Credit Losses 0  
Mortgage-backed securities | SBA    
Securities Financing Transaction [Line Items]    
Held-to-maturity, amortized cost 5,634,000  
Amortized Cost   1,940,000
Held-to-maturity, gross unrealized gains 0 0
Held-to-maturity, gross unrealized losses (60,000) (51,000)
Estimated Fair Value 5,574,000 $ 1,889,000
Allowance for Credit Losses 0  
Mortgage-backed securities | CMO    
Securities Financing Transaction [Line Items]    
Held-to-maturity, amortized cost 49,745,000  
Held-to-maturity, gross unrealized gains 1,811,000  
Held-to-maturity, gross unrealized losses 0  
Estimated Fair Value 51,556,000  
Allowance for Credit Losses $ (781,000)