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Securities - Amortized Cost and Estimated Fair Value of Securities Available-for-Sale and Held-to-Maturity (Details) - USD ($)
Jun. 30, 2020
Dec. 31, 2019
Securities Financing Transaction [Line Items]    
Available-for-sale, Amortized Cost $ 149,172,000 $ 149,640,000
Available-for-sale, Gross Unrealized Gains 4,067,000 1,413,000
Available-for-sale, Gross Unrealized Losses 0 (93,000)
Available-for-sale, Estimated Fair Value 153,239,000 150,960,000
Allowance for Credit Losses 0  
Held-to-maturity, Amortized Cost 874,119,000  
Amortized Cost 874,119,000 772,975,000
Held-to-maturity, Gross Unrealized Gains 28,016,000 8,224,000
Held-to-maturity, Gross Unrealized Losses (6,238,000) (3,909,000)
Estimated Fair Value 895,897,000 777,290,000
Allowance for Credit Losses (2,446,000) 0
Total, Amortized Cost 1,023,291,000 922,615,000
Total, Gross Unrealized Gains 32,083,000 9,637,000
Total, Gross Unrealized Losses (6,238,000) (4,002,000)
Total, Estimated Fair Value 1,049,136,000 928,250,000
Investment securities    
Securities Financing Transaction [Line Items]    
Available-for-sale, Amortized Cost 148,862,000 149,145,000
Available-for-sale, Gross Unrealized Gains 4,063,000 1,408,000
Available-for-sale, Gross Unrealized Losses 0 (93,000)
Available-for-sale, Estimated Fair Value 152,925,000 150,460,000
Allowance for Credit Losses 0  
Held-to-maturity, Amortized Cost 309,565,000  
Amortized Cost   208,961,000
Held-to-maturity, Gross Unrealized Gains 9,638,000 2,384,000
Held-to-maturity, Gross Unrealized Losses (6,065,000) (2,629,000)
Estimated Fair Value 313,138,000 208,716,000
Allowance for Credit Losses (1,617,000)  
U.S. government and agency obligations | Investment securities    
Securities Financing Transaction [Line Items]    
Available-for-sale, Amortized Cost 138,460,000 149,120,000
Available-for-sale, Gross Unrealized Gains 4,004,000 1,408,000
Available-for-sale, Gross Unrealized Losses 0 (93,000)
Available-for-sale, Estimated Fair Value 142,464,000 150,435,000
Allowance for Credit Losses 0  
Held-to-maturity, Amortized Cost 6,242,000  
Amortized Cost   4,984,000
Held-to-maturity, Gross Unrealized Gains 38,000 14,000
Held-to-maturity, Gross Unrealized Losses 0 0
Estimated Fair Value 6,280,000 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 227,046,000  
Amortized Cost   124,430,000
Held-to-maturity, Gross Unrealized Gains 8,701,000 1,537,000
Held-to-maturity, Gross Unrealized Losses (185,000) (208,000)
Estimated Fair Value 235,562,000 125,759,000
Allowance for Credit Losses (35,000)  
Corporate debt securities    
Securities Financing Transaction [Line Items]    
Amortized Cost 38,332,000  
Estimated Fair Value 33,208,000  
Corporate debt securities | Investment securities    
Securities Financing Transaction [Line Items]    
Available-for-sale, Amortized Cost 8,000,000  
Available-for-sale, Gross Unrealized Gains 59,000  
Available-for-sale, Gross Unrealized Losses 0  
Available-for-sale, Estimated Fair Value 8,059,000  
Held-to-maturity, Amortized Cost 76,277,000  
Amortized Cost   79,547,000
Held-to-maturity, Gross Unrealized Gains 899,000 833,000
Held-to-maturity, Gross Unrealized Losses (5,880,000) (2,421,000)
Estimated Fair Value 71,296,000 77,959,000
Allowance for Credit Losses (1,582,000)  
Mortgage-backed securities    
Securities Financing Transaction [Line Items]    
Held-to-maturity, Amortized Cost 564,554,000  
Amortized Cost   564,014,000
Held-to-maturity, Gross Unrealized Gains 18,378,000 5,840,000
Held-to-maturity, Gross Unrealized Losses (173,000) (1,280,000)
Estimated Fair Value 582,759,000 568,574,000
Allowance for Credit Losses (829,000) 0
Mortgage-backed securities | FHLMC    
Securities Financing Transaction [Line Items]    
Held-to-maturity, Amortized Cost 190,352,000  
Amortized Cost   206,985,000
Held-to-maturity, Gross Unrealized Gains 6,548,000 2,221,000
Held-to-maturity, Gross Unrealized Losses (33,000) (524,000)
Estimated Fair Value 196,867,000 208,682,000
Allowance for Credit Losses 0  
Mortgage-backed securities | FNMA    
Securities Financing Transaction [Line Items]    
Available-for-sale, Amortized Cost 310,000 495,000
Available-for-sale, Gross Unrealized Gains 4,000 5,000
Available-for-sale, Gross Unrealized Losses 0 0
Available-for-sale, Estimated Fair Value 314,000 500,000
Allowance for Credit Losses 0  
Held-to-maturity, Amortized Cost 226,452,000  
Amortized Cost   244,428,000
Held-to-maturity, Gross Unrealized Gains 8,673,000 2,680,000
Held-to-maturity, Gross Unrealized Losses (29,000) (493,000)
Estimated Fair Value 235,096,000 246,615,000
Allowance for Credit Losses 0  
Mortgage-backed securities | GNMA    
Securities Financing Transaction [Line Items]    
Held-to-maturity, Amortized Cost 92,076,000  
Amortized Cost   110,661,000
Held-to-maturity, Gross Unrealized Gains 2,710,000 939,000
Held-to-maturity, Gross Unrealized Losses (20,000) (212,000)
Estimated Fair Value 94,766,000 111,388,000
Allowance for Credit Losses 0  
Mortgage-backed securities | SBA    
Securities Financing Transaction [Line Items]    
Held-to-maturity, Amortized Cost 5,849,000  
Amortized Cost   1,940,000
Held-to-maturity, Gross Unrealized Gains 0 0
Held-to-maturity, Gross Unrealized Losses (61,000) (51,000)
Estimated Fair Value 5,788,000 $ 1,889,000
Allowance for Credit Losses 0  
Mortgage-backed securities | CMO    
Securities Financing Transaction [Line Items]    
Held-to-maturity, Amortized Cost 49,825,000  
Held-to-maturity, Gross Unrealized Gains 447,000  
Held-to-maturity, Gross Unrealized Losses (30,000)  
Estimated Fair Value 50,242,000  
Allowance for Credit Losses $ (829,000)