Securities (Tables)	9 Months Ended
Securities (Tables)	Sep. 30, 2023
Securities [Abstract]
Schedule of Available-for-sale Securities Reconciliation	September 30, 2023 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Approximate Fair Value (Dollars in thousands) Available-for-sale securities U.S. Treasury securities $ 14,797 $ 6 $ - $ 14,803 Mortgage-backed - GSE residential 336,020 - 37,976 298,044 Collateralized mortgage obligations - GSE residential 19,780 - 1,056 18,724 State and political subdivisions 489,976 90 79,624 410,442 Corporate bonds 9,740 - 1,266 8,474 Total available-for-sale securities $ 870,313 $ 96 $ 119,922 $ 750,487 December 31, 2022 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Approximate Fair Value (Dollars in thousands) Available-for-sale securities Mortgage-backed - GSE residential $ 197,243 $ 232 $ 25,166 $ 172,309 Collateralized mortgage obligations - GSE residential 11,629 - 743 10,886 State and political subdivisions 551,007 929 57,440 494,496 Corporate bonds 9,762 - 552 9,210 Total available-for-sale securities $ 769,641 $ 1,161 $ 83,901 $ 686,901
Investments Classified by Contractual Maturity Date	Actual maturities may differ from contractual maturities because issuers may have the rights to call or prepay obligations with or without prepayment penalties. (2) Yields are calculated based on amortized cost using 30/360 day basis. Tax-exempt securities are not tax effected. September 30, 2023 Within After One to After Five to After One Year Five Years Ten Years Ten Years Total (Dollars in thousands) Available-for-sale securities U.S. Treasury securities (1) Amortized cost $ 14,797 $ - $ - $ - $ 14,797 Estimated fair value $ 14,803 $ - $ - $ - $ 14,803 Weighted average yield (2) 5.11 % - % - % - % 5.11 % Mortgage-backed - GSE residential (1) Amortized cost $ - $ 14 $ 1,007 $ 334,999 $ 336,020 Estimated fair value $ - $ 13 $ 891 $ 297,140 $ 298,044 Weighted average yield (2) - % 4.88 % 2.39 % 3.59 % 3.58 % Collateralized mortgage obligations - GSE residential Amortized cost $ - $ - $ 2,267 $ 17,513 $ 19,780 Estimated fair value $ - $ - $ 2,117 $ 16,607 $ 18,724 Weighted average yield (2) - % - % 2.77 % 4.93 % 4.68 % State and political subdivisions Amortized cost $ 744 $ 5,022 $ 93,874 $ 390,336 $ 489,976 Estimated fair value $ 752 $ 4,989 $ 90,036 $ 314,665 $ 410,442 Weighted average yield (2) 3.81 % 4.42 % 3.09 % 2.71 % 2.80 % Corporate bonds Amortized cost $ - $ 143 $ 9,597 $ - $ 9,740 Estimated fair value $ - $ 139 $ 8,335 $ - $ 8,474 Weighted average yield (2) - % 4.22 % 5.71 % - % 5.69 % Total available-for-sale securities Amortized cost $ 15,541 $ 5,179 $ 106,745 $ 742,848 $ 870,313 Estimated fair value $ 15,555 $ 5,141 $ 101,379 $ 628,412 $ 750,487 Weighted average yield 5.05 % 4.41 % 3.32 % 3.16 % 3.21 %
Schedule of Unrealized Loss on Investments	September 30, 2023 Less than 12 Months 12 Months or More Total Fair Value Unrealized Losses Number of Securities Fair Value Unrealized Losses Number of Securities Fair Value Unrealized Losses Number of Securities (Dollars in thousands) Available-for-sale securities U.S. Treasury securities $ - $ - - $ - $ - - $ - $ - - Mortgage-backed - GSE residential 166,408 7,398 27 131,637 30,578 56 298,045 37,976 83 Collateralized mortgage obligations - GSE residential 5,255 282 2 8,786 774 19 14,041 1,056 21 State and political subdivisions 119,719 5,433 112 277,722 74,191 213 397,441 79,624 325 Corporate bonds 4,333 667 1 4,141 599 4 8,474 1,266 5 Total temporarily impaired securities 295,715 $ 13,780 142 $ 422,286 $ 106,142 292 $ 718,001 $ 119,922 434 December 31, 2022 Less than 12 Months 12 Months or More Total Fair Value Unrealized Losses Number of Securities Fair Value Unrealized Losses Number of Securities Fair Value Unrealized Losses Number of Securities (Dollars in thousands) Available-for-sale securities Mortgage-backed - GSE residential $ 91,929 $ 10,410 41 $ 66,036 $ 14,756 16 $ 157,965 $ 25,166 57 Collateralized mortgage obligations - GSE residential 10,636 733 18 251 10 1 10,887 743 19 State and political subdivisions 350,884 36,697 266 52,519 20,743 40 403,403 57,440 306 Corporate bonds 9,210 552 5 - - - 9,210 552 5 Total temporarily impaired securities $ 462,659 $ 48,392 330 $ 118,806 $ 35,509 57 $ 581,465 $ 83,901 387
Available-for-sale, Net Realized Gain	For the Three Months Ended For the Nine Months Ended September 30, 2023 September 30, 2023 Gross Realized Gains Gross Realized Losses Net Realized Loss Gross Realized Gains Gross Realized Losses Net Realized Gain (Dollars in thousands) Available-for-sale securities $ 68 $ (128) $ (60) $ 335 $ (332) $ 3 For the Three Months Ended For the Nine Months Ended September 30, 2022 September 30, 2022 Gross Realized Gains Gross Realized Losses Net Realized Loss Gross Realized Gains Gross Realized Losses Net Realized Loss (Dollars in thousands) Available-for-sale securities $ 1 $ (5) $ (4) $ 3 $ (46) $ (43)
Gain (Loss) on Securities	Three Months Ended Nine Months Ended September 30, September 30, 2023 2022 2023 2022 (Dollars in thousands) Net gains (losses) recognized during the reporting period on equity securities $ 98 $ (87) $ 114 $ (261) Less: net gains recognized during the reporting period on equity securities sold during the reporting period 93 - 93 - Unrealized gains (losses) recognized during the reporting period on equity securities still held at the reporting date $ 5 $ (87) $ 21 $ (261)