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Consolidated Statements of Changes in Shareholders' Equity (Unaudited) - USD ($)
Cumulative Effect, Period of Adoption, Adjustment [Member]
Retained Earnings [Member]
Cumulative Effect, Period of Adoption, Adjustment [Member]
Preferred Stock [Member]
Common Stock Including Additional Paid in Capital [Member]
Retained Earnings [Member]
AOCI Attributable to Parent [Member]
Total
Balances (Accounting Standards Update 2016-13 [Member]) at Dec. 31, 2021 $ 316,000 $ 316,000          
Balances at Dec. 31, 2021     $ 0 $ 285,752,000 $ 174,536,000 $ (3,729,000) $ 456,559,000
Employee stock purchase plan       33,000     33,000
Dividend reinvestment plan       653,000     653,000
Stock-based compensation expense       2,398,000     2,398,000
Cash dividends         (14,607,000)   (14,607,000)
Net income         39,260,000   39,260,000
Change in net unrealized holding gain (loss) on securities available for sale, net of tax effect           (68,734,000) (68,734,000)
Stock grants to directors for retainer fees       347,000     347,000
Stock option exercises       36,000     36,000
Balances at Sep. 30, 2022     0 289,219,000 199,505,000 (72,463,000) 416,261,000
Balances at Jun. 30, 2022     0 288,199,000 188,452,000 (47,668,000) 428,983,000
Employee stock purchase plan       12,000     12,000
Dividend reinvestment plan       218,000     218,000
Stock-based compensation expense       790,000     790,000
Cash dividends         (4,977,000)   (4,977,000)
Net income         16,030,000   16,030,000
Change in net unrealized holding gain (loss) on securities available for sale, net of tax effect           (24,795,000) (24,795,000)
Balances at Sep. 30, 2022     0 289,219,000 199,505,000 (72,463,000) 416,261,000
Balances at Dec. 31, 2022     0 290,436,000 216,313,000 (65,341,000) 441,408,000
Employee stock purchase plan       33,000     33,000
Dividend reinvestment plan       670,000     670,000
Stock-based compensation expense       2,505,000     2,505,000
Cash dividends         (15,662,000)   (15,662,000)
Net income         62,187,000   62,187,000
Change in net unrealized holding gain (loss) on securities available for sale, net of tax effect           (8,247,000) (8,247,000)
Stock grants to directors for retainer fees       317,000     317,000
Balances at Sep. 30, 2023     0 293,961,000 262,838,000 (73,588,000) 483,211,000
Balances at Jun. 30, 2023     0 292,906,000 247,313,000 (61,517,000) 478,702,000
Employee stock purchase plan       11,000     11,000
Dividend reinvestment plan       220,000     220,000
Stock-based compensation expense       824,000     824,000
Cash dividends         (5,330,000)   (5,330,000)
Net income         20,855,000   20,855,000
Change in net unrealized holding gain (loss) on securities available for sale, net of tax effect           (12,071,000) (12,071,000)
Balances at Sep. 30, 2023     $ 0 $ 293,961,000 $ 262,838,000 $ (73,588,000) $ 483,211,000