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Consolidated Statements of Changes in Shareholders' Equity - 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 at Dec. 31, 2019     $ 0 $ 305,035,000 $ 107,831,000 $ 3,695,000 $ 416,561,000
Employee stock purchase plan       49,000     49,000
Dividend reinvestment plan       814,000     814,000
Stock option exercises       3,000   3,000
Stock grants to directors for retainer fees       394,000     394,000
Stock-based compensation expense       2,325,000     2,325,000
Share repurchase program       (6,591,000)     (6,591,000)
Cash dividends         (17,930,000)   (17,930,000)
Net income         44,138,000   44,138,000
Change in net unrealized gain/(loss) on securities available for sale, net of tax effect           1,791,000 1,791,000
Balances at Dec. 31, 2020     0 302,029,000 134,039,000 5,486,000 441,554,000
Employee stock purchase plan       48,000     48,000
Dividend reinvestment plan       877,000     877,000
Stock option exercises       50,000     50,000
Stock grants to directors for retainer fees       344,000     344,000
Stock-based compensation expense       3,784,000     3,784,000
Share repurchase program       (21,380,000)     (21,380,000)
Cash dividends         (18,524,000)   (18,524,000)
Net income         59,021,000   59,021,000
Change in net unrealized gain/(loss) on securities available for sale, net of tax effect           (9,215,000) (9,215,000)
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       45,000     45,000
Dividend reinvestment plan       867,000     867,000
Stock option exercises       36,000     36,000
Stock grants to directors for retainer fees       359,000     359,000
Stock-based compensation expense       3,377,000     3,377,000
Cash dividends         (19,602,000)   (19,602,000)
Net income         61,063,000   61,063,000
Change in net unrealized gain/(loss) on securities available for sale, net of tax effect           (61,612,000) (61,612,000)
Balances at Dec. 31, 2022     $ 0 $ 290,436,000 $ 216,313,000 $ (65,341,000) $ 441,408,000