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Consolidated Statements of Changes in Shareholders' Equity (Unaudited) - USD ($)
Common Stock [Member]
Capital Surplus [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Member]
Total
Increase (Decrease) in Stockholders' Equity [Roll forward]          
Implementation of ASU | ASU 2014-09 [Member]     $ 453,000   $ 453,000
Implementation of ASU | ASU 2016-01 [Member]     (507,000) $ 507,000 0
Balance at Dec. 31, 2017 $ 88,465,000 $ 221,472,000 224,268,000 (3,506,000) 530,699,000
Balance (in shares) at Dec. 31, 2017 17,692,912        
Increase (Decrease) in Stockholders' Equity [Roll forward]          
Net income     43,519,000   43,519,000
Other comprehensive income (loss), net of tax       (7,883,000) (7,883,000)
Cash dividends declared     (18,042,000)   (18,042,000)
Issuance of common stock $ 185,000 818,000     1,003,000
Issuance of common stock (in shares) 37,017        
Issuance of restricted stock $ 57,000 (57,000)     0
Issuance of restricted stock (in shares) 11,435        
Vesting of restricted stock $ (60,000) 60,000     0
Vesting of restricted stock (in shares) (11,997)        
Forfeiture of restricted stock $ (6,000) 6,000     0
Forfeiture of restricted stock (in shares) (1,292)        
Stock-based compensation   515,000     515,000
Balance at Sep. 30, 2018 $ 88,641,000 222,814,000 249,691,000 (10,882,000) 550,264,000
Balance (in shares) at Sep. 30, 2018 17,728,075        
Balance at Jun. 30, 2018 $ 88,626,000 222,486,000 239,955,000 (8,892,000) 542,175,000
Balance (in shares) at Jun. 30, 2018 17,725,313        
Increase (Decrease) in Stockholders' Equity [Roll forward]          
Net income     16,106,000   16,106,000
Other comprehensive income (loss), net of tax       (1,990,000) (1,990,000)
Cash dividends declared     (6,370,000)   (6,370,000)
Issuance of common stock $ 21,000 182,000     203,000
Issuance of common stock (in shares) 3,939        
Forfeiture of restricted stock $ (6,000) 6,000     0
Forfeiture of restricted stock (in shares) (1,177)        
Stock-based compensation   140,000     140,000
Balance at Sep. 30, 2018 $ 88,641,000 222,814,000 249,691,000 (10,882,000) 550,264,000
Balance (in shares) at Sep. 30, 2018 17,728,075        
Increase (Decrease) in Stockholders' Equity [Roll forward]          
Implementation of ASU | ASU 2016-02 [Member]     (480,000) 0 (480,000)
Balance at Dec. 31, 2018 $ 88,665,000 223,161,000 258,935,000 (6,611,000) $ 564,150,000
Balance (in shares) at Dec. 31, 2018 17,732,853       17,732,853
Increase (Decrease) in Stockholders' Equity [Roll forward]          
Net income     48,532,000   $ 48,532,000
Other comprehensive income (loss), net of tax       11,540,000 11,540,000
Cash dividends declared     (19,494,000)   (19,494,000)
Issuance of common stock $ 148,000 533,000     681,000
Issuance of common stock (in shares) 29,725        
Issuance of restricted stock $ 140,000 (140,000)     0
Issuance of restricted stock (in shares) 27,921        
Vesting of restricted stock $ (64,000) 64,000     0
Vesting of restricted stock (in shares) (12,660)        
Forfeiture of restricted stock $ (3,000) 3,000     0
Forfeiture of restricted stock (in shares) (588)        
Stock-based compensation   589,000     589,000
Balance at Sep. 30, 2019 $ 88,886,000 224,210,000 287,493,000 4,929,000 $ 605,518,000
Balance (in shares) at Sep. 30, 2019 17,777,251       17,777,251
Balance at Jun. 30, 2019 $ 88,862,000 223,833,000 278,960,000 3,053,000 $ 594,708,000
Balance (in shares) at Jun. 30, 2019 17,772,309        
Increase (Decrease) in Stockholders' Equity [Roll forward]          
Net income     15,269,000   15,269,000
Other comprehensive income (loss), net of tax       1,876,000 1,876,000
Cash dividends declared     (6,736,000)   (6,736,000)
Issuance of common stock $ 24,000 183,000     207,000
Issuance of common stock (in shares) 4,942        
Forfeiture of restricted stock $ 0 0     0
Forfeiture of restricted stock (in shares) 0        
Stock-based compensation   194,000     194,000
Balance at Sep. 30, 2019 $ 88,886,000 $ 224,210,000 $ 287,493,000 $ 4,929,000 $ 605,518,000
Balance (in shares) at Sep. 30, 2019 17,777,251       17,777,251