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Segment Reporting (Business Segment Profit (Loss)) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Segment Reporting Information [Line Items]      
Net interest income (expense) $ 129,912 $ 122,864 $ 112,615
Provision for loan losses (8,044) (8,934) (13,361)
Noninterest income 40,381 36,478 34,730
Noninterest expense (102,828) (100,876) (90,513)
Income before income taxes 59,421 49,532 43,471
Income tax (expense) benefit (10,559) (10,006) (9,945)
Net income 48,862 39,526 33,526
Operating Segment [Member] | Banking [Member]      
Segment Reporting Information [Line Items]      
Net interest income (expense) 132,383 125,334 115,086
Provision for loan losses (8,044) (8,934) (13,361)
Noninterest income 29,390 26,295 24,921
Noninterest expense (88,801) (84,927) (78,845)
Income before income taxes 64,928 57,768 47,801
Income tax (expense) benefit (11,190) (11,622) (12,253)
Net income 53,738 46,146 35,548
Operating Segment [Member] | Non-Banking [Member]      
Segment Reporting Information [Line Items]      
Noninterest income 11,694 10,780 9,172
Noninterest expense (11,899) (12,663) (9,264)
Income before income taxes (205) (1,883) (92)
Income tax (expense) benefit 33 (129) 491
Net income (172) (2,012) 399
Holding Company and Other [Member]      
Segment Reporting Information [Line Items]      
Net interest income (expense) (2,471) (2,470) (2,471)
Noninterest income (703) (597) 637
Noninterest expense (2,128) (3,286) (2,404)
Income before income taxes (5,302) (6,353) (4,238)
Income tax (expense) benefit 598 1,745 1,817
Net income $ (4,704) $ (4,608) $ (2,421)