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Parent Company Financial Statements, Condensed Balance Sheets (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Assets [Abstract]    
Cash on deposit $ 47,528 $ 48,603
Goodwill 65,490 65,490
Premises and equipment, net 46,318 47,940
Other assets 41,459 36,984
Total assets 4,136,231 3,932,169
Liabilities and shareholders' equity [Abstract]    
Long-term debt 59,341 61,341
Other liabilities 25,923 24,244
Total liabilities 3,605,532 3,431,554
Shareholders' equity 530,699 500,615
Total liabilities and shareholders' equity 4,136,231 3,932,169
Parent Company [Member]    
Assets [Abstract]    
Cash on deposit 1,500 1,525
Investment in and advances to subsidiaries 587,575 556,975
Goodwill 4,973 4,973
Premises and equipment, net 250 142
Other assets 200 391
Total assets 594,498 564,006
Liabilities and shareholders' equity [Abstract]    
Long-term debt 61,341 61,341
Other liabilities 2,458 2,050
Total liabilities 63,799 63,391
Shareholders' equity 530,699 500,615
Total liabilities and shareholders' equity $ 594,498 $ 564,006