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Condensed Parent Only Financial Information Condensed Statements of Cash Flows (Details) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Net Cash Provided by (Used in) Operating Activities                      
Net income $ 4,037,000 $ 2,584,000 $ 1,886,000 $ 3,397,000 $ 3,968,000 $ 2,665,000 $ 3,723,000 $ 4,553,000 $ 11,905,000 $ 14,909,000 $ 16,514,000
Equity in undistributed earnings of consolidated subsidiaries                 (354,000) (790,000) (481,000)
Share-based compensation                 1,078,000 994,000 1,063,000
Excess tax benefit from share-based compensation                 (66,000) (142,000) 0
Net (decrease) increase in other liabilities                 1,907,000 1,367,000 1,002,000
Other, net                 (2,857,000) (3,861,000) (1,033,000)
Net cash provided by operating activities                 22,408,000 26,162,000 23,220,000
Net Cash Provided by (Used in) Investing Activities                      
Net cash used in investing activities                 (46,353,000) (44,308,000) (149,585,000)
Net Cash Provided by (Used in) Financing Activities                      
Net (decrease) increase in short-term borrowed funds                 (1,000,000) (1,500,000) 1,500,000
Proceeds from issuance of subordinated notes payable                 9,090,000 0 0
Repayment of subordinated notes payable                 (7,875,000) 0 0
Proceeds from exercise of stock options                 0 0 300,000
Purchase of treasury stock                 (323,000) (467,000) (946,000)
Excess tax benefit from share-based compensation                 0 0 267,000
Cash dividends paid                 (4,538,000) (4,176,000) (3,816,000)
Net cash (used in) provided by financing activities                 (1,033,000) (17,901,000) 136,692,000
Net (decrease) increase in cash and cash equivalents                 (24,978,000) (36,047,000) 10,327,000
Cash and cash equivalents at the beginning of the period       77,517,000       113,564,000 77,517,000 113,564,000  
Cash and cash equivalents at the end of the period 52,539,000       77,517,000       52,539,000 77,517,000 113,564,000
Parent company                      
Net Cash Provided by (Used in) Operating Activities                      
Net income                 11,905,000 14,909,000 16,514,000
Equity in undistributed earnings of consolidated subsidiaries                 (15,086,000) (18,719,000) (20,185,000)
Share-based compensation                 1,078,000 994,000 448,000
Excess tax benefit from share-based compensation                 (37,000) (83,000) 0
Net (decrease) increase in other liabilities                 (4,170,000) 1,198,000 2,390,000
Other, net                 (2,233,000) (3,162,000) (481,000)
Net cash provided by operating activities                 (8,543,000) (4,863,000) (1,314,000)
Net Cash Provided by (Used in) Investing Activities                      
Dividends received from subsidiaries                 14,534,000 13,534,000 7,034,000
Capital contributions to subsidiaries                 0 (3,500,000) (3,000,000)
Net cash used in investing activities                 14,534,000 10,034,000 4,034,000
Net Cash Provided by (Used in) Financing Activities                      
Net (decrease) increase in short-term borrowed funds                 (1,000,000) (1,500,000) 1,500,000
Proceeds from issuance of subordinated notes payable                 9,090,000 0 0
Repayment of subordinated notes payable                 (7,875,000) 0 0
Proceeds from exercise of stock options                 0 0 300,000
Purchase of treasury stock                 (323,000) (467,000) (946,000)
Excess tax benefit from share-based compensation                 0 0 162,000
Cash dividends paid                 (4,538,000) (4,176,000) (3,816,000)
Net cash (used in) provided by financing activities                 (4,646,000) (6,143,000) (2,800,000)
Net (decrease) increase in cash and cash equivalents                 1,345,000 (972,000) (80,000)
Cash and cash equivalents at the beginning of the period       $ 127,000       $ 1,099,000 127,000 1,099,000  
Cash and cash equivalents at the end of the period $ 1,472,000       $ 127,000       $ 1,472,000 $ 127,000 $ 1,099,000