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Condensed Parent Only Financial Information Condensed Statements of Cash Flows (Details) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Net Cash Provided by (Used in) Operating Activities                      
Net income $ 3,968,000 $ 2,665,000 $ 3,723,000 $ 4,553,000 $ 4,083,000 $ 4,381,000 $ 3,858,000 $ 4,192,000 $ 14,909,000 $ 16,514,000 $ 14,139,000
Equity in undistributed earnings of consolidated subsidiaries                 (790,000) (481,000) (774,000)
Share-based compensation                 994,000 1,063,000 887,000
Excess tax benefit from share-based compensation                 (142,000) 0 0
Increase in other liabilities                 1,367,000 1,002,000 1,806,000
Other, net                 (3,861,000) (1,033,000) (5,448,000)
Net cash provided by operating activities                 26,162,000 23,220,000 11,874,000
Net Cash Provided by (Used in) Investing Activities                      
Net cash used in investing activities                 (44,308,000) (149,585,000) (332,749,000)
Net Cash Provided by (Used in) Financing Activities                      
Net (decrease) increase in short-term borrowed funds                 (1,500,000) 1,500,000 1,000,000
Proceeds from issuance of long-term debt, net of issuance costs                 0 0 14,469,000
Repayment of long-term debt                 0 0 (4,000,000)
Proceeds from issuance of common stock                 0 0 16,557,000
Proceeds from exercise of stock options                 0 300,000 936,000
Purchase of treasury stock                 (467,000) (946,000) (1,795,000)
Excess tax benefit from share-based compensation                 0 267,000 584,000
Cash dividends paid                 (4,176,000) (3,816,000) (3,396,000)
Net cash (used in) provided by financing activities                 (17,901,000) 136,692,000 342,826,000
Net (decrease) increase in cash and cash equivalents                 (36,047,000) 10,327,000 21,951,000
Cash and cash equivalents at the beginning of the period       113,564,000       103,237,000 113,564,000 103,237,000 81,286,000
Cash and cash equivalents at the end of the period 77,517,000       113,564,000       77,517,000 113,564,000 103,237,000
Parent company                      
Net Cash Provided by (Used in) Operating Activities                      
Net income                 14,909,000 16,514,000 14,139,000
Equity in undistributed earnings of consolidated subsidiaries                 (18,719,000) (20,185,000) (17,185,000)
Share-based compensation                 994,000 448,000 416,000
Excess tax benefit from share-based compensation                 (83,000) 0 0
Increase in other liabilities                 1,198,000 2,390,000 1,002,000
Other, net                 (3,162,000) (481,000) (1,147,000)
Net cash provided by operating activities                 (4,863,000) (1,314,000) (2,775,000)
Net Cash Provided by (Used in) Investing Activities                      
Dividends received from subsidiaries                 13,534,000 7,034,000 8,000,000
Capital contributions to subsidiaries                 (3,500,000) (3,000,000) (32,980,000)
Net cash used in investing activities                 10,034,000 4,034,000 (24,980,000)
Net Cash Provided by (Used in) Financing Activities                      
Net (decrease) increase in short-term borrowed funds                 (1,500,000) 1,500,000 1,000,000
Proceeds from issuance of long-term debt, net of issuance costs                 0 0 14,469,000
Repayment of long-term debt                 0 0 (4,000,000)
Proceeds from issuance of common stock                 0 0 16,560,000
Proceeds from exercise of stock options                 0 300,000 936,000
Purchase of treasury stock                 (467,000) (946,000) (1,795,000)
Excess tax benefit from share-based compensation                 0 162,000 305,000
Cash dividends paid                 (4,176,000) (3,816,000) (3,396,000)
Net cash (used in) provided by financing activities                 (6,143,000) (2,800,000) 24,079,000
Net (decrease) increase in cash and cash equivalents                 (972,000) (80,000) (3,676,000)
Cash and cash equivalents at the beginning of the period       $ 1,099,000       $ 1,179,000 1,099,000 1,179,000 4,855,000
Cash and cash equivalents at the end of the period $ 127,000       $ 1,099,000       $ 127,000 $ 1,099,000 $ 1,179,000