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Condensed Parent Only Financial Information Condensed Statements of Cash Flows (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Net Cash Provided by (Used in) Operating Activities                      
Net income $ 4,083 $ 4,381 $ 3,858 $ 4,192 $ 3,744 $ 3,553 $ 3,505 $ 3,337 $ 16,514 $ 14,139 $ 13,746
Equity in undistributed earnings of consolidated subsidiaries                 (481) (774) 437
Share-based compensation                 1,063 887 660
Excess tax benefit from share-based compensation                 (267) (584) (365)
Increase in other liabilities                 1,269 2,390 (3,681)
Other, net                 (1,033) (5,448) 2,713
Net cash provided by (used in) operating activities                 23,220 11,874 15,902
Net Cash Provided by (Used in) Investing Activities                      
Net cash (used in) provided by investing activities                 (149,585) (332,749) (54,916)
Net Cash Provided by (Used in) Financing Activities                      
Net increase (decrease) in short-term borrowed funds                 1,500 1,000 0
Proceeds from issuance of long-term debt, net of issuance costs                 0 14,469 0
Repayment of long-term debt                 0 (4,000) 0
Proceeds from issuance of common stock                 0 16,557 0
Proceeds from exercise of stock options                 300 936 1,474
Purchase of treasury stock                 (946) (1,795) (1,782)
Excess tax benefit from share-based compensation                 267 584 365
Dividends paid                 (3,816) (3,396) (2,475)
Net cash provided by (used in) financing activities                 136,692 342,826 34,714
Net (decrease) increase in cash and cash equivalents                 10,327 21,951 (4,300)
Cash and cash equivalents at the beginning of the period       103,237       81,286 103,237 81,286 85,586
Cash and cash equivalents at the end of the period 113,564       103,237       113,564 103,237 81,286
Parent company                      
Net Cash Provided by (Used in) Operating Activities                      
Net income                 16,514 14,139 13,746
Equity in undistributed earnings of consolidated subsidiaries                 (20,185) (17,185) (15,434)
Share-based compensation                 448 416 311
Excess tax benefit from share-based compensation                 (162) (305) (145)
Increase in other liabilities                 2,390 1,002 867
Other, net                 (319) (842) (34)
Net cash provided by (used in) operating activities                 (1,314) (2,775) (689)
Net Cash Provided by (Used in) Investing Activities                      
Dividends received from subsidiaries                 7,034 8,000 8,000
Capital contributions to subsidiaries                 (3,000) (32,980) (850)
Net cash (used in) provided by investing activities                 4,034 (24,980) 7,150
Net Cash Provided by (Used in) Financing Activities                      
Net increase (decrease) in short-term borrowed funds                 1,500 1,000 0
Proceeds from issuance of long-term debt, net of issuance costs                 0 14,469 0
Repayment of long-term debt                 0 (4,000) 0
Proceeds from issuance of common stock                 0 16,560 0
Proceeds from exercise of stock options                 300 936 1,474
Purchase of treasury stock                 (946) (1,795) (1,782)
Excess tax benefit from share-based compensation                 162 305 145
Dividends paid                 (3,816) (3,396) (2,475)
Net cash provided by (used in) financing activities                 (2,800) 24,079 (2,638)
Net (decrease) increase in cash and cash equivalents                 (80) (3,676) 3,823
Cash and cash equivalents at the beginning of the period       $ 1,179       $ 4,855 1,179 4,855 1,032
Cash and cash equivalents at the end of the period $ 1,099       $ 1,179       $ 1,099 $ 1,179 $ 4,855