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Condensed Financial Information - Parent Company Only (Statements Of Cash Flow) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Cash flows from operating activities:              
Net income $ 2,584 $ 3,632 $ 4,311 $ 4,406 $ 14,933 $ 15,153 $ 14,613
Adjustments to reconcile net income to net cash provided by operating activities:              
Depreciation         1,551 1,710 1,629
Recognition of stock based compensation expense         1,114 711 418
Net cash provided by operating activities         16,791 20,331 15,531
Cash flows from investing activities:              
Additional investment in subsidiaties        
Capital expenditures         (4,296) (1,866) (2,002)
Net cash used in investing activities         (181,886) (127,983) (70,150)
Cash flows from financing activities:              
Purchases of treasury stock         (497) (24) (8)
Proceeds from stock option exercises         1,570 1,127 616
Dividend paid         (6,577) (6,040) (5,362)
Net cash used in financing activities         163,814 107,572 55,219
Net (decrease) increase in cash         (1,281) (80) 600
Cash and cash equivalents at beginning of year       9,720 9,720 9,800 9,200
Cash and cash equivalents at end of year 8,439       8,439 9,720 9,800
Parent Company [Member]              
Cash flows from operating activities:              
Net income         14,933 15,153 14,613
Adjustments to reconcile net income to net cash provided by operating activities:              
Depreciation         1 1  
Recognition of stock based compensation expense         1,114 711 418
Net change in other assets         38 (281) (189)
Net change in other liabilities         183 423 415
Equity in undistributed earnings of subsidiaries         (10,380) (11,272) (10,141)
Net cash provided by operating activities         5,889 4,735 5,116
Cash flows from investing activities:              
Capital expenditures         (1) (1) (1)
Net cash used in investing activities         (1) (1) (1)
Cash flows from financing activities:              
Purchases of treasury stock         (497) (24) (8)
Proceeds from stock option exercises         1,570 1,127 616
Dividend paid         (6,577) (6,040) (5,362)
Net cash used in financing activities         (5,504) (4,937) (4,754)
Net (decrease) increase in cash         384 (203) 361
Cash and cash equivalents at beginning of year       $ 918 918 1,121 760
Cash and cash equivalents at end of year $ 1,302       $ 1,302 $ 918 $ 1,121