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Condensed Financial Information of Parent Company (Schedule of 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
Cash flows from operating activities:                      
Net income $ 6,089 $ 5,880 $ 5,548 $ 5,539 $ 5,786 $ 6,401 $ 6,035 $ 5,811 $ 23,056 $ 24,033 $ 23,497
Adjustments to reconcile net income to net cash provided by (used in) operating activities:                      
Net cash provided by operating activities                 33,493 34,843 28,886
Cash flows from investing activities:                      
Net increase in securities                 (161,279) (54,054) (104,351)
Net decrease in loans                 10,882 (16,954) 34,378
Purchases of premises and equipment, net                 (5,747) (6,291) (4,857)
Net cash (used in) provided by investing activities                 (3,636) (100,949) 24,901
Cash flows from financing activities:                      
Net (decrease) increase in accounts and drafts payable                 (78,169) 111,475 21,192
Cash dividends paid                 (9,697) (9,337) $ (8,510)
Purchase of common shares of treasury                 (10,951) (1,848)
Other financing activities                 (488) (814) $ (1,083)
Net cash (used in) provided by financing activities                 (71,020) 135,179 30,387
Net (decrease) increase in cash and cash equivalents                 (41,163) 69,073 84,174
Cash and cash equivalents at beginning of year       294,335       225,262 294,335 225,262 141,088
Cash and cash equivalents at end of year 253,172       294,335       253,172 294,335 225,262
Parent Company [Member]                      
Cash flows from operating activities:                      
Net income                 23,056 24,033 23,497
Adjustments to reconcile net income to net cash provided by (used in) operating activities:                      
Equity in undistributed income of subsidiaries                 (7,889) (7,164) (7,530)
Net change in other assets                 16,100 (44,879) (8,420)
Net change in other liabilities                 (2,779) 534 (2,729)
Amortization of stock-based awards                 1,504 1,250 1,177
Other, net                 10,389 13,487 (4,180)
Net cash provided by operating activities                 40,381 (12,739) 1,815
Cash flows from investing activities:                      
Net increase in securities                 (23,472) (35,128) (15,385)
Net decrease in loans                 28,343 9,358 31,619
Purchases of premises and equipment, net                 (5,708) (8,941) (4,050)
Net cash (used in) provided by investing activities                 (837) (34,711) 12,184
Cash flows from financing activities:                      
Net (decrease) increase in accounts and drafts payable                 (78,439) 111,405 21,192
Cash dividends paid                 (9,697) (9,337) $ (8,510)
Purchase of common shares of treasury                 (10,951) (1,848)
Other financing activities                 66 (21) $ (513)
Net cash (used in) provided by financing activities                 (99,021) 100,199 12,169
Net (decrease) increase in cash and cash equivalents                 (59,477) 52,749 26,168
Cash and cash equivalents at beginning of year       $ 140,331       $ 87,582 140,331 87,582 61,414
Cash and cash equivalents at end of year $ 80,854       $ 140,331       $ 80,854 $ 140,331 $ 87,582