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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, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Cash flows from operating activities:                      
Net income $ 7,057 $ 7,610 $ 7,509 $ 8,092 $ 5,331 $ 6,863 $ 6,513 $ 6,307 $ 30,268 $ 25,014 $ 24,348
Adjustments to reconcile net income to net cash (used in) provided by operating activities:                      
Net cash provided by operating activities                 48,335 38,890 35,189
Cash flows from investing activities:                      
Net decrease (increase) in securities                 (82,022) (124,777) (96,290)
Net (increase) decrease in loans                 (35,336) (21,335) (5,771)
Purchases of premises and equipment, net                 (4,399) (4,127) (4,684)
Net cash used in investing activities                 (46,795) (139,839) (41,551)
Cash flows from financing activities:                      
Net increase in accounts and drafts payable                 (19,595) 19,601 65,028
Cash dividends paid                 (13,177) (10,675) (9,979)
Purchase of common shares of treasury                 (8,838) (2,270) (9,215)
Other financing activities                 (945) (467) (1,378)
Net cash provided by financing activities                 1,283 62,316 19,933
Net increase (decrease) in cash and cash equivalents                 2,823 (38,633) 13,571
Cash and cash equivalents at beginning of year       228,110       266,743 228,110 266,743 253,172
Cash and cash equivalents at end of year 230,933       228,110       230,933 228,110 266,743
Parent Company [Member]                      
Cash flows from operating activities:                      
Net income                 30,268 25,014 24,348
Adjustments to reconcile net income to net cash (used in) provided by operating activities:                      
Equity in undistributed income of subsidiaries                 (15,575) (11,145) (10,059)
Net change in other assets                 (76,686) (41,013) (7,085)
Net change in other liabilities                 3,829 10,118 6,683
Amortization of stock-based awards                 2,583 1,743 1,677
Other, net                 10,242 9,219 7,558
Net cash provided by operating activities                 (45,339) (6,064) 23,122
Cash flows from investing activities:                      
Net decrease (increase) in securities                 14,615 (80,621) (33,025)
Net (increase) decrease in loans                 (7,949) 34,944 40,431
Purchases of premises and equipment, net                 (4,211) (4,020) (4,557)
Net cash used in investing activities                 2,455 (49,697) 2,849
Cash flows from financing activities:                      
Net increase in accounts and drafts payable                 31,684 20,397 64,026
Cash dividends paid                 (13,177) (10,675) (9,979)
Purchase of common shares of treasury                 (8,838) (2,270) (9,215)
Other financing activities                 (635) (267) 1,705
Net cash provided by financing activities                 9,034 7,185 46,537
Net increase (decrease) in cash and cash equivalents                 (33,850) (48,576) 72,508
Cash and cash equivalents at beginning of year       $ 104,786       $ 153,362 104,786 153,362 80,854
Cash and cash equivalents at end of year $ 70,936       $ 104,786       $ 70,936 $ 104,786 $ 153,362