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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

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