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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, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Cash flows from operating activities: |  |  |  |  |  |  |  |  |  |  |
Net income | $ 6,371 | $ 8,186 | $ 7,684 | $ 8,163 | $ 7,057 | $ 7,610 | $ 7,509 | $ 8,092 | $ 30,404 | $ 30,268 | $ 25,014
Adjustments to reconcile net income to net cash (used in) provided by operating activities: |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation expense |  |  |  |  |  |  |  |  | 3,144 | 3,006 | 2,339
Other, net |  |  |  |  |  |  |  |  | (4,359) | (5,794) | (4,127)
Net cash provided by operating activities |  |  |  |  |  |  |  |  | 42,126 | 48,335 | 38,890
Cash flows from investing activities: |  |  |  |  |  |  |  |  |  |  |
Net decrease (increase) in securities |  |  |  |  |  |  |  |  |  | (82,022) | (124,777)
Net (increase) decrease in loans |  |  |  |  |  |  |  |  | (50,970) | (35,336) | (21,335)
Net increase in payments in excess of funding |  |  |  |  |  |  |  |  | (45,381) | (21,674) | (33,756)
Purchases of premises and equipment, net |  |  |  |  |  |  |  |  | (2,723) | (4,399) | (4,127)
Asset acquisition of Gateway Giving, LLC |  |  |  |  |  |  |  |  | (2,833) |  |
Net cash used in investing activities |  |  |  |  |  |  |  |  | (75,757) | (46,795) | (139,839)
Cash flows from financing activities: |  |  |  |  |  |  |  |  |  |  |
Net (decrease) increase in accounts and drafts payable |  |  |  |  |  |  |  |  | (22,400) | (19,595) | 19,601
Short-term borrowings |  |  |  |  |  |  |  |  | 18,000 |  |
Cash dividends paid |  |  |  |  |  |  |  |  | (15,234) | (13,177) | (10,675)
Purchase of common shares of treasury |  |  |  |  |  |  |  |  | (7,799) | (8,838) | (2,270)
Other financing activities |  |  |  |  |  |  |  |  | (1,125) | (945) | (467)
Net cash provided by financing activities |  |  |  |  |  |  |  |  | 6,652 | 1,283 | 62,316
Net increase (decrease) in cash and cash equivalents |  |  |  |  |  |  |  |  | (26,979) | 2,823 | (38,633)
Cash and cash equivalents at beginning of year |  |  |  | 230,933 |  |  |  | 228,110 | 230,933 | 228,110 | 266,743
Cash and cash equivalents at end of year | 203,954 |  |  |  | 230,933 |  |  |  | 203,954 | 230,933 | 228,110
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |
Cash flows from operating activities: |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | 30,404 | 30,268 | 25,014
Adjustments to reconcile net income to net cash (used in) provided by operating activities: |  |  |  |  |  |  |  |  |  |  |
Equity in undistributed income of subsidiaries |  |  |  |  |  |  |  |  | (15,785) | (15,575) | (11,145)
Net change in other assets |  |  |  |  |  |  |  |  | (6,289) | (1,012) | (7,257)
Net change in other liabilities |  |  |  |  |  |  |  |  | 9,474 | 3,829 | 10,118
Stock-based compensation expense |  |  |  |  |  |  |  |  | 3,144 | 2,583 | 1,743
Other, net |  |  |  |  |  |  |  |  | 6,104 | 10,242 | 9,219
Net cash provided by operating activities |  |  |  |  |  |  |  |  | 27,052 | 30,335 | 27,692
Cash flows from investing activities: |  |  |  |  |  |  |  |  |  |  |
Net decrease (increase) in securities |  |  |  |  |  |  |  |  | 26,150 | 14,615 | (80,621)
Net (increase) decrease in loans |  |  |  |  |  |  |  |  | (24,999) | (7,949) | 34,944
Net increase in payments in excess of funding |  |  |  |  |  |  |  |  | (45,381) | (21,674) | (33,756)
Purchases of premises and equipment, net |  |  |  |  |  |  |  |  | (2,637) | (4,211) | (4,020)
Asset acquisition of Gateway Giving, LLC |  |  |  |  |  |  |  |  | (2,833) |  |
Net cash used in investing activities |  |  |  |  |  |  |  |  | (49,700) | (19,219) | (83,453)
Cash flows from financing activities: |  |  |  |  |  |  |  |  |  |  |
Net (decrease) increase in accounts and drafts payable |  |  |  |  |  |  |  |  | (21,875) | (22,316) | 20,397
Short-term borrowings |  |  |  |  |  |  |  |  | 18,000 |  |
Cash dividends paid |  |  |  |  |  |  |  |  | (15,234) | (13,177) | (10,675)
Purchase of common shares of treasury |  |  |  |  |  |  |  |  | (7,799) | (8,838) | (2,270)
Other financing activities |  |  |  |  |  |  |  |  | (1,125) | (635) | (267)
Net cash provided by financing activities |  |  |  |  |  |  |  |  | (28,033) | (44,966) | 7,185
Net increase (decrease) in cash and cash equivalents |  |  |  |  |  |  |  |  | (50,681) | (33,850) | (48,576)
Cash and cash equivalents at beginning of year |  |  |  | $ 70,936 |  |  |  | $ 104,786 | 70,936 | 104,786 | 153,362
Cash and cash equivalents at end of year | $ 20,255 |  |  |  | $ 70,936 |  |  |  | $ 20,255 | $ 70,936 | $ 104,786

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