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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, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Cash flows from operating activities: |  |  |  |  |  |  |  |  |  |  |
Net income | $ 6,424 | $ 6,222 | $ 5,869 | $ 5,833 | $ 6,089 | $ 5,880 | $ 5,548 | $ 5,539 | $ 24,348 | $ 23,056 | $ 24,033
Adjustments to reconcile net income to net cash provided by (used in) operating activities: |  |  |  |  |  |  |  |  |  |  |
Net cash provided by (used in) operating activities |  |  |  |  |  |  |  |  | 35,189 | 33,493 | 34,843
Cash flows from investing activities: |  |  |  |  |  |  |  |  |  |  |
Net increase in securities |  |  |  |  |  |  |  |  | (96,290) | (161,279) | (54,054)
Net decrease in loans |  |  |  |  |  |  |  |  | (5,771) | 10,882 | (16,954)
Purchases of premises and equipment, net |  |  |  |  |  |  |  |  | (4,684) | (5,747) | (6,291)
Net cash used in investing activities |  |  |  |  |  |  |  |  | (41,551) | (3,636) | (100,949)
Cash flows from financing activities: |  |  |  |  |  |  |  |  |  |  |
Net increase (decrease) in accounts and drafts payable |  |  |  |  |  |  |  |  | 65,028 | (78,169) | 111,475
Cash dividends paid |  |  |  |  |  |  |  |  | (9,979) | (9,697) | (9,337)
Purchase of common shares of treasury |  |  |  |  |  |  |  |  | (9,215) | (10,951) | (1,848)
Other financing activities |  |  |  |  |  |  |  |  | (1,378) | (488) | (814)
Net cash provided by (used in) financing activities |  |  |  |  |  |  |  |  | 19,933 | (71,020) | 135,179
Net increase (decrease) in cash and cash equivalents |  |  |  |  |  |  |  |  | 13,571 | (41,163) | 69,073
Cash and cash equivalents at beginning of year |  |  |  | 253,172 |  |  |  | 294,335 | 253,172 | 294,335 | 225,262
Cash and cash equivalents at end of year | 266,743 |  |  |  | 253,172 |  |  |  | 266,743 | 253,172 | 294,335
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |
Cash flows from operating activities: |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | 24,348 | 23,056 | 24,033
Adjustments to reconcile net income to net cash provided by (used in) operating activities: |  |  |  |  |  |  |  |  |  |  |
Equity in undistributed income of subsidiaries |  |  |  |  |  |  |  |  | (10,059) | (7,889) | (7,164)
Net change in other assets |  |  |  |  |  |  |  |  | (7,085) | 16,100 | (44,879)
Net change in other liabilities |  |  |  |  |  |  |  |  | 6,683 | (2,779) | 534
Amortization of stock-based awards |  |  |  |  |  |  |  |  | 1,677 | 1,504 | 1,250
Other, net |  |  |  |  |  |  |  |  | 7,558 | 10,389 | 13,487
Net cash provided by (used in) operating activities |  |  |  |  |  |  |  |  | 23,122 | 40,381 | (12,739)
Cash flows from investing activities: |  |  |  |  |  |  |  |  |  |  |
Net increase in securities |  |  |  |  |  |  |  |  | (33,025) | (23,472) | (35,128)
Net decrease in loans |  |  |  |  |  |  |  |  | 40,431 | 28,343 | 9,358
Purchases of premises and equipment, net |  |  |  |  |  |  |  |  | (4,557) | (5,708) | (8,941)
Net cash used in investing activities |  |  |  |  |  |  |  |  | 2,849 | (837) | (34,711)
Cash flows from financing activities: |  |  |  |  |  |  |  |  |  |  |
Net increase (decrease) in accounts and drafts payable |  |  |  |  |  |  |  |  | 64,026 | (78,439) | 111,405
Cash dividends paid |  |  |  |  |  |  |  |  | (9,979) | (9,697) | (9,337)
Purchase of common shares of treasury |  |  |  |  |  |  |  |  | (9,215) | (10,951) | (1,848)
Other financing activities |  |  |  |  |  |  |  |  | 1,705 | 66 | (21)
Net cash provided by (used in) financing activities |  |  |  |  |  |  |  |  | 46,537 | (99,021) | 100,199
Net increase (decrease) in cash and cash equivalents |  |  |  |  |  |  |  |  | 72,508 | (59,477) | 52,749
Cash and cash equivalents at beginning of year |  |  |  | $ 80,854 |  |  |  | $ 140,331 | 80,854 | 140,331 | 87,582
Cash and cash equivalents at end of year | $ 153,362 |  |  |  | $ 80,854 |  |  |  | $ 153,362 | $ 80,854 | $ 140,331

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