| Condensed Financial Information of Parent Company Only Disclosure [Text Block] |
Note 28 - Parent Company-Only Financial Statements The condensed financial statements of the Corporation (parent company only) are presented below. These statements should be read in conjunction with the Notes to the Consolidated Financial Statements. A. Condensed Balance Sheets | | | | | | | | | | | | | | | | | | | | | | | | | $ | 23,663 | | | $ | 37,992 | | | | | | 400 | | | | 404 | | Investments in subsidiaries, as equity in net assets | | | 384,751 | | | | 354,148 | | Premises and equipment, net | | | 2,288 | | | | 2,386 | | | | | | 245 | | | | 245 | | | | | | 1,435 | | | | 1,704 | | | | | $ | 412,782 | | | $ | 396,879 | | Liabilities and shareholders’ equity: | | | | | | | | | | | | $ | — | | | $ | — | | | | | | 29,532 | | | | 29,479 | | | | | | 2,123 | | | | 1,689 | | | | | $ | 31,655 | | | $ | 31,168 | | Common stock, par value $1, authorized 100,000,000 shares issued 21,110,968 shares and 20,931,416 shares as of December 31, 2016 and 2015, respectively, and outstanding 16,939,715 shares and 17,071,523 shares as of December 31, 2016 and 2015, respectively | | $ | 21,111 | | | $ | 20,931 | | Paid-in capital in excess of par value | | | 232,806 | | | | 228,814 | | Less common stock in treasury, at cost – 4,171,253 shares and 3,859,893 shares as of December 31, 2016 and 2015, respectively | | | (66,950 | | | | (58,144 | | Accumulated other comprehensive loss, net of deferred income taxes benefit | | | (2,409 | | | | (412 | | | | | | 196,569 | | | | 174,522 | | Total shareholders’ equity | | $ | 381,127 | | | $ | 365,711 | | Total liabilities and shareholders’ equity | | $ | 412,782 | | | $ | 396,879 | | B. Condensed Statements of Income | | Twelve Months Ended December 31, | | | | | | | | | | | | | Dividends from subsidiaries | | $ | 17,718 | | | $ | 34,234 | | | $ | 12,160 | | Interest and other income | | | 2,714 | | | | 2,128 | | | | 2,156 | | | | | | 20,432 | | | | 36,362 | | | | 14,316 | | | | | | 2,443 | | | | 2,140 | | | | 1,849 | | Income before equity in undistributed income of subsidiaries | | | 17,989 | | | | 34,222 | | | | 12,467 | | Equity in undistributed income of subsidiaries | | | 17,600 | | | | (17,427 | | | | 15,480 | | Income before income taxes | | | 35,589 | | | | 16,795 | | | | 27,947 | | Income tax (benefit) expense | | | (447 | | | | 41 | | | | 104 | | | | | $ | 36,036 | | | $ | 16,754 | | | $ | 27,843 | | C. Condensed Statements of Cash Flows | | Twelve Months Ended December 31, | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | $ | 36,036 | | | $ | 16,754 | | | $ | 27,843 | | Adjustments to reconcile net income to net cash provided by operating activities: | | | | | | | | | | | | | Equity in undistributed income of subsidiaries | | | (17,600 | | | | 17,427 | | | | (15,480 | | Depreciation and amortization | | | 151 | | | | 121 | | | | 98 | | Stock-based compensation cost | | | 1,713 | | | | 1,441 | | | | 1,256 | | | | | | 1,000 | | | | 508 | | | | 485 | | Net cash provided by operating activities | | | 21,300 | | | | 36,251 | | | | 14,202 | | | | | | | | | | | | | | | | Investment in subsidiaries | | | (15,000 | | | | — | | | | — | | Proceeds from sale investments | | | — | | | | 16 | | | | — | | Acquisitions, net of cash acquired | | | — | | | | 128 | | | | — | | Net cash (used in) provid ed by investing activities | | | (15,000 | | | | 144 | | | | — | | | | | | | | | | | | | | | | | | | | (13,961 | | | | (13,837 | | | | (10,189 | | Change in other borrowings | | | — | | | | — | | | | (7,050 | | Proceeds from issuance of subordinated notes | | | — | | | | 29,456 | | | | — | | Net (purchase of) proceeds from sale of treasury stock for deferred compensation plans | | | (133 | | | | (128 | | | | 79 | | Net purchase of treasury stock through publicly announced plans | | | (7,971 | | | | (26,418 | | | | (947 | | Proceeds from issuance of common stock | | | — | | | | 20 | | | | 72 | | Payment of contingent consideration for business combinations | | | — | | | | — | | | | — | | Excess tax benefit from stock-based compensation | | | — | | | | 783 | | | | 831 | | Cash payments to taxing authorities on employees' behalf from shares withheld from stock-based compensation | | | (745 | | | | — | | | | — | | Proceeds from exercise of stock options | | | 2,181 | | | | 6,452 | | | | 2,836 | | Net cash used by financing activities | | | (20,629 | | | | (3,672 | | | | (14,368 | | Change in cash and cash equivalents | | | (14,329 | | | | 32,723 | | | | (166 | | Cash and cash equivalents at beginning of period | | | 37,992 | | | | 5,269 | | | | 5,435 | | Cash and cash equivalents at end of period | | $ | 23,663 | | | $ | 37,992 | | | $ | 5,269 | |
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