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Condensed Financial Information of First Commonwealth Financial Corporation (parent company only) - Statements of Cash Flow (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Operating Activities |  |  |
Net Income | $ 73,447 | $ 105,333 | $ 107,498
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation and amortization | 11,653 | 10,370 | 8,046
Other net | 5,349 | (14,310) | 11,695
Net cash provided by operating activities | 105,699 | 107,632 | 135,263
Investing Activities |  |  |
Net cash (used in) provided by investing activities | (483,138) | 122,942 | (347,748)
Financing Activities |  |  |
Dividends paid | (42,982) | (39,394) | (34,849)
Proceeds from reissuance of treasury stock | 222 | 211 | 208
Purchase of treasury stock | (20,905) | (6,259) | (26,189)
Net cash provided by (used in) financing activities | 612,164 | (207,665) | 204,140
Parent Company [Member] |  |  |
Operating Activities |  |  |
Net Income | 73,447 | 105,333 | 107,498
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation and amortization | 383 | 340 | 320
Net gains on sales of assets | 0 | (2) | (7)
Decrease (increase) in prepaid income taxes | (317) | 629 | 37
Undistributed equity in subsidiaries | (17,996) | (55,895) | (32,077)
Proceeds from Equity Method Investment, Distribution | 0 | 0 | 9,000
Other net | 19,705 | (2,957) | (1,628)
Net cash provided by operating activities | 75,222 | 47,448 | 83,143
Investing Activities |  |  |
Net change in loans | 1 | 1 | 3
Payments to Acquire Property and Equipment | (20) | (586) | (87)
Proceeds from sale of other assets | 0 | 2 | 7
Payments to Acquire Additional Interest in Subsidiaries | 0 | 0 | (17,202)
Net cash (used in) provided by investing activities | (19) | (583) | (17,279)
Financing Activities |  |  |
Dividends paid | (42,982) | (39,394) | (34,849)
Proceeds from reissuance of treasury stock | 222 | 211 | 208
Purchase of treasury stock | (20,905) | (6,259) | (26,189)
Net cash provided by (used in) financing activities | (63,665) | (45,442) | (60,830)
Net (decrease) increase in cash and cash equivalents | 11,538 | 1,423 | 5,034
Cash and cash equivalents at January 1 | 22,889 | 21,466 | 16,432
Cash and cash equivalents at December 31 | $ 34,427 | $ 22,889 | $ 21,466

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