Parent Company Statements - Condensed Cash Flow Statement (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Operating activities:
Net income	$ 30,848	$ 25,655	$ 29,057	$ (22,483)	$ 12,518	$ 13,171	$ 12,199	$ 11,482	$ 63,077	$ 49,370	$ 46,249
Adjustments to reconcile net income to net cash (used in) provided by operating activities:
Net cash provided by operating activities									(55,618)	39,685	53,055
Investing activities:
Purchases of equity securities									(1,000)
Net cash used in investing activities									(541,854)	(225,348)	(213,024)
Financing activities:
Repurchase of common stock									(10,183)	(15,147)	(6,330)
Proceeds from subordinated debentures									48,777
Stock Options Exercised										189	111
Direct stock sales									18	123	104
Net cash provided by financing activities									625,484	217,955	145,238
Parent Company [Member]
Operating activities:
Net income									63,077	49,370	46,249
Adjustments to reconcile net income to net cash (used in) provided by operating activities:
Undistributed equity in earnings of subsidiaries									(38,829)	(12,852)	(23,379)
Change in other assets and liabilities									1,630	(201)	(419)
Net cash provided by operating activities									25,878	36,317	22,451
Investing activities:
Net Cash received for United Community Financial Corp.									9,414
Purchases of equity securities									(1,000)
Net cash used in investing activities									8,414
Financing activities:
Repurchase of common stock									(10,183)	(15,147)	(6,330)
Cash dividends paid									(32,898)	(15,624)	(13,043)
Proceeds from subordinated debentures									48,777
Stock Options Exercised										189	111
Direct stock sales									18	123	104
Net cash provided by financing activities									5,714	(30,459)	(19,158)
Net increase (decrease) in cash and cash equivalents									40,006	5,858	3,293
Cash and cash equivalents at beginning of year				$ 18,011				$ 12,153	18,011	12,153	8,860
Cash and cash equivalents at end of year	$ 58,017				$ 18,011				$ 58,017	$ 18,011	$ 12,153