Consolidated Statements of Changes in Equity (Unaudited) - USD ($) shares in Thousands, $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjusted Balance	Cumulative Effect, Period of Adoption, Adjustment	Common Stock [Member]	Common Stock [Member] Cumulative Effect, Period of Adoption, Adjusted Balance	Capital Surplus [Member]	Capital Surplus [Member] Cumulative Effect, Period of Adoption, Adjusted Balance	Retained Earnings [Member]	Retained Earnings [Member] Cumulative Effect, Period of Adoption, Adjusted Balance	Retained Earnings [Member] Cumulative Effect, Period of Adoption, Adjustment	Treasury Stock [Member]	Treasury Stock [Member] Cumulative Effect, Period of Adoption, Adjusted Balance	Accumulated Other Comprehensive Income (Loss) [Member]	Accumulated Other Comprehensive Income (Loss) [Member] Cumulative Effect, Period of Adoption, Adjusted Balance	Total Shareholders' Equity [Member]	Total Shareholders' Equity [Member] Cumulative Effect, Period of Adoption, Adjusted Balance	Total Shareholders' Equity [Member] Cumulative Effect, Period of Adoption, Adjustment	Non-Controlling Interests [Member]	Non-Controlling Interests [Member] Cumulative Effect, Period of Adoption, Adjusted Balance
Balance, beginning of period (in shares) at Dec. 31, 2019				75,759	75,759						5,179	5,179
Balance, beginning of period at Dec. 31, 2019	$ 4,863,919	$ 4,817,223		$ 5	$ 5	$ 1,350,995	$ 1,350,995	$ 3,729,778	$ 3,683,082		$ (329,906)	$ (329,906)	$ 104,923	$ 104,923	$ 4,855,795	$ 4,809,099		$ 8,124	$ 8,124
Balance, beginning of period (Accounting Standards Update 2016-13) at Dec. 31, 2019			$ (46,696)							$ (46,696)							$ (46,696)
Net income	61,984							62,079							62,079			(95)
Other comprehensive income (loss)	226,369												226,369		226,369
Repurchase of common stock (in shares)											442
Repurchase of common stock	(33,380)										$ (33,380)				(33,380)
Stock options exercised (in shares)				10
Stock options exercised	586					586									586
Non-vested shares awarded, net (in shares)				232
Non-vested shares awarded, net						0
Vesting of non-vested shares (in shares)											71
Vesting of non-vested shares	(5,608)										$ (5,608)				(5,608)
Share-based compensation	3,245					3,245									3,245
Cash dividends on common stock	(36,142)							(36,142)							(36,142)
Capital calls and distributions, net	(117)																	(117)
Balance, end of period (in shares) at Mar. 31, 2020				76,001							5,692
Balance, end of period at Mar. 31, 2020	5,034,160			$ 5		1,354,826		3,709,019			$ (368,894)		331,292		5,026,248			7,912
Balance, beginning of period (in shares) at Dec. 31, 2020				75,995							6,358
Balance, beginning of period at Dec. 31, 2020	5,291,561			$ 5		1,368,062		3,973,675			$ (411,344)		335,868		5,266,266			25,295
Net income	144,308							146,060							146,060			(1,752)
Other comprehensive income (loss)	(114,459)												(114,459)		(114,459)
Repurchase of common stock (in shares)											260
Repurchase of common stock	(20,071)										$ (20,071)				(20,071)
Stock options exercised (in shares)				17
Stock options exercised	949					949									949
Non-vested shares awarded, net (in shares)				232
Non-vested shares awarded, net						0
Vesting of non-vested shares (in shares)											68
Vesting of non-vested shares	(5,815)										$ (5,815)				(5,815)
Share-based compensation	2,724					2,724									2,724
Cash dividends on common stock	(36,192)							(36,192)							(36,192)
Capital calls and distributions, net	(661)																	(661)
Balance, end of period (in shares) at Mar. 31, 2021				76,244							6,686
Balance, end of period at Mar. 31, 2021	$ 5,262,344			$ 5		$ 1,371,735		$ 4,083,543			$ (437,230)		$ 221,409		$ 5,239,462			$ 22,882