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	126,270							126,772							126,772			(502)
Other comprehensive income (loss)	265,393												265,393		265,393
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)				230
Non-vested shares awarded, net						0
Vesting of non-vested shares (in shares)											72
Vesting of non-vested shares	(5,608)										$ (5,608)				(5,608)
Share-based compensation	6,125					6,125									6,125
Cash dividends on common stock	(71,992)							(71,992)							(71,992)
Capital calls and distributions, net	(194)																	(194)
Balance, end of period (in shares) at Jun. 30, 2020				75,999							5,693
Balance, end of period at Jun. 30, 2020	5,104,423			$ 5		1,357,706		3,737,862			$ (368,894)		370,316		5,096,995			7,428
Balance, beginning of period (in shares) at Mar. 31, 2020				76,001							5,692
Balance, beginning 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
Net income	64,286							64,693							64,693			(407)
Other comprehensive income (loss)	39,024												39,024		39,024
Repurchase of common stock (in shares)											0
Repurchase of common stock	0										$ 0				0
Stock options exercised (in shares)				0
Stock options exercised	0					0									0
Non-vested shares awarded, net (in shares)				(2)
Non-vested shares awarded, net						0
Vesting of non-vested shares (in shares)											1
Vesting of non-vested shares	0										$ 0				0
Share-based compensation	2,880					2,880									2,880
Cash dividends on common stock	(35,850)							(35,850)							(35,850)
Capital calls and distributions, net	(77)																	(77)
Balance, end of period (in shares) at Jun. 30, 2020				75,999							5,693
Balance, end of period at Jun. 30, 2020	5,104,423			$ 5		1,357,706		3,737,862			$ (368,894)		370,316		5,096,995			7,428
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	311,415							312,481							312,481			(1,066)
Other comprehensive income (loss)	(109,100)												(109,100)		(109,100)
Repurchase of common stock (in shares)											753
Repurchase of common stock	(63,868)										$ (63,868)				(63,868)
Stock options exercised (in shares)				17
Stock options exercised	949					949									949
Non-vested shares awarded, net (in shares)				246
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	4,090					4,090									4,090
Cash dividends on common stock	(72,026)							(72,026)							(72,026)
Capital calls and distributions, net	(2,655)																	(2,655)
Balance, end of period (in shares) at Jun. 30, 2021				76,258							7,179
Balance, end of period at Jun. 30, 2021	5,354,551			$ 5		1,373,101		4,214,130			$ (481,027)		226,768		5,332,977			21,574
Balance, beginning of period (in shares) at Mar. 31, 2021				76,244							6,686
Balance, beginning 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
Net income	167,107							166,421							166,421			686
Other comprehensive income (loss)	5,359												5,359		5,359
Repurchase of common stock (in shares)											493
Repurchase of common stock	(43,797)										$ (43,797)				(43,797)
Stock options exercised (in shares)				0
Stock options exercised	0					0									0
Non-vested shares awarded, net (in shares)				14
Non-vested shares awarded, net						0
Vesting of non-vested shares (in shares)											0
Vesting of non-vested shares	0										$ 0				0
Share-based compensation	1,366					1,366									1,366
Cash dividends on common stock	(35,834)							(35,834)							(35,834)
Capital calls and distributions, net	(1,994)																	(1,994)
Balance, end of period (in shares) at Jun. 30, 2021				76,258							7,179
Balance, end of period at Jun. 30, 2021	$ 5,354,551			$ 5		$ 1,373,101		$ 4,214,130			$ (481,027)		$ 226,768		$ 5,332,977			$ 21,574