CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($)	Total	Common Stock [Member]	Common Stock Including Additional Paid in Capital [Member]	Retained Earnings (Accumulated Deficit) [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Balance, beginning of the period, shares at Dec. 31, 2020		35,159,200
Balance, beginning of the period at Dec. 31, 2020	$ 1,666,264,000		$ 1,349,879,000	$ 247,316,000	$ 69,069,000
Net income	201,048,000			201,048,000
Other comprehensive income (loss)	(68,885,000)				(68,885,000)
Accrual of dividends on common stock	(57,602,000)			(57,602,000)
Stock Repurchased and Retired During Period, Shares		1,050,000
Cash paid for repurchase of common stock	(56,528,000)		(56,528,000)
Issuance of unvested restricted common stock, net, shares		143,432
Amortization of share-based compensation related to restricted stock grants, net of shares surrendered	6,030,000		6,030,000
Balance, end of the period, shares at Dec. 31, 2021		34,252,632
Balance, end of the period at Dec. 31, 2021	1,690,327,000		1,299,381,000	390,762,000	184,000
Net income	195,378,000			195,378,000
Other comprehensive income (loss)	(362,953,000)				(362,953,000)
Accrual of dividends on common stock	(60,898,000)			(60,898,000)
Stock Repurchased and Retired During Period, Shares		200,000
Cash paid for repurchase of common stock	(10,960,000)		(10,960,000)
Issuance of unvested restricted common stock, net, shares		141,386
Amortization of share-based compensation related to restricted stock grants, net of shares surrendered	5,538,000		5,538,000
Balance, end of the period, shares at Dec. 31, 2022		34,194,018
Balance, end of the period at Dec. 31, 2022	1,456,432,000		1,293,959,000	525,242,000	(362,769,000)
Net income	183,624,000			183,624,000
Other comprehensive income (loss)	73,634,000				73,634,000
Accrual of dividends on common stock	(66,691,000)			(66,691,000)
Cash paid for repurchase of common stock	0
Issuance of unvested restricted common stock, net, shares		154,351
Amortization of share-based compensation related to restricted stock grants, net of shares surrendered	5,692,000		5,692,000
Balance, end of the period, shares at Dec. 31, 2023		34,348,369
Balance, end of the period at Dec. 31, 2023	$ 1,652,691,000		$ 1,299,651,000	$ 642,175,000	$ (289,135,000)