Consolidated Statements of Changes in Shareholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Series A 3% Preferred Stock [Member]	Series B-1 8.48% Preferred Stock [Member]	Preferred Equity [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Retained Earnings [Member] Series A 3% Preferred Stock [Member]	Retained Earnings [Member] Series B-1 8.48% Preferred Stock [Member]	Accumulated Other Comprehensive income [Member]	Treasury Stock [Member]
Balance at Dec. 31, 2021	$ 505,142			$ 17,292	$ 161	$ 126,105	$ 384,007			$ (13,207)	$ (9,216)
Comprehensive income:
Net income	14,983						14,983
Other comprehensive income (loss), net of tax	(53,887)									(53,887)
Purchases of common stock for treasury	(15,026)										(15,026)
Share-based compensation plans:
Share-based compensation	443					443
Restricted stock units released						(667)					667
Cash dividends declared:
Preferred stock dividends per share		$ (1)	$ (364)					$ (1)	$ (364)
Common stock dividends per share	(4,444)						(4,444)
Balance at Mar. 31, 2022	446,846			17,292	161	125,881	394,181			(67,094)	(23,575)
Balance at Dec. 31, 2022	405,605			17,292	161	126,636	421,340			(137,487)	(22,337)
Comprehensive income:
Net income	12,089						12,089
Other comprehensive income (loss), net of tax	10,115									10,115
Purchases of common stock for treasury	(561)										(561)
Share-based compensation plans:
Share-based compensation	551					551
Restricted stock units released						(1,711)					1,711
Cash dividends declared:
Preferred stock dividends per share		$ (1)	$ (364)					$ (1)	$ (364)
Common stock dividends per share	(4,611)						(4,611)
Balance at Mar. 31, 2023	$ 422,823			$ 17,292	$ 161	$ 125,476	$ 428,453			$ (127,372)	$ (21,187)