Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Common Stock	Preferred Stock 8% Preferred Stock	Preferred Stock 7% Preferred Stock	Preferred Stock 6% Preferred Stock	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	7% Preferred Stock	6% Preferred Stock	Total
Balance at beginning of the period at Dec. 31, 2016	$ 20,061	$ 41,581			$ 145,274	$ (628)			$ 206,288
Balance at beginning of the period (in shares) at Dec. 31, 2016	21,111,200	41,625
Condensed Consolidated Statements of Shareholders’ Equity
Net income					54,684				54,684
Shares issued for stock compensation plans	$ 458								458
Shares issued for stock compensation plans (in shares)	3,196
Shares issued for MCS acquisition	$ 8,127								8,127
Shares issued for MCS acquisition (in shares)	383,271
Issuance of shares	$ 106,245								106,245
Issuance of shares (in shares)	7,187,500
Dividends on preferred stock, annually					(3,330)				(3,330)
Dividends on common stock, annually					(4,620)				(4,620)
Other comprehensive income (loss)						(378)			(378)
Balance at end of the period at Dec. 31, 2017	$ 134,891	$ 41,581			192,008	(1,006)			367,474
Balance at end of the period (in shares) at Dec. 31, 2017	28,685,167	41,625
Condensed Consolidated Statements of Shareholders’ Equity
Net income					62,874				62,874
Shares issued for stock compensation plans	$ 166								166
Shares issued for stock compensation plans (in shares)	8,869
Dividends on preferred stock, annually					(3,330)				(3,330)
Dividends on common stock, annually					(6,886)				(6,886)
Reclassification of deferred tax asset due to tax reform					243	(243)
Other comprehensive income (loss)						939			939
Balance at end of the period at Dec. 31, 2018	$ 135,057	$ 41,581			244,909	(310)			421,237
Balance at end of the period (in shares) at Dec. 31, 2018	28,694,036	41,625
Condensed Consolidated Statements of Shareholders’ Equity
Net income					77,329				77,329
Shares issued for stock compensation plans	$ 583								583
Shares issued for stock compensation plans (in shares)	12,402
Issuance of shares			$ 72,071	$ 120,844			$ 72,071	$ 120,844
Issuance of shares (in shares)			2,955,800	125,000
Repurchase of Preferred Stock			$ (21,850)				$ (21,850)
Repurchase of Preferred Stock (in shares)			(874,000)
Dividends on 8% preferred stock, annually					(3,330)				(3,330)
Dividends on 7% preferred stock, annually, pro-rated					(3,115)				(3,115)
Dividends on 6% preferred stock, annually, pro-rated					(2,771)				(2,771)
Dividends on common stock, annually					(8,038)				(8,038)
Other comprehensive income (loss)						768			768
Balance at end of the period at Dec. 31, 2019	$ 135,640	$ 41,581	$ 50,221	$ 120,844	$ 304,984	$ 458			$ 653,728
Balance at end of the period (in shares) at Dec. 31, 2019	28,706,438	41,625	2,081,800	125,000