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Earning Per Common Share (Tables)

6 Months Ended

Jun. 30, 2018

Earnings Per Share [Abstract]

Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]

	Quarter Ended June 30,						Six-Month Period Ended June 30,
	2018			2017			2018			2017
	(In thousands, except per share data)
Net income	$	19,649		$	17,104		$	36,566		$	32,254
Less: Dividends on preferred stock
Non-convertible preferred stock (Series A, B, and D)		(1,628)			(1,629)			(3,255)			(3,256)
Convertible preferred stock (Series C)		(1,837)			(1,837)			(3,675)			(3,675)
Income available to common shareholders	$	16,184		$	13,638		$	29,636		$	25,323
Effect of assumed conversion of the convertible preferred stock		1,837			1,837			3,675			3,675
Income available to common shareholders assuming conversion	$	18,021		$	15,475		$	33,311		$	28,998

Weighted average common shares and share equivalents:
Average common shares outstanding		43,975			43,947			43,965			43,931
Effect of dilutive securities:
Average potential common shares-options		113			15			54			24
Average potential common shares-assuming conversion of convertible preferred stock		7,138			7,138			7,138			7,138
Total weighted average common shares outstanding and equivalents		51,226			51,100			51,157			51,093
Earnings per common share - basic	$	0.36		$	0.30		$	0.67		$	0.58
Earnings per common share - diluted	$	0.35		$	0.30		$	0.65		$	0.57