Net Income Per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Numerator for basic earnings per share:
Net income from continuing operations	$ 18,034	$ 14,931	$ 19,082	$ 18,123
Less: Dividends on preferred stock	115	122	229	243
Net income from continuing operations available to common shareholders - basic	17,919	14,809	18,853	17,880
Net income from discontinued operations available to common shareholders - basic and diluted	0	446	0	446
Net income available to common shareholders - basic	17,919	15,255	18,853	18,326
Numerator for diluted earnings per share:
Add: Dividends on convertible preferred stock	0	122	0	243
Add: Interest on subordinated debt (tax effected)	0	174	0	346
Net income from continuing operations available to common shareholders - diluted	$ 17,919	$ 15,105	$ 18,853	$ 18,469
Denominator:
Total average shares outstanding (in shares)	11,954,813	11,644,061	11,948,790	11,625,903
Effect of dilutive convertible preferred stock (in shares)	0	489,625	0	489,625
Effect of dilutive convertible subordinated debt (in shares)	0	775,000	0	775,000
Effect of dilutive stock options and restricted stock units (in shares)	57,032	246,616	207,424	249,084
Total diluted average shares outstanding (in shares)	12,011,845	13,155,302	12,156,214	13,139,612
Earnings per share from continuing operations - basic (in dollars per share)	$ 1.50	$ 1.27	$ 1.58	$ 1.54
Earnings per share from discontinued operations - basic (in dollars per share)	0	0.04	0	0.04
Earnings per share - basic (in dollars per share)	1.50	1.31	1.58	1.58
Earnings per share from continuing operations - diluted (in dollars per share)	1.49	1.15	1.55	1.41
Earnings per share from discontinued operations - diluted (in dollars per share)	0	0.03	0	0.03
Earnings per share - diluted (in dollars per share)	$ 1.49	$ 1.18	$ 1.55	$ 1.44
Stock option
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded form computation of earnings per share (in shares)	859,000	386,000	859,000	386,000
Restricted Stock Units (RSUs)
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded form computation of earnings per share (in shares)	218,000	142,000	192,000	142,000