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Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Antidilutive Securities Excluded from Computation of Earnings Per Share
Net income	$ 28,931	$ 17,951	$ 14,634	$ 12,868	$ 29,090	$ 29,069	$ 18,424	$ 16,156	$ 74,384	$ 92,739	$ 89,217
Impact of assumed conversions
Weighted average common shares outstanding (in shares)									26,954,000	26,045,000	23,100,000
Additional dilutive common stock equivalents (in shares)									35,000	114,000	189,000
Weighted average diluted common shares outstanding (in shares)									26,989,000	26,159,000	23,289,000
Basic earnings per common share (in dollars per share)	$ 1.00	$ 0.68	$ 0.56	$ 0.49	$ 1.10	$ 1.09	$ 0.69	$ 0.68	$ 2.76	$ 3.56	$ 3.86
Diluted earnings per common share (in dollars per share)	$ 1.00	$ 0.68	$ 0.56	$ 0.48	$ 1.09	$ 1.08	$ 0.68	$ 0.67	$ 2.76	$ 3.55	$ 3.83
Common stock equivalents excluded from earnings per share calculations due to anti-dilutive effect (in shares)									156,000	21,000	0
Convertible Debt Securities
Debt Instrument, Interest Rate, Stated Percentage [Abstract]
Convertible trust preferred securities, interest rate, stated percentage	9.00%				9.00%				9.00%	9.00%	9.00%

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