Parent Company Financial Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Assets
Cash and cash equivalents	$ 127,816	$ 72,873
Other assets	8,044	7,444
Total assets	2,267,195	1,900,614
Liabilities and Shareholders' Equity
Subordinated debentures	35,890	13,403
Shareholders' equity	205,860	173,916	$ 149,686	$ 109,872
Total liabilities and shareholders' equity	2,267,195	1,900,614
Revenues
Interest income	92,652	76,657	61,209
Expenses
Interest expense	25,383	16,505	10,333
Income tax benefit	7,621	6,401	10,616
Net income	27,858	22,289	13,045
Operating activities
Net income	27,858	22,289	13,045
Adjustments to reconcile net income to cash provided by (used for) operating activities
Compensation expense related to stock options and restricted stock grants	1,698	1,502	1,258
(Increase) decrease in other assets	(600)	325	(1,183)
Net cash provided by operating activities	18,282	31,703	17,193
Investing activities
Net cash used for investing activities	(275,583)	(301,708)	(239,015)
Financing activities
Issuance of common stock			(24,758)
Net cash provided by financing activities	312,244	250,713	267,435
Net increase (decrease) in cash and cash equivalents	54,943	(19,292)	45,613
Cash and cash equivalents, beginning of year	72,873	92,165	46,552
Cash and cash equivalents, end of year	127,816	72,873	92,165
Parent Company [Member]
Assets
Cash and cash equivalents	7,753	5,389
Investment in subsidiaries	234,310	181,919
Other assets	6	19
Total assets	242,069	187,327
Liabilities and Shareholders' Equity
Accounts payable and accrued expenses	319	8
Subordinated debentures	35,890	13,403
Shareholders' equity	205,860	173,916
Total liabilities and shareholders' equity	242,069	187,327
Revenues
Interest income	13	9	11
Total revenue	13	9	11
Expenses
Interest expense	929	592	514
Other expenses	240	240	246
Total expenses	1,169	832	760
Income tax benefit	243	173	262
Loss before equity in undistributed net income of subsidiaries	(913)	(650)	(487)
Equity in undistributed net income of subsidiaries	28,771	22,939	13,532
Net income	27,858	22,289	13,045
Operating activities
Net income	27,858	22,289	13,045
Adjustments to reconcile net income to cash provided by (used for) operating activities
Equity in undistributed net income of subsidiaries	(28,771)	(22,939)	(13,532)
Compensation expense related to stock options and restricted stock grants	1,698	1,502	1,258
(Increase) decrease in other assets	12	12	2,772
Increase (decrease) in accounts payable and accrued expenses	(202)	2	2
Net cash provided by operating activities	595	866	3,545
Investing activities
Investment in subsidiaries, net			(27,334)
Net cash used for investing activities			(27,334)
Financing activities
Issuance of common stock			24,758
Proceeds from the exercise of stock options and warrants	1,769	900	705
Net cash provided by financing activities	1,769	900	25,463
Net increase (decrease) in cash and cash equivalents	2,364	1,766	1,674
Cash and cash equivalents, beginning of year	5,389	3,623	1,949
Cash and cash equivalents, end of year	$ 7,753	$ 5,389	$ 3,623