Quarterly Consolidated Results of Operations (Unaudited) - Summary of the Quarterly Consolidated Results of Operations (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
Quarterly Financial Information Disclosure [Abstract]
Interest income	$ 60,816	$ 60,159	$ 62,449	$ 54,522	$ 36,241	$ 35,683	$ 35,241	$ 33,919	$ 237,946		$ 141,084		$ 124,717
Interest expense	5,849	6,888	8,145	9,059	6,743	6,791	6,252	5,649	29,941		25,435		16,462
Net interest income	54,967	53,271	54,304	45,463	29,498	28,892	28,989	28,270	208,005		115,649		108,255
Credit loss expense - loans and leases	(6,158)	3,658	1,868	43,786	1,084	1,327	282	212	43,154	[1]	2,905	[1]	1,176	[1]
Provision for unfunded commitments/ loan losses	(606)	(864)	1,107	1,459	39	(62)	(85)	87
Net interest income after provision for credit losses	61,731	50,477	51,329	218	28,375	27,627	28,792	27,971	163,755		112,765		106,997
Noninterest income	18,670	25,000	23,015	13,999	11,815	11,842	10,486	10,813	80,684		44,956		39,208
Noninterest expense	41,313	43,563	37,984	42,310	24,720	23,265	24,320	24,779	165,170		97,084		89,330
Income before income taxes	39,088	31,914	36,360	(28,093)	15,470	16,204	14,958	14,005	79,269		60,637		56,875
Income taxes	8,240	6,259	7,303	(5,610)	2,952	3,033	2,759	2,523	16,192		11,267		10,626
Net Income	$ 30,848	$ 25,655	$ 29,057	$ (22,483)	$ 12,518	$ 13,171	$ 12,199	$ 11,482	$ 63,077		$ 49,370		$ 46,249
Earnings per common share:
Basic	$ 0.83	$ 0.69	$ 0.78	$ (0.71)	$ 0.63	$ 0.67	$ 0.62	$ 0.57	$ 1.75		$ 2.49		$ 2.27
Diluted	$ 0.82	$ 0.69	$ 0.78	$ (0.71)	$ 0.63	$ 0.66	$ 0.61	$ 0.57	$ 1.75		$ 2.48		$ 2.26

[1] Beginning January 1, 2020, calculation is based on current expected loss methodology.  Prior to January 1, 2020, calculation was based on incurred loss methodology.