Quarterly Condensed Financial Information (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Quarterly Condensed Financial Information (Unaudited)
Interest income	$ 63,799	$ 59,761	$ 48,761	$ 39,674	$ 39,825	$ 37,577	$ 34,123	$ 29,038	$ 211,995	$ 140,563	$ 94,387
Interest expense	26,178	27,137	20,839	15,543	15,650	14,095	11,917	8,930	89,697	50,592	27,790
Net interest income	37,621	32,624	27,922	24,131	24,175	23,482	22,206	20,108	122,298	89,971	66,597
Provision for loan losses	1,993	1,193	105	649	1,608	617	998	1,406	3,940	4,629	2,472
Net Interest Income After Provision for Loan Losses	35,628	31,431	27,817	23,482	22,567	22,865	21,208	18,702	118,358	85,342	64,125
Noninterest income	22,703	10,852	9,870	3,664	14,735	11,907	11,630	11,313	47,089	49,585	47,680
Noninterest expense	18,836	15,522	15,920	13,035	16,181	12,449	12,000	10,270	63,313	50,900	34,644
Income Before Income Taxes	39,495	26,761	21,767	14,111	21,121	22,323	20,838	19,745	102,134	84,027	77,161
Income taxes	9,434	6,502	5,328	3,541	5,699	5,584	5,186	4,684	24,805	21,153	22,477
Net Income	30,061	20,259	16,439	10,570	15,422	16,739	15,652	15,061	77,329	62,874	54,684
Less: preferred stock dividends	3,618	3,022	1,743	833	832	833	832	833	9,216	3,330	3,330
Net Income Allocated to Common Shareholders	$ 26,443	$ 17,237	$ 14,696	$ 9,737	$ 14,590	$ 15,906	$ 14,820	$ 14,228	$ 68,113	$ 59,544	$ 51,354
Per common share data:
Basic Earnings Per Share (in dollar per share)	$ 0.92	$ 0.60	$ 0.51	$ 0.34	$ 0.51	$ 0.55	$ 0.52	$ 0.50	$ 2.37	$ 2.08	$ 2.28
Diluted Earnings Per Share (in dollar per share)	$ 0.92	$ 0.60	$ 0.51	$ 0.34	$ 0.51	$ 0.55	$ 0.52	$ 0.50	$ 2.37	$ 2.07	$ 2.28