CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Interest and dividend income:
Loans/leases, including fees	$ 190,324	$ 160,160	$ 117,465
Securities:
Taxable	6,607	6,353	5,145
Nontaxable	13,858	13,668	11,253
Interest-bearing deposits at financial institutions	3,910	1,267	874
Restricted investment securities	1,174	1,093	631
Federal funds sold	203	338	149
Total interest and dividend income	216,076	182,879	135,517
Interest expense:
Deposits	50,875	30,675	13,012
Short-term borrowings	363	271	114
Federal Home Loan Bank advances	2,894	4,193	1,981
Other borrowings	513	3,207	2,879
Subordinated notes	3,564	139
Junior subordinated debentures	2,308	1,999	1,466
Total interest expense	60,517	40,484	19,452
Net interest income	155,559	142,395	116,065
Provision for loan/lease losses	7,066	12,658	8,470
Net interest income after provision for loan/lease losses	148,493	129,737	107,595
Noninterest income:
Revenue	294,844	224,420	165,999
Gains on sales of residential real estate loans, net	2,571	901	409
Gains on sales of government guaranteed portions of loans, net	748	405	1,164
Swap fee income	28,295	10,787	3,095
Securities losses, net	(30)		(88)
Earnings on bank-owned life insurance	1,973	1,632	1,802
Gain on sale of assets and liabilities of subsidiary	12,286
Other	5,429	3,848	3,265
Total noninterest income	78,768	41,541	30,482
Noninterest expense:
Salaries and employee benefits	92,063	68,994	55,722
Occupancy and equipment expense	15,106	12,884	10,938
Professional and data processing fees	13,381	11,452	10,757
Acquisition costs		1,795	1,069
Post-acquisition compensation, transition and integration costs	3,582	2,086	4,310
Disposition costs	3,325
FDIC insurance, other insurance and regulatory fees	2,955	3,594	2,752
Loan/lease expense	1,097	1,544	1,164
Net cost of and gains/losses on operations of other real estate	3,789	2,489	2
Advertising and marketing	4,548	3,552	2,625
Bank service charges	2,009	1,838	1,771
Loss on debt extinguishment, net	436
Correspondent banking expense	836	821	807
Amortization of intangibles	2,266	1,692	1,001
Goodwill impairment	3,000
Other	6,841	6,402	4,506
Total noninterest expense	155,234	119,143	97,424
Net income before income taxes	72,027	52,135	40,653
Federal and state income tax expense (benefit)	14,619	9,015	4,946
Net income	$ 57,408	$ 43,120	$ 35,707
Basic earnings per common share (in dollars per share)	$ 3.65	$ 2.92	$ 2.68
Diluted earnings per common share (in dollars per share)	$ 3.60	$ 2.86	$ 2.61
Weighted average common shares outstanding (in shares)	15,730,016	14,768,687	13,325,128
Weighted average common and common equivalent shares outstanding (in shares)	15,967,775	15,064,730	13,680,472
Cash dividends declared per common share (in dollars per share)	$ 0.24	$ 0.24	$ 0.20
Trust department fees
Noninterest income:
Revenue	$ 9,559	$ 8,707	$ 7,188
Investment advisory and management fees
Noninterest income:
Revenue	6,995	4,726	3,870
Deposit service fees
Noninterest income:
Revenue	6,812	6,420	5,919
Debit card fees
Noninterest income:
Revenue	3,357	3,263	2,942
Correspondent banking fees
Noninterest income:
Revenue	$ 773	$ 852	$ 916