CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Interest and dividend income:
Loans/leases, including fees		$ 173,967	$ 190,324	$ 160,160
Securities:
Taxable		7,787	6,607	6,353
Nontaxable		14,900	13,858	13,668
Interest-bearing deposits at financial institutions		669	3,910	1,267
Restricted investment securities		1,031	1,174	1,093
Federal funds sold		19	203	338
Total interest and dividend income		198,373	216,076	182,879
Interest expense:
Deposits		23,269	50,875	30,675
Short-term borrowings		84	363	271
Federal Home Loan Bank advances		1,087	2,894	4,193
Other borrowings			513	3,207
Subordinated notes		4,697	3,564	139
Junior subordinated debentures		2,286	2,308	1,999
Total interest expense		31,423	60,517	40,484
Net interest income		166,950	155,559	142,395
Provision for loan/lease losses		55,704	7,066	12,658
Net interest income after provision for loan/lease losses		111,246	148,493	129,737
Noninterest income:
Revenue		312,171	294,844	224,420
Gains on sales of residential real estate loans, net		4,680	2,571	901
Gains on sales of government guaranteed portions of loans, net		224	748	405
Swap fee income		74,821	28,295	10,787
Securities gains (losses), net		2,484	(30)
Earnings on bank-owned life insurance		1,904	1,973	1,632
Gain on sale of assets and liabilities of subsidiary		(158)	12,286
Other		4,814	5,429	3,848
Total noninterest income		113,798	78,768	41,541
Noninterest expense:
Salaries and employee benefits		96,268	92,063	68,994
Occupancy and equipment expense		16,504	15,106	12,884
Professional and data processing fees		14,644	13,381	11,452
Acquisition costs				1,795
Post-acquisition compensation, transition and integration costs		214	3,582	2,086
Disposition costs		690	3,325
FDIC insurance, other insurance and regulatory fees		4,164	2,955	3,594
Loan/lease expense		1,435	1,097	1,544
Net cost of (income from) and gains/losses on operations of other real estate		(307)	3,789	2,489
Advertising and marketing		3,260	4,548	3,552
Bank service charges		2,016	2,009	1,838
Losses on liability extinguishment		3,907	436
Correspondent banking expense		838	836	821
Intangibles amortization		2,149	2,266	1,692
Goodwill impairment		500	3,000
Loss (gain) on sale of subsidiary/certain assets and liabilities of subsidiary		158	(12,286)
Other		5,315	6,841	6,402
Total noninterest expense		151,755	155,234	119,143
Net income before income taxes		73,289	72,027	52,135
Federal and state income tax expense		12,707	14,619	9,015
Net income		$ 60,582	$ 57,408	$ 43,120
Basic earnings per common share (in dollars per share)		$ 3.84	$ 3.65	$ 2.92
Diluted earnings per common share (in dollars per share)		$ 3.80	$ 3.60	$ 2.86
Weighted average common shares outstanding (in shares)	[1]	15,771,650	15,730,016	14,768,687
Weighted average common and common equivalent shares outstanding (in shares)	[2]	15,952,637	15,967,775	15,064,730
Cash dividends declared per common share (in dollars per share)		$ 0.24	$ 0.24	$ 0.24
Trust department fees
Noninterest income:
Revenue		$ 9,207	$ 9,559	$ 8,707
Investment advisory and management fees
Noninterest income:
Revenue		5,318	6,995	4,726
Deposit service fees
Noninterest income:
Revenue		6,041	6,812	6,420
Debit card fees
Noninterest income:
Revenue		3,402	3,357	3,263
Correspondent banking fees
Noninterest income:
Revenue		$ 903	$ 773	$ 852

[1] The increase in weighted average common shares outstanding from 2018 to 2019 was primarily due to the common stock

[2] Excludes anti-dilutive shares of 104,636, 80,437 and 91,954 at December 31, 2020, 2019 and 2018, respectively.