Condensed Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Interest and fees on loans and leases:
Taxable	$ 46,039	$ 46,933	$ 136,357	$ 139,766
Exempt from federal income taxes	2,271	2,774	7,312	8,216
Total interest and fees on loans and leases	48,310	49,707	143,669	147,982
Interest and dividends on investment securities:
Taxable	1,646	2,581	6,569	7,939
Exempt from federal income taxes	137	315	573	1,147
Interest on deposits with other banks	100	1,178	492	2,016
Interest and dividends on other earning assets	419	519	1,308	1,640
Total interest income	50,612	54,300	152,611	160,724
Interest expense
Interest on deposits	4,028	9,434	15,806	26,748
Interest on short-term borrowings	97	94	325	949
Interest on long-term debt and subordinated notes	2,633	2,127	6,640	6,224
Total interest expense	6,758	11,655	22,771	33,921
Net interest income	43,854	42,645	129,840	126,803
Provision for credit losses	3,935	1,533	49,515	6,286
Net interest income after provision for credit losses	39,919	41,112	80,325	120,517
Disaggregation of Revenue [Line Items]
Insurance commission and fee income	3,776	3,877	12,575	12,962
Bank owned life insurance income	741	743	2,207	2,438
Net gain on sales of investment securities	57	33	817	41
Net gain on mortgage banking activities	5,860	1,629	12,119	2,908
Other income	2,171	544	4,017	1,606
Total noninterest income	21,805	16,599	58,189	49,252
Noninterest expense
Salaries, benefits and commissions	24,059	22,758	69,595	66,356
Net occupancy	2,609	2,475	7,661	7,687
Equipment	972	1,088	2,890	3,143
Data processing	2,862	2,624	8,372	7,765
Professional fees	1,321	1,517	3,902	4,088
Marketing and advertising	463	558	1,400	1,884
Deposit insurance premiums	707	(444)	1,826	438
Intangible expenses	283	378	934	1,221
Other expense	5,251	5,313	16,684	16,028
Total noninterest expense	38,527	36,267	113,264	108,610
Income before income taxes	23,197	21,444	25,250	61,159
Income tax expense	5,078	3,782	4,208	10,950
Net income	$ 18,119	$ 17,662	$ 21,042	$ 50,209
Net income per share:
Basic (in dollars per share)	$ 0.62	$ 0.60	$ 0.72	$ 1.71
Diluted (in dollars per share)	$ 0.62	$ 0.60	$ 0.72	$ 1.71
Trust fee income
Disaggregation of Revenue [Line Items]
Noninterest income	$ 1,915	$ 1,973	$ 5,729	$ 5,914
Service charges on deposit accounts
Disaggregation of Revenue [Line Items]
Noninterest income	1,187	1,513	3,474	4,395
Investment advisory commission and fee income
Disaggregation of Revenue [Line Items]
Noninterest income	4,005	4,032	11,800	11,876
Other service fee income
Disaggregation of Revenue [Line Items]
Noninterest income	$ 2,093	$ 2,255	$ 5,451	$ 7,112