Condensed Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Interest income:
Interest and fees on loans	$ 67,169	$ 61,025
Interest on debt securities:
Taxable	7,557	5,475
Nontaxable	1,489	447
Interest on interest-earning deposits	300	447
Dividends on equity securities	173	223
Total interest income	76,688	67,617
Interest expense:
Interest Expense, Deposits	9,888	11,820
Subordinated debentures and notes	1,919	1,648
FHLB advances	895	1,398
Notes payable and other borrowings	618	408
Total interest expense	13,320	15,274
Net interest income	63,368	52,343
Provision for credit losses	22,264	1,476
Net interest income after provision for credit losses	41,104	50,867
Noninterest income:
Total noninterest income	13,408	9,230
Noninterest expense:
Employee compensation and benefits	21,685	19,352
Occupancy	3,347	2,637
Data processing	2,082	1,906
Professional fees	862	746
Merger-related expenses	0	7,270
Other	10,697	7,927
Total noninterest expense	38,673	39,838
Income before income tax expense	15,839	20,259
Income tax expense	2,971	4,103
Net income	$ 12,868	$ 16,156
Earnings per common share
Basic (usd per share)	$ 0.49	$ 0.68
Diluted (usd per share)	$ 0.48	$ 0.67
Deposit Account [Member]
Noninterest income:
Total noninterest income	$ 3,143	$ 2,935
Fiduciary and Trust [Member]
Noninterest income:
Total noninterest income	2,501	1,992
Card Services Revenue [Member]
Noninterest income:
Total noninterest income	2,247	1,790
Tax credit activity, net [Member]
Noninterest income:
Total noninterest income	2,036	158
Financial Service, Other [Member]
Noninterest income:
Total noninterest income	$ 3,481	$ 2,355