Consolidated Statements of Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Interest Income
Interest and fees on loans	$ 368,854	$ 400,923	$ 368,606
Interest and dividends on investment securities	18,440	21,037	17,907
Interest on balances with other banks and short-term investments	2,601	7,438	6,616
Interest on federal funds sold	91	232	157
Total interest income	389,986	429,630	393,286
Interest Expense
Interest on deposits	53,566	91,026	60,210
Interest on customer repurchase agreements	293	345	225
Interest on short-term borrowings	1,869	2,298	3,942
Interest on long-term borrowings	12,696	11,916	11,916
Total interest expense	68,424	105,585	76,293
Net Interest Income	321,562	324,045	316,993
Provision for Credit Losses	45,571	13,091	8,660
Provision for Unfunded Commitments	1,380	0	0
Net Interest Income After Provision For Credit Losses	274,611	310,954	308,333
Noninterest Income
Service charges on deposits	4,416	6,247	7,014
Gain on sale of loans	22,089	8,474	5,963
Gain on sale of investment securities	1,815	1,517	97
Increase in the cash surrender value of bank owned life insurance	2,071	1,703	1,507
Other income	15,305	7,758	8,005
Total noninterest income	45,696	25,699	22,586
Noninterest Expense
Salaries and employee benefits	74,440	79,842	67,734
Premises and equipment expenses	15,715	14,387	15,660
Marketing and advertising	4,278	4,826	4,566
Data processing	10,702	9,412	9,714
Legal, accounting and professional fees	16,406	12,195	9,742
FDIC insurance	7,941	3,206	3,512
Other expenses	14,680	15,994	15,783
Total noninterest expense	144,162	139,862	126,711
Income Before Income Tax Expense	176,145	196,791	204,208
Income Tax Expense	43,928	53,848	51,932
Net Income	$ 132,217	$ 142,943	$ 152,276
Earnings Per Common Share
Basic (in dollars per share)	$ 4.09	$ 4.18	$ 4.44
Diluted (in dollars per share)	$ 4.09	$ 4.18	$ 4.42