Condensed Consolidated Statements of Income - USD ($) shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Interest Income
Loans	$ 136,104,000	$ 140,819,000	$ 269,878,000	$ 288,605,000
Investment securities	16,217,000	20,386,000	31,924,000	40,624,000
Other short-term investments	1,679,000	839,000	3,348,000	3,042,000
Total interest income	154,000,000	162,044,000	305,150,000	332,271,000
Interest Expense
Deposits	3,131,000	10,077,000	6,588,000	27,194,000
Borrowed funds	3,112,000	3,156,000	6,219,000	8,997,000
Senior and subordinated debt	3,469,000	3,577,000	6,940,000	7,271,000
Total interest expense	9,712,000	16,810,000	19,747,000	43,462,000
Net interest income	144,288,000	145,234,000	285,403,000	288,809,000
Provision for loan losses	0	32,649,000	6,098,000	72,181,000
Net interest income after provision for loan losses	144,288,000	112,585,000	279,305,000	216,628,000
Noninterest Income
Wealth management fees	14,555,000	11,942,000	28,704,000	24,303,000
Service charges on deposit accounts	10,778,000	9,125,000	20,758,000	20,906,000
Mortgage banking income	6,749,000	3,477,000	16,936,000	5,265,000
Card-based fees	4,764,000	3,180,000	9,320,000	7,148,000
Capital market products income	1,954,000	694,000	4,043,000	5,416,000
Other service charges, commissions, and fees	2,823,000	2,078,000	5,584,000	4,760,000
Net securities losses	0	0	0	(1,005,000)
Other income	4,647,000	2,495,000	6,728,000	5,560,000
Total noninterest income	46,270,000	32,991,000	92,073,000	72,353,000
Noninterest Expense
Salaries and employee benefits	64,211,000	63,672,000	130,612,000	126,531,000
Net occupancy and equipment expense	13,654,000	15,116,000	28,406,000	29,343,000
Technology and related costs	10,453,000	9,853,000	20,737,000	18,401,000
Professional services	7,568,000	8,880,000	15,627,000	19,270,000
Net OREO expense	160,000	126,000	749,000	546,000
Other expenses	17,569,000	17,434,000	34,139,000	32,849,000
Acquisition and integration related expenses	7,773,000	5,249,000	8,018,000	10,721,000
Optimization costs	31,000	0	1,556,000	0
Total noninterest expense	121,419,000	120,330,000	239,844,000	237,661,000
Income before income tax expense	69,139,000	25,246,000	131,534,000	51,320,000
Income tax expense	18,018,000	6,182,000	35,390,000	12,650,000
Net income	51,121,000	19,064,000	96,144,000	38,670,000
Preferred dividends	(4,034,000)	(1,037,000)	(8,068,000)	(1,037,000)
Net income applicable to unvested restricted shares	(521,000)	(187,000)	(1,007,000)	(379,000)
Net income applicable to common shareholders	$ 46,566,000	$ 17,840,000	$ 87,069,000	$ 37,254,000
Per Common Share Data
Basic earnings per common share (in dollars per share)	$ 0.41	$ 0.16	$ 0.77	$ 0.33
Diluted earnings per common share (in dollars per share)	0.41	0.16	0.77	0.33
Dividends declared per common share (in dollars per share)	$ 0.14	$ 0.14	$ 0.28	$ 0.28
Weighted-average common shares outstanding (in Shares)	112,865	113,145	112,980	111,533
Weighted-average diluted common shares outstanding (in Shares)	113,640	113,336	113,737	111,872