Condensed Consolidated Statements of Income - USD ($) shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Interest Income
Loans	$ 140,819,000	$ 157,680,000	$ 288,605,000	$ 302,484,000
Investment securities	20,386,000	18,005,000	40,624,000	34,011,000
Other short-term investments	839,000	1,997,000	3,042,000	3,677,000
Total interest income	162,044,000	177,682,000	332,271,000	340,172,000
Interest Expense
Deposits	10,077,000	19,316,000	27,194,000	35,918,000
Borrowed funds	3,156,000	4,459,000	8,997,000	8,010,000
Senior and subordinated debt	3,577,000	3,595,000	7,271,000	6,908,000
Total interest expense	16,810,000	27,370,000	43,462,000	50,836,000
Net interest income	145,234,000	150,312,000	288,809,000	289,336,000
Provision for loan losses	32,649,000	11,491,000	72,181,000	21,935,000
Net interest income after provision for loan losses	112,585,000	138,821,000	216,628,000	267,401,000
Noninterest Income
Wealth management fees	11,942,000	12,190,000	24,303,000	23,790,000
Service charges on deposit accounts	9,125,000	12,196,000	20,906,000	23,736,000
Mortgage banking income	3,477,000	1,901,000	5,265,000	2,905,000
Card-based fees	3,180,000	4,549,000	7,148,000	8,927,000
Other service charges, commissions, and fees	2,078,000	2,783,000	4,760,000	5,394,000
Capital market products income	694,000	2,154,000	5,416,000	3,433,000
Net securities losses	0	0	(1,005,000)	0
Other income	2,495,000	2,753,000	5,560,000	5,247,000
Total noninterest income	32,991,000	38,526,000	72,353,000	73,432,000
Noninterest Expense
Salaries and employee benefits	63,672,000	58,692,000	126,531,000	116,065,000
Net occupancy and equipment expense	15,116,000	12,294,000	29,343,000	26,091,000
Technology and related costs	9,853,000	7,128,000	18,401,000	13,398,000
Professional services	8,880,000	9,624,000	19,270,000	16,711,000
Net OREO expense	126,000	294,000	546,000	975,000
Other expenses	17,434,000	16,154,000	32,849,000	29,107,000
Acquisition and integration related expenses	5,249,000	9,514,000	10,721,000	13,205,000
Delivering Excellence implementation costs	0	442,000	0	700,000
Total noninterest expense	120,330,000	114,142,000	237,661,000	216,252,000
Income before income tax expense	25,246,000	63,205,000	51,320,000	124,581,000
Income tax expense	6,182,000	16,191,000	12,650,000	31,509,000
Net income	19,064,000	47,014,000	38,670,000	93,072,000
Preferred dividends	(1,037,000)	0	(1,037,000)	0
Net income applicable to unvested restricted shares	(187,000)	(389,000)	(379,000)	(792,000)
Net income applicable to common shares	$ 17,840,000	$ 46,625,000	$ 37,254,000	$ 92,280,000
Per Common Share Data
Basic earnings per common share (in dollars per share)	$ 0.16	$ 0.43	$ 0.33	$ 0.86
Diluted earnings per common share (in dollars per share)	0.16	0.43	0.33	0.86
Dividends declared per common share (in dollars per share)	$ 0.14	$ 0.14	$ 0.28	$ 0.26
Weighted-average common shares outstanding (in Shares)	113,145	108,467	111,533	107,126
Weighted-average diluted common shares outstanding (in Shares)	113,336	108,467	111,872	107,126