Consolidated Balance Sheets (Unaudited) - USD ($)		Mar. 31, 2022		Dec. 31, 2021
Assets
Cash and due from banks		$ 173,779,000		$ 141,581,000
Interest-earning deposits with banks		1,666,580,000		2,099,103,000
Securities
Trading		3,956,000		3,720,000
Equity Securities, FV-NI		22,611,000		23,173,000
Debt Securities, Available-for-sale		1,552,731,000		1,571,148,000
Held to maturity (fair value $1,210,938 and $1,064,133)		1,282,441,000		1,066,818,000
Total securities		2,861,739,000		2,664,859,000
Loans Receivable Held-for-sale, Net, Not Part of Disposal Group		6,144,000		24,679,000
Loans
Total loans		13,580,027,000	[1]	13,587,286,000
Less: allowance for credit losses		(144,518,000)		(146,922,000)
Net loans		13,435,509,000		13,440,364,000
Federal Home Loan Bank stock		11,407,000		11,407,000
Bank premises and equipment, net		199,106,000		195,590,000
Goodwill		985,072,000		985,072,000
Other intangible assets		30,759,000		32,772,000
Cash surrender value of life insurance policies		291,192,000		289,304,000
Other assets		497,891,000		538,674,000
Total assets		20,159,178,000		20,423,405,000
Deposits
Noninterest-bearing demand deposits		5,537,156,000		5,479,503,000
Savings and interest checking accounts		6,247,806,000		6,350,016,000
Money market		3,579,820,000		3,556,375,000
Interest-bearing Domestic Deposit, Time Deposits		1,398,610,000		1,531,150,000
Total deposits		16,763,392,000		16,917,044,000
Borrowings
Federal Home Loan Bank borrowings		25,660,000		25,667,000
Long-term Debt		0		14,063,000
Junior Subordinated Notes		62,854,000		62,853,000
Subordinated Debt		49,814,000		49,791,000
Total borrowings		138,328,000		152,374,000
Other liabilities		292,019,000		335,538,000
Total liabilities		17,193,739,000		17,404,956,000
Commitments and contingencies		0		0
Stockholders' equity
Preferred stock, $0.01 par value, authorized: 1,000,000 shares, outstanding: none		0		0
Common stock, $0.01 par value, authorized: 75,000,000 shares, issued and outstanding: 47,377,125 shares at March 31, 2022 and 47,349,778 shares at December 31, 2021 (includes 144,733 and 135,273 shares of unvested participating restricted stock awards, respectively)		472,000		472,000
Value of shares held in rabbi trust at cost: 82,223 shares at March 31, 2022 and 82,565 shares at December 31, 2021		(3,179,000)		(3,146,000)
Deferred compensation and other retirement benefit obligations		3,179,000		3,146,000
Additional paid in capital		2,247,518,000		2,249,078,000
Retained earnings		795,651,000		766,716,000
Accumulated other comprehensive income (loss), net of tax		(78,202,000)		2,183,000
Total stockholders’ equity		2,965,439,000		3,018,449,000
Total liabilities and stockholders' equity		20,159,178,000		20,423,405,000
Debt Securities, Available-for-sale, Amortized Cost		1,646,938,000		1,583,736,000
Debt Securities, Held-to-maturity, Fair Value		$ 1,210,938,000		$ 1,064,133,000
Preferred Stock, Shares Authorized		$ 0.01		$ 0.01
Preferred Stock, Shares Authorized		1,000,000		1,000,000
Preferred Stock, Shares Outstanding		0		0
Common Stock, Par or Stated Value Per Share		$ 0.01		$ 0.01
Common Stock, Shares Authorized		75,000,000		75,000,000
Common Stock, Shares, Issued		47,377,125		47,349,778
Common Stock, Shares, Outstanding		47,377,125		47,349,778
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number		144,733		135,273
Shares Held in Rabbi Trust at Cost		82,223		82,565
Common Class A [Member]
Stockholders' equity
Common Stock, Shares, Outstanding		47,377,125		47,349,778
Subordinated Debt [Member]
Stockholders' equity
Unamortized Debt Issuance Expense		$ 186,000		$ 209,000
Junior Subordinated Debt [Member]
Stockholders' equity
Unamortized Debt Issuance Expense		34,000		35,000
Commercial And Industrial [Member]
Loans
Financing Receivable, before Allowance for Credit Loss		1,566,192,000		1,563,279,000
Total loans		1,566,192,000	[1]	1,563,279,000
Commercial Real Estate [Member]
Loans
Financing Receivable, before Allowance for Credit Loss		7,897,616,000		7,992,344,000
Total loans		7,897,616,000	[1]	7,992,344,000
Construction Loans [Member]
Loans
Financing Receivable, before Allowance for Credit Loss		1,153,945,000		1,165,457,000
Total loans		1,153,945,000	[1]	1,165,457,000
Small Business [Member]
Loans
Financing Receivable, before Allowance for Credit Loss		200,405,000		193,189,000
Total loans		200,405,000	[1]	193,189,000
Residential Real Estate [Member]
Loans
Financing Receivable, before Allowance for Credit Loss		1,706,045,000		1,604,686,000
Total loans		1,706,045,000	[1]	1,604,686,000
Home Equity Loan [Member]
Loans
Total loans	[1]	1,025,815,000
Consumer Portfolio Segment [Member]
Loans
Financing Receivable, before Allowance for Credit Loss		30,009,000		28,720,000
Total loans	[2]	30,009,000		28,720,000
Senior Lien [Member] | Home Equity Loan [Member]
Loans
Financing Receivable, before Allowance for Credit Loss		577,881,000		589,550,000
Junior Lien [Member] | Home Equity Loan [Member]
Loans
Financing Receivable, before Allowance for Credit Loss		$ 447,934,000		$ 450,061,000

[1] Loan origination dates in the tables above reflect the original origination date, or the date of a material modification of a previously originated loan.

[2] Other consumer portfolio is inclusive of deposit account overdrafts recorded as loan balances.