Fair Value Accounting and Measurement (Carrying Amounts and Estimated Fair Values of Selected Financial Instruments) (Details) - USD ($) $ in Thousands		Dec. 31, 2022	Dec. 31, 2021
Assets
Interest-earning deposits with banks		$ 29,283	$ 671,300
Debt Securities, Available-for-sale		4,589,099	5,910,999
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss		2,034,792	2,148,327
Debt Securities, Held-to-maturity, Fair Value		1,722,778	2,122,606
Loans held for sale - Fair value option	[1]	907	9,570
Estimate of Fair Value Measurement
Assets
Cash and due from banks		262,458	153,414
Interest-earning deposits with banks		29,283	671,300
Debt Securities, Available-for-sale		4,589,099	5,910,999
Debt Securities, Held-to-maturity, Fair Value		1,722,778	2,122,606
FHLB stock		48,160	10,280
Loans held for sale - Fair value option		76,843	9,774
Loans		11,072,802	10,679,349
Liabilities
Time Deposits		351,084	430,682
FHLB Advances and FRB Borrowings		954,147	8,752
Repurchase agreements		95,168	86,013
Subordinated Debentures		10,013	10,125
Junior Subordinated Notes		9,919	9,927
Carrying Amount
Assets
Cash and due from banks		262,458	153,414
Interest-earning deposits with banks		29,283	671,300
Debt Securities, Available-for-sale		4,589,099	5,910,999
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss		2,034,792	2,148,327
FHLB stock		48,160	10,280
Loans held for sale - Fair value option		76,843	9,774
Loans		11,452,535	10,486,359
Liabilities
Time Deposits		362,087	445,957
FHLB Advances and FRB Borrowings		954,315	7,359
Repurchase agreements		95,168	86,013
Subordinated Debentures		10,000	10,000
Junior Subordinated Notes		10,310	10,310
Fair Value, Inputs, Level 1 | Estimate of Fair Value Measurement
Assets
Cash and due from banks		262,458	153,414
Interest-earning deposits with banks		29,283	671,300
Debt Securities, Available-for-sale		167,896	157,536
Debt Securities, Held-to-maturity, Fair Value		0	0
FHLB stock		0	0
Loans held for sale - Fair value option		0	0
Loans		0	0
Liabilities
Time Deposits		0	0
FHLB Advances and FRB Borrowings		0	0
Repurchase agreements		0	0
Subordinated Debentures		0	0
Junior Subordinated Notes		0	0
Fair Value, Inputs, Level 2 | Estimate of Fair Value Measurement
Assets
Cash and due from banks		0	0
Interest-earning deposits with banks		0	0
Debt Securities, Available-for-sale		4,421,203	5,753,463
Debt Securities, Held-to-maturity, Fair Value		1,722,778	2,122,606
FHLB stock		48,160	10,280
Loans held for sale - Fair value option		76,843	9,774
Loans		0	0
Liabilities
Time Deposits		351,084	430,682
FHLB Advances and FRB Borrowings		954,147	8,752
Repurchase agreements		95,168	86,013
Subordinated Debentures		10,013	10,125
Junior Subordinated Notes		9,919	9,927
Fair Value, Inputs, Level 3 | Estimate of Fair Value Measurement
Assets
Cash and due from banks		0	0
Interest-earning deposits with banks		0	0
Debt Securities, Available-for-sale		0	0
Debt Securities, Held-to-maturity, Fair Value		0	0
FHLB stock		0	0
Loans held for sale - Fair value option		0	0
Loans		11,072,802	10,679,349
Liabilities
Time Deposits		0	0
FHLB Advances and FRB Borrowings		0	0
Repurchase agreements		0	0
Subordinated Debentures		0	0
Junior Subordinated Notes		0	0
Interest Rate Swap | Estimate of Fair Value Measurement
Assets
Interest rate derivative assets, at fair value		40,289	24,257
Liabilities
Interest rate derivative liabilities, at fair value		40,289	24,257
Interest Rate Swap | Carrying Amount
Assets
Interest rate derivative assets, at fair value		40,289	24,257
Liabilities
Interest rate derivative liabilities, at fair value		40,289	24,257
Interest Rate Swap | Fair Value, Inputs, Level 1 | Estimate of Fair Value Measurement
Assets
Interest rate derivative assets, at fair value		0	0
Liabilities
Interest rate derivative liabilities, at fair value		0	0
Interest Rate Swap | Fair Value, Inputs, Level 2 | Estimate of Fair Value Measurement
Assets
Interest rate derivative assets, at fair value		40,289	24,257
Liabilities
Interest rate derivative liabilities, at fair value		40,289	24,257
Interest Rate Swap | Fair Value, Inputs, Level 3 | Estimate of Fair Value Measurement
Assets
Interest rate derivative assets, at fair value		0	0
Liabilities
Interest rate derivative liabilities, at fair value		$ 0	0
Interest Rate Lock Commitments | Estimate of Fair Value Measurement
Assets
Interest rate derivative assets, at fair value			356
Interest Rate Lock Commitments | Carrying Amount
Assets
Interest rate derivative assets, at fair value			356
Interest Rate Lock Commitments | Fair Value, Inputs, Level 1 | Estimate of Fair Value Measurement
Assets
Interest rate derivative assets, at fair value			0
Interest Rate Lock Commitments | Fair Value, Inputs, Level 2 | Estimate of Fair Value Measurement
Assets
Interest rate derivative assets, at fair value			0
Interest Rate Lock Commitments | Fair Value, Inputs, Level 3 | Estimate of Fair Value Measurement
Assets
Interest rate derivative assets, at fair value			356
Forward sales contracts | Estimate of Fair Value Measurement
Liabilities
Interest rate derivative liabilities, at fair value			27
Forward sales contracts | Carrying Amount
Liabilities
Interest rate derivative liabilities, at fair value			27
Forward sales contracts | Fair Value, Inputs, Level 1 | Estimate of Fair Value Measurement
Liabilities
Interest rate derivative liabilities, at fair value			0
Forward sales contracts | Fair Value, Inputs, Level 2 | Estimate of Fair Value Measurement
Liabilities
Interest rate derivative liabilities, at fair value			27
Forward sales contracts | Fair Value, Inputs, Level 3 | Estimate of Fair Value Measurement
Liabilities
Interest rate derivative liabilities, at fair value			$ 0

[1] Amounts represent loans for which the Company has elected the fair value option. The remaining loans held for sale at December 31, 2022 relate to our pending divestitures and are held at the lower of cost or market value.