Fair value disclosure only table (Details) - USD ($) $ in Thousands		Dec. 31, 2024	Dec. 31, 2023
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Held-to-maturity		$ 1,434,956	$ 1,569,107
Securities held to maturity, fair value		1,291,801	1,417,608
Federal Home Loan Bank Stock		31,573	43,557
Bank Owned Life Insurance		303,965	297,387
Liabilities, Fair Value Disclosure [Abstract]
Federal Home Loan Bank borrowings		638,514	1,105,541
Subordinated Debt		0	49,980
Reported Value Measurement
Assets, Fair Value Disclosure [Abstract]
Loans, net of allowance for loan losses		14,294,628	14,106,967
Estimate of Fair Value Measurement
Assets, Fair Value Disclosure [Abstract]
Loans, net of allowance for loan losses	[1]	13,213,596	13,079,368
Deposits [Member]
Liabilities, Fair Value Disclosure [Abstract]
Financial Liabilities Book Value		12,558,632	12,684,068
Accrued Liabilities, Fair Value Disclosure	[2]	12,558,632	12,684,068
Bank Time Deposits [Member]
Liabilities, Fair Value Disclosure [Abstract]
Financial Liabilities Book Value		2,747,346	2,181,479
Accrued Liabilities, Fair Value Disclosure	[3]	2,739,606	2,166,573
Federal Home Loan Bank Advances [Member]
Liabilities, Fair Value Disclosure [Abstract]
Federal Home Loan Bank borrowings		638,514	1,105,541
Federal Home Loan Bank Borrowings, Fair Value Disclosure	[3]	638,489	1,103,845
Junior Subordinated Debt [Member]
Liabilities, Fair Value Disclosure [Abstract]
Junior subordinated debentures (less unamortized debt issuance costs of $28 and $30)		62,860	62,858
Accrued Liabilities, Fair Value Disclosure	[4]	61,661	58,911
Subordinated Debt [Member]
Liabilities, Fair Value Disclosure [Abstract]
Subordinated Debt			49,980
Accrued Liabilities, Fair Value Disclosure	[3]		49,613
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Estimate of Fair Value Measurement
Assets, Fair Value Disclosure [Abstract]
Loans, net of allowance for loan losses		0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Deposits [Member]
Liabilities, Fair Value Disclosure [Abstract]
Accrued Liabilities, Fair Value Disclosure		0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Bank Time Deposits [Member]
Liabilities, Fair Value Disclosure [Abstract]
Accrued Liabilities, Fair Value Disclosure		0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Federal Home Loan Bank Advances [Member]
Liabilities, Fair Value Disclosure [Abstract]
Federal Home Loan Bank Borrowings, Fair Value Disclosure		0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Junior Subordinated Debt [Member]
Liabilities, Fair Value Disclosure [Abstract]
Accrued Liabilities, Fair Value Disclosure		0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Subordinated Debt [Member]
Liabilities, Fair Value Disclosure [Abstract]
Accrued Liabilities, Fair Value Disclosure			0
Significant Other Observable Inputs (Level 2) [Member] | Deposits [Member]
Liabilities, Fair Value Disclosure [Abstract]
Accrued Liabilities, Fair Value Disclosure		12,558,632	12,684,068
Significant Other Observable Inputs (Level 2) [Member] | Bank Time Deposits [Member]
Liabilities, Fair Value Disclosure [Abstract]
Accrued Liabilities, Fair Value Disclosure		2,739,606	2,166,573
Significant Other Observable Inputs (Level 2) [Member] | Federal Home Loan Bank Advances [Member]
Liabilities, Fair Value Disclosure [Abstract]
Federal Home Loan Bank Borrowings, Fair Value Disclosure		638,489	1,103,845
Significant Other Observable Inputs (Level 2) [Member] | Junior Subordinated Debt [Member]
Liabilities, Fair Value Disclosure [Abstract]
Accrued Liabilities, Fair Value Disclosure		61,661	58,911
Significant Unobservable Inputs (Level 3) [Member] | Estimate of Fair Value Measurement
Assets, Fair Value Disclosure [Abstract]
Loans, net of allowance for loan losses		13,213,596	13,079,368
Significant Unobservable Inputs (Level 3) [Member] | Deposits [Member]
Liabilities, Fair Value Disclosure [Abstract]
Accrued Liabilities, Fair Value Disclosure		0	0
Significant Unobservable Inputs (Level 3) [Member] | Bank Time Deposits [Member]
Liabilities, Fair Value Disclosure [Abstract]
Accrued Liabilities, Fair Value Disclosure		0	0
Significant Unobservable Inputs (Level 3) [Member] | Federal Home Loan Bank Advances [Member]
Liabilities, Fair Value Disclosure [Abstract]
Federal Home Loan Bank Borrowings, Fair Value Disclosure		0	0
Significant Unobservable Inputs (Level 3) [Member] | Junior Subordinated Debt [Member]
Liabilities, Fair Value Disclosure [Abstract]
Accrued Liabilities, Fair Value Disclosure		0	0
Significant Unobservable Inputs (Level 3) [Member] | Subordinated Debt [Member]
Liabilities, Fair Value Disclosure [Abstract]
Accrued Liabilities, Fair Value Disclosure			49,613
US Government Agencies Debt Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Securities held to maturity, fair value	[5]		28,408
Liabilities, Fair Value Disclosure [Abstract]
Debt Securities, Held-to-maturity			29,521
US Government Agencies Debt Securities [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Assets, Fair Value Disclosure [Abstract]
Securities held to maturity, fair value			0
US Government Agencies Debt Securities [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets, Fair Value Disclosure [Abstract]
Securities held to maturity, fair value			28,408
US Government Agencies Debt Securities [Member] | Significant Unobservable Inputs (Level 3) [Member]
Assets, Fair Value Disclosure [Abstract]
Securities held to maturity, fair value			0
US Treasury Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Securities held to maturity, fair value	[5]	93,022	91,535
Liabilities, Fair Value Disclosure [Abstract]
Debt Securities, Held-to-maturity		100,791	100,712
US Treasury Securities [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Assets, Fair Value Disclosure [Abstract]
Securities held to maturity, fair value		0	0
US Treasury Securities [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets, Fair Value Disclosure [Abstract]
Securities held to maturity, fair value		93,022	91,535
US Treasury Securities [Member] | Significant Unobservable Inputs (Level 3) [Member]
Assets, Fair Value Disclosure [Abstract]
Securities held to maturity, fair value		0	0
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Assets, Fair Value Disclosure [Abstract]
Securities held to maturity, fair value	[5]	726,362	763,728
Liabilities, Fair Value Disclosure [Abstract]
Debt Securities, Held-to-maturity		788,470	829,431
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Assets, Fair Value Disclosure [Abstract]
Securities held to maturity, fair value		0	0
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets, Fair Value Disclosure [Abstract]
Securities held to maturity, fair value		726,362	763,728
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] | Significant Unobservable Inputs (Level 3) [Member]
Assets, Fair Value Disclosure [Abstract]
Securities held to maturity, fair value		0	0
Collateralized Mortgage Obligations [Member]
Assets, Fair Value Disclosure [Abstract]
Securities held to maturity, fair value	[5]	357,684	407,911
Liabilities, Fair Value Disclosure [Abstract]
Debt Securities, Held-to-maturity		422,827	477,517
Collateralized Mortgage Obligations [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Assets, Fair Value Disclosure [Abstract]
Securities held to maturity, fair value		0	0
Collateralized Mortgage Obligations [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets, Fair Value Disclosure [Abstract]
Securities held to maturity, fair value		357,684	407,911
Collateralized Mortgage Obligations [Member] | Significant Unobservable Inputs (Level 3) [Member]
Assets, Fair Value Disclosure [Abstract]
Securities held to maturity, fair value		0	0
Single Issuer Trust Preferred Securities Issued By Banks [Member]
Assets, Fair Value Disclosure [Abstract]
Securities held to maturity, fair value	[5]		1,373
Liabilities, Fair Value Disclosure [Abstract]
Debt Securities, Held-to-maturity			1,500
Single Issuer Trust Preferred Securities Issued By Banks [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Assets, Fair Value Disclosure [Abstract]
Securities held to maturity, fair value			0
Single Issuer Trust Preferred Securities Issued By Banks [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets, Fair Value Disclosure [Abstract]
Securities held to maturity, fair value			1,373
Single Issuer Trust Preferred Securities Issued By Banks [Member] | Significant Unobservable Inputs (Level 3) [Member]
Assets, Fair Value Disclosure [Abstract]
Securities held to maturity, fair value			0
Small Business Administration Pooled Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Securities held to maturity, fair value	[5]	114,733	124,653
Liabilities, Fair Value Disclosure [Abstract]
Debt Securities, Held-to-maturity		122,868	130,426
Small Business Administration Pooled Securities [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Assets, Fair Value Disclosure [Abstract]
Securities held to maturity, fair value		0	0
Small Business Administration Pooled Securities [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets, Fair Value Disclosure [Abstract]
Securities held to maturity, fair value		114,733	124,653
Small Business Administration Pooled Securities [Member] | Significant Unobservable Inputs (Level 3) [Member]
Assets, Fair Value Disclosure [Abstract]
Securities held to maturity, fair value		0	0
Investment in Federal Home Loan Bank Stock [Member]
Assets, Fair Value Disclosure [Abstract]
Federal Home Loan Bank Stock		31,573	43,557
Investment in Federal Home Loan Bank Stock, Fair Value Disclosure	[6]	31,573	43,557
Investment in Federal Home Loan Bank Stock [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Assets, Fair Value Disclosure [Abstract]
Investment in Federal Home Loan Bank Stock, Fair Value Disclosure		0	0
Investment in Federal Home Loan Bank Stock [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets, Fair Value Disclosure [Abstract]
Investment in Federal Home Loan Bank Stock, Fair Value Disclosure		31,573	43,557
Investment in Federal Home Loan Bank Stock [Member] | Significant Unobservable Inputs (Level 3) [Member]
Assets, Fair Value Disclosure [Abstract]
Investment in Federal Home Loan Bank Stock, Fair Value Disclosure		0	0
Cash Surrender Value [Member]
Assets, Fair Value Disclosure [Abstract]
Bank Owned Life Insurance		303,965	297,387
Cash Surrender Value, Fair Value Disclosure	[7]	303,965	297,387
Cash Surrender Value [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Assets, Fair Value Disclosure [Abstract]
Cash Surrender Value, Fair Value Disclosure		0	0
Cash Surrender Value [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets, Fair Value Disclosure [Abstract]
Cash Surrender Value, Fair Value Disclosure		303,965	297,387
Cash Surrender Value [Member] | Significant Unobservable Inputs (Level 3) [Member]
Assets, Fair Value Disclosure [Abstract]
Cash Surrender Value, Fair Value Disclosure		$ 0	$ 0

[1] Fair value of loans is measured using the exit price valuation method, determined primarily by discounting the future cash flows using the current rates at which similar loans would be made to borrowers with similar credit ratings and for the same remaining maturities or cash flows, while incorporating liquidity and credit assumptions. Additionally, this amount excludes individually assessed collateral dependent loans, which are deemed to be marked to fair value on a nonrecurring basis.

[2] Fair value of demand deposits, savings and interest checking accounts and money market deposits is the amount payable on demand at the reporting date.

[3] Fair value was determined by discounting anticipated future cash payments using rates currently available for instruments with similar remaining maturities.

[4] Fair value was determined based upon market prices of securities with similar terms and maturities.

[5] The fair values presented are based on quoted market prices, where available. If quoted market prices are not available, fair values are based on quoted market prices of comparable instruments and/or discounted cash flow analysis.

[6] Federal Home Loan Bank stock has no quoted market value and is carried at cost, therefore the carrying amount approximates fair value.

[7] Cash surrender value of life insurance is recorded at its cash surrender value (or the amount that can be realized upon surrender of the policy), therefore, carrying amount approximates fair value.