Investment Securities (Narrative) (Details)	3 Months Ended
Mar. 31, 2026 USD ($) security numberOfPosition	Mar. 31, 2025 USD ($)	Dec. 31, 2025 USD ($) security numberOfPosition
Schedule of Held-to-maturity Securities [Line Items]
Available for sale debt securities, at fair value	$ 3,240,067,000		$ 3,164,756,000
Held to maturity debt securities	267,653,000		282,127,000
Debt securities, available-for-sale, accrued interest, after allowance for credit loss	11,400,000		$ 10,900,000
Proceeds from sale of debt securities, available for sale, gross	0	$ 1,700,000
Gain recognized on sale of securities		87,000
Loss recognized on sale of securities		0
Proceeds from calls on securities	$ 0	9,600,000
Gain recognized on proceeds from calls on sale of securities		0
Loss recognized on proceeds from calls on sale of securities		0
Securities available for sale, number of securities in an unrealized loss position \| numberOfPosition	471		406
Accrued interest on held to maturity	$ 2,500,000		$ 2,600,000
Proceeds from sale of held-to-maturity securities	0	0
Held to maturity securities, proceeds from calls	2,800,000	5,000,000
Held to maturity securities, recognized gain on calls	0	0
Held to maturity securities, recognized loss on calls	$ 0	$ 0
Number of securities in an unrealized loss position \| security	216		221
AAA
Schedule of Held-to-maturity Securities [Line Items]
Amount of total portfolio	17.00%
AA
Schedule of Held-to-maturity Securities [Line Items]
Amount of total portfolio	72.00%
A
Schedule of Held-to-maturity Securities [Line Items]
Amount of total portfolio	7.00%
A rated or not rated
Schedule of Held-to-maturity Securities [Line Items]
Amount of total portfolio	4.00%

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