Securities (Securities in a Continuous Unrealized Loss Position) (Details) $ in Thousands	Sep. 30, 2023 USD ($) security	Dec. 31, 2022 USD ($) security
Debt Securities, Available-for-sale [Line Items]
Available for sale debt securities, securities in continuous unrealized loss position, less than 12 months, number of securities | security	32	99
Available for sale debt securities, securities in continuous unrealized loss position, less than 12 months, fair value	$ 91,029	$ 308,892
Available for sale debt securities, securities in continuous unrealized loss position, less than 12 months, unrealized losses	$ (3,642)	$ (25,598)
Available for sale debt securities, securities in continuous unrealized loss position, greater than 12 months, number of securities | security	182	91
Available for sale debt securities, securities in continuous unrealized loss position, greater than 12 months, fair value	$ 866,455	$ 661,065
Available for sale debt securities, securities in continuous unrealized loss position, greater than 12 months, unrealized losses	$ 207,489	$ 147,084
Available for sale debt securities, securities in continuous unrealized loss position, number of securities | security	214	190
Available for sale debt securities, securities in continuous unrealized loss position, fair value	$ 957,484	$ 969,957
Available for sale debt securities, securities in continuous unrealized loss position, unrealized losses	$ 211,131	$ 172,682
Obligations of U.S. government-sponsored enterprises [Member]
Debt Securities, Available-for-sale [Line Items]
Available for sale debt securities, securities in continuous unrealized loss position, less than 12 months, number of securities | security	2	4
Available for sale debt securities, securities in continuous unrealized loss position, less than 12 months, fair value	$ 29,326	$ 20,115
Available for sale debt securities, securities in continuous unrealized loss position, less than 12 months, unrealized losses	$ (674)	$ (638)
Available for sale debt securities, securities in continuous unrealized loss position, greater than 12 months, number of securities | security	21	18
Available for sale debt securities, securities in continuous unrealized loss position, greater than 12 months, fair value	$ 187,236	$ 169,466
Available for sale debt securities, securities in continuous unrealized loss position, greater than 12 months, unrealized losses	$ 33,715	$ 30,984
Available for sale debt securities, securities in continuous unrealized loss position, number of securities | security	23	22
Available for sale debt securities, securities in continuous unrealized loss position, fair value	$ 216,562	$ 189,581
Available for sale debt securities, securities in continuous unrealized loss position, unrealized losses	$ 34,389	$ 31,622
Mortgage-backed securities issued by U.S. government-sponsored agencies and U.S. government-sponsored enterprises [Member]
Debt Securities, Available-for-sale [Line Items]
Available for sale debt securities, securities in continuous unrealized loss position, less than 12 months, number of securities | security	30	95
Available for sale debt securities, securities in continuous unrealized loss position, less than 12 months, fair value	$ 61,703	$ 288,777
Available for sale debt securities, securities in continuous unrealized loss position, less than 12 months, unrealized losses	$ (2,968)	$ (24,960)
Available for sale debt securities, securities in continuous unrealized loss position, greater than 12 months, number of securities | security	154	66
Available for sale debt securities, securities in continuous unrealized loss position, greater than 12 months, fair value	$ 658,490	$ 471,355
Available for sale debt securities, securities in continuous unrealized loss position, greater than 12 months, unrealized losses	$ 171,927	$ 113,788
Available for sale debt securities, securities in continuous unrealized loss position, number of securities | security	184	161
Available for sale debt securities, securities in continuous unrealized loss position, fair value	$ 720,193	$ 760,132
Available for sale debt securities, securities in continuous unrealized loss position, unrealized losses	$ 174,895	$ 138,748
Individual name issuer trust preferred debt securities
Debt Securities, Available-for-sale [Line Items]
Available for sale debt securities, securities in continuous unrealized loss position, less than 12 months, number of securities | security	0	0
Available for sale debt securities, securities in continuous unrealized loss position, less than 12 months, fair value	$ 0	$ 0
Available for sale debt securities, securities in continuous unrealized loss position, less than 12 months, unrealized losses	$ 0	$ 0
Available for sale debt securities, securities in continuous unrealized loss position, greater than 12 months, number of securities | security	3	3
Available for sale debt securities, securities in continuous unrealized loss position, greater than 12 months, fair value	$ 8,765	$ 8,760
Available for sale debt securities, securities in continuous unrealized loss position, greater than 12 months, unrealized losses	$ 632	$ 627
Available for sale debt securities, securities in continuous unrealized loss position, number of securities | security	3	3
Available for sale debt securities, securities in continuous unrealized loss position, fair value	$ 8,765	$ 8,760
Available for sale debt securities, securities in continuous unrealized loss position, unrealized losses	$ 632	$ 627
Corporate bonds [Member]
Debt Securities, Available-for-sale [Line Items]
Available for sale debt securities, securities in continuous unrealized loss position, less than 12 months, number of securities | security	0	0
Available for sale debt securities, securities in continuous unrealized loss position, less than 12 months, fair value	$ 0	$ 0
Available for sale debt securities, securities in continuous unrealized loss position, less than 12 months, unrealized losses	$ 0	$ 0
Available for sale debt securities, securities in continuous unrealized loss position, greater than 12 months, number of securities | security	4	4
Available for sale debt securities, securities in continuous unrealized loss position, greater than 12 months, fair value	$ 11,964	$ 11,484
Available for sale debt securities, securities in continuous unrealized loss position, greater than 12 months, unrealized losses	$ 1,215	$ 1,685
Available for sale debt securities, securities in continuous unrealized loss position, number of securities | security	4	4
Available for sale debt securities, securities in continuous unrealized loss position, fair value	$ 11,964	$ 11,484
Available for sale debt securities, securities in continuous unrealized loss position, unrealized losses	$ 1,215	$ 1,685