Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Available-for-Sale, Amortized Cost	$ 1,533,336	$ 1,566,779
Held to Maturity, Fair Value, Total	$ 1,444,084	$ 1,524,710
Preferred Stock, par value	$ 0.01	$ 0.01
Preferred Stock, Shares Authorized	1,000,000	1,000,000
Preferred Stock, shares outstanding	0	0
Common Stock, par value	$ 0.01	$ 0.01
Common Stock, shares authorized	75,000,000	75,000,000
Common Stock, Shares, Outstanding	44,130,901	45,641,238
Common Stock, Shares, Issued	44,130,901	45,641,238
Common Stock, unvested restricted Stock awards	168,934	135,712
Shares Held in Rabbi Trust	80,955	80,965
Junior Subordinated Debt [Member]
Unamortized debt issuance expense	$ 31	$ 33
Subordinated Debt [Member]
Unamortized debt issuance expense	$ 67	$ 115