Investments - Revenue and General Obligation Bonds (Details) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2022 USD ($) state item	Dec. 31, 2021 USD ($) item state
Debt Securities, Available-for-sale [Line Items]
Investment securities available for sale (before ASU 2016-13)		$ 973,314
Investment securities available for sale	$ 864,178
Number of municipal bond | item	442	403
Various Township Facilities, Charter Township of Washington [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities available for sale (before ASU 2016-13)		$ 4,000
Number of municipal bond | item		3
States and Political Subdivisions [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities available for sale (before ASU 2016-13)		$ 304,268
Investment securities available for sale	$ 254,888
Fair market value (available-for-sale securities and held-to-maturity securities)	$ 299,737
Investment Portfolio, Securities Issued, Municipalities and Agencies, Number | item	368	335
Investment Portfolio, Securities Issued, States, Number | state	34	33
General Obligation Bonds [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities available for sale (before ASU 2016-13)		$ 259,682
Fair market value (available-for-sale securities and held-to-maturity securities)	$ 258,956
General Obligation Bonds [Member] | City of New York [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities available for sale	5,700
Subordinate Debenture [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities available for sale (before ASU 2016-13)		$ 28,500
Investment securities available for sale	$ 46,500
Number of subordinated debentures owned | item	40	23