Securities (Details Textual) (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021	Jun. 30, 2021
Debt Securities, Available-for-sale [Line Items]
Interest Receivable	$ (39,000)		$ (29,900)
Trading	3,637	$ 3,720
Debt Securities, Available-for-sale	1,501,949	1,571,148
Debt Securities, Available-for-sale, Past due	0	0
Investments in obligations of individual states, counties or municipalities which exceed 10% of equity	0	0
Debt Securities, Available-for-sale, Past due	0	0
Debt Securities, Available-for-sale, Nonaccrual	0	0
Debt Securities, Held-to-maturity, Nonaccrual	0	0
Securities (Textual) [Abstract]
Callable Securities in Investment Portfolio	25,800
Pledged Financial Instruments, Not Separately Reported, Securities	876,400	740,600
Investments in obligations of individual states, counties or municipalities which exceed 10% of equity	0	0
Debt Securities, Held-to-maturity	1,408,189	1,066,818
Equity Securities, FV-NI	21,181	23,173
Debt Securities, Held-to-maturity, 90 Days or More Past Due, Still Accruing	0	0
Available-for-sale Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Interest Receivable	(3,000)	(3,000)
Held-to-maturity Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Interest Receivable	$ (2,900)	$ (2,000)