Derivative Financial Instruments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Junior subordinated debentures	$ 48,329		$ 48,329		$ 50,507
Notional amount, Assets	2,013,549		2,013,549		1,084,955
Short term advances and brokered CD's	826,800		826,800		871,500
Customer [Member]
Derivative instruments	240,000		240,000		110,600
Bank [Member]
Derivative instruments	240,000		240,000		110,600
Customer and Bank [Member]
Derivative instruments	480,000		480,000		221,200
Cash Flow Hedging [Member]
Amount reclassified from accumulated other comprehensive loss to interest expense	7,100	$ 1,000	18,200	$ 6,100
Amount to be reclassified from the accumulated comprehensive income (loss) into earnings			25,000
Not Designated as Hedging Instrument [Member]
Notional amount, Assets	480,900		480,900		221,200
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]
Notional amount, Assets	825,800		825,800		871,500
Designated as Hedging Instrument [Member] | Fair Value Hedging [Member]
Amount of hedged item	946,800		946,800		273,600
Interest Rate Swap [Member]
Notional amount, Assets	946,800		946,800		273,600
Interest Rate Swap [Member] | Not Designated as Hedging Instrument [Member]
Notional amount, Assets	240,974		240,974		110,598
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]
Notional amount, Assets	825,750		825,750		700,750
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] | Fair Value Hedging [Member]
Notional amount, Assets	946,825		946,825		$ 273,607
Portfolio Layer Hedges on Closed Portfolio of Securities Available for Sale [Member] | Designated as Hedging Instrument [Member]
Notional amount, Assets	273,313		273,313
Notional amount	200,000		200,000
Portfolio Layer Hedges on Closed Portfolio of Loans [Member] | Designated as Hedging Instrument [Member]
Notional amount, Assets	2,615,651		2,615,651
Notional amount	$ 500,000		$ 500,000