Fair Value Measurements, Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Financial assets
Cash and due from banks	$ 311,269	$ 436,952
Interest-bearing deposits in other financial institutions	511,116	156,693
Federal funds sold and securities purchased under agreements to resell	455	27,810
Available-for-sale Securities	3,381,607	2,742,025
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	3,967,083	3,960,451
Investment securities held to maturity, fair value	3,481,502	3,401,018
Equity securities with readily determinable fair values, Fair Value	6,000	6,000
Equity Securities without Readily Determinable Fair Value, Amount	24,228	19,225
Equity Securities, FV-NI and without Readily Determinable Fair Value	30,514	25,216
FHLB and Federal Reserve Bank stocks	331,420	295,496
Residential loans held for sale	35,742	20,383
Commercial loans held for sale	33,490	0
Loans, net	28,880,640	28,486,849
Bank owned life insurance, fair value	677,328	676,530
Servicing Asset at Fair Value, Amount	74,479	77,351	$ 57,158
Financial liabilities
Short-term funding	226,608	605,937
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances	4,986,138	4,319,861
Other long-term funding	544,103	248,071
Standby letters of credit(c)
Financial liabilities
Standby letters of credit, fair value	3,000	3,000
Lending Related Commitments By Type [Domain]	251,565	270,692
US Treasury Securities
Financial assets
Available-for-sale Securities	111,743	109,378
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	999	999
Investment securities held to maturity, fair value	947	936
Fair Value, Inputs, Level 1
Financial assets
Available-for-sale Securities	111,743	109,378
Equity securities with readily determinable fair value, Carrying Amount	6,286	5,991
Equity securities with readily determinable fair values, Fair Value	6,286	5,991
Fair Value, Inputs, Level 1 | US Treasury Securities | Fair Value, Measurements, Recurring
Financial assets
Available-for-sale Securities	111,743	109,378
Fair Value, Inputs, Level 2
Financial assets
Available-for-sale Securities	3,269,864	2,632,647
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	3,966,060	3,959,399
Investment securities held to maturity, fair value	3,480,530	3,400,028
Equity Securities without Readily Determinable Fair Value, Amount	5,000	0
Equity Securities, FV-NI and without Readily Determinable Fair Value	5,000	0
Financial liabilities
Brokered CDs and other time deposits	2,937,916	1,930,158
Brokered CDs and other time deposits, fair value	2,937,916	1,930,158
Short-term funding	226,608	605,937
Short-term funding, fair value	226,600	605,205
Advances, Fair Value Disclosure	4,987,658	4,322,264
Long-term funding, fair value	535,836	242,151
Standby letters of credit	2,717	2,881
Standby letters of credit, fair value	2,717	2,881
Fair Value, Inputs, Level 2 | Other Assets [Member]
Financial assets
Derivative Asset	94,349	68,672
Derivatives (trading and other assets), fair value	94,349	68,672
Fair Value, Inputs, Level 2 | Other Liabilities [Member]
Financial liabilities
Derivatives (trading liabilities)	202,533	254,459
Derivatives (trading and other liabilities), fair value	202,533	254,459
Fair Value, Inputs, Level 3
Financial assets
Equity Securities without Readily Determinable Fair Value, Amount	19,228	19,225
Equity Securities, FV-NI and without Readily Determinable Fair Value	19,228	19,225
Loans, net, fair value	27,921,022	27,481,426
Servicing Asset	74,479	77,351
Servicing Asset at Fair Value, Amount	74,479	77,351
Financial liabilities
Noninterest-bearing demand, savings, interest-bearing demand, and money market accounts	27,393,908	27,705,996
Noninterest-bearing demand, savings, interest-bearing demand, and money market deposits, fair value	27,393,908	27,705,996
Derivatives (trading liabilities)	441	46
Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring
Financial assets
Servicing Asset at Fair Value, Amount	74,479	77,351
Fair Value, Inputs, Level 3 | Mortgage banking(a) | Fair Value, Measurements, Recurring
Financial assets
Derivative Asset	$ 338	$ 86