Fair Value Measurements, Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022	Dec. 31, 2021
Financial assets
Cash and due from banks	$ 407,620	$ 436,952
Interest-bearing deposits in other financial institutions	190,881	156,693
Federal funds sold and securities purchased under agreements to resell	31,160	27,810
Available-for-sale Securities	3,504,777	2,742,025
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	3,939,001	3,960,451
Investment securities held to maturity, fair value	3,402,092	3,401,018
Equity securities with readily determinable fair values, Fair Value	7,000	6,000
Equity Securities without Readily Determinable Fair Value, Amount	24,231	19,225
Equity Securities, FV-NI and without Readily Determinable Fair Value	30,883	25,216
FHLB and Federal Reserve Bank stocks	271,637	295,496
Residential loans held for sale	38,083	20,383
Commercial loans held for sale	15,000	0
Bank owned life insurance, fair value		676,530
Mortgage servicing rights, net	80,449	77,351	$ 57,158
Financial liabilities
Short-term funding	341,253	605,937
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances	3,630,747	4,319,861
Standby letters of credit(c)
Financial liabilities
Standby letters of credit, fair value	3,000	3,000
Lending Related Commitments By Type [Domain]	252,513	270,692
Fair Value, Inputs, Level 1
Financial assets
Available-for-sale Securities	109,954	109,378
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	999	999
Investment securities held to maturity, fair value	940	936
Equity securities with readily determinable fair value, Carrying Amount	6,652	5,991
Equity securities with readily determinable fair values, Fair Value	6,652	5,991
Fair Value, Inputs, Level 2
Financial assets
Available-for-sale Securities	3,394,824	2,632,647
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	3,937,878	3,959,399
Investment securities held to maturity, fair value	3,401,027	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
Bank owned life insurance, fair value	678,578	676,530
Financial liabilities
Brokered CDs and other time deposits	6,111,439	1,930,158
Brokered CDs and other time deposits, fair value	6,111,439	1,930,158
Short-term funding	341,253	605,937
Short-term funding, fair value	341,159	605,205
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances	3,630,747	4,319,861
Advances, Fair Value Disclosure	3,616,943	4,322,264
Other long-term funding	534,273	248,071
Long-term funding, fair value	516,464	242,151
Standby letters of credit	2,719	2,881
Standby letters of credit, fair value	2,719	2,881
Fair Value, Inputs, Level 2 | Other Assets [Member]
Financial assets
Derivative Asset	120,193	68,672
Derivatives (trading and other assets), fair value	120,193	68,672
Fair Value, Inputs, Level 2 | Other Liabilities [Member]
Financial liabilities
Derivatives (trading liabilities)	258,226	254,459
Derivatives (trading and other liabilities), fair value	258,226	254,459
Fair Value, Inputs, Level 3
Financial assets
Equity Securities without Readily Determinable Fair Value, Amount	19,231	19,225
Equity Securities, FV-NI and without Readily Determinable Fair Value	19,231	19,225
Loans, net	29,510,153	28,486,849
Loans, net, fair value	28,581,324	27,481,426
Servicing Asset	80,449	77,351
Mortgage servicing rights, net	80,449	77,351
Financial liabilities
Noninterest-bearing demand, savings, interest-bearing demand, and money market accounts	25,902,970	27,705,996
Noninterest-bearing demand, savings, interest-bearing demand, and money market deposits, fair value	25,902,970	27,705,996
Derivatives (trading liabilities)	0	46
Derivatives (trading and other liabilities), fair value	0	46
Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring
Financial assets
Mortgage servicing rights, net	80,449	77,351
Derivative Asset	336	0
Fair Value, Inputs, Level 3 | Mortgage banking(a)(b) | Fair Value, Measurements, Recurring
Financial assets
Derivative Asset	431	86
Fair Value, Inputs, Level 3 | Forward commitments (mortgage)
Financial assets
Derivative Asset	$ 336	$ 0