Fair Value Measurements, Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Financial assets
Cash and due from banks	$ 386,231	$ 343,831
Interest-bearing deposits in other financial institutions	112,173	681,684
Federal funds sold and securities purchased under agreements to resell	4,015	0
Available-for-sale Securities	2,487,312	4,332,015
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	3,951,553	2,239,003
Investment securities held to maturity, fair value	3,295,760	2,348,664
Equity securities with readily determinable fair values, Fair Value	6,000	5,000
Equity Securities without Readily Determinable Fair Value, Amount	19,000	14,000
Equity Securities, FV-NI and without Readily Determinable Fair Value	24,879	18,352
FHLB and Federal Reserve Bank stocks	279,334	168,281
Residential loans held for sale	51,134	136,638
Loans, net	27,524,376	23,944,934
Bank owned life insurance, fair value	677,129	680,021
Servicing Asset at Fair Value, Amount	78,352	57,158
Financial liabilities
Short-term funding	284,361	354,262
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances	3,777,478	1,621,047
Other long-term funding	249,484	249,324
Letters of Credit Outstanding, Amount	240,000	231,000
US Treasury Securities
Financial assets
Available-for-sale Securities	108,284	122,957
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	998	1,000
Investment securities held to maturity, fair value	932	1,001
Fair Value, Inputs, Level 1
Financial assets
Available-for-sale Securities	108,284	122,957
Equity securities with readily determinable fair value, Carrying Amount	5,655	4,810
Equity securities with readily determinable fair values, Fair Value	5,655	4,810
Fair Value, Inputs, Level 1 | US Treasury Securities | Fair Value, Measurements, Recurring
Financial assets
Available-for-sale Securities	108,284	122,957
Fair Value, Inputs, Level 2
Financial assets
Available-for-sale Securities	2,379,028	4,209,058
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	3,950,493	2,237,947
Investment securities held to maturity, fair value	3,294,767	2,347,608
Financial liabilities
Brokered CDs and other time deposits	1,233,833	1,347,262
Brokered CDs and other time deposits, fair value	1,233,833	1,347,262
Short-term funding	284,361	354,262
Short-term funding, fair value	283,755	354,248
Advances, Fair Value Disclosure	3,780,744	1,680,814
Long-term funding, fair value	243,586	265,545
Standby letters of credit	2,457	2,367
Standby letters of credit, fair value	2,457	2,367
Fair Value, Inputs, Level 2 | Other Assets [Member]
Financial assets
Derivative Asset	69,726	90,379
Derivatives (trading and other assets), fair value	69,726	90,379
Fair Value, Inputs, Level 2 | Other Liabilities [Member]
Financial liabilities
Derivatives (trading liabilities)	274,642	32,921
Derivatives (trading and other liabilities), fair value	274,642	32,921
Fair Value, Inputs, Level 3
Financial assets
Equity Securities without Readily Determinable Fair Value, Amount	19,224	13,542
Equity Securities, FV-NI and without Readily Determinable Fair Value	19,224	13,542
Loans, net, fair value	26,285,810	23,980,330
Servicing Asset	78,352	54,862
Servicing Asset at Fair Value, Amount	78,352	57,259
Derivative Asset	3,000	30
Financial liabilities
Noninterest-bearing demand, savings, interest-bearing demand, and money market accounts	27,964,749	27,119,167
Noninterest-bearing demand, savings, interest-bearing demand, and money market deposits, fair value	27,964,749	27,119,167
Derivatives (trading liabilities)	403	0
Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring
Financial assets
Derivative Asset	3,492	30
Fair Value, Inputs, Level 3 | Mortgage banking(a)(b)
Financial assets
Derivative Asset	0	2,617
Fair Value, Inputs, Level 3 | Mortgage banking(a)(b) | Fair Value, Measurements, Recurring
Financial assets
Derivative Asset	0	2,617
Financial liabilities
Derivatives (trading liabilities)	403	0
Fair Value, Inputs, Level 3 | Forward commitments (mortgage)
Financial assets
Derivative Asset	$ 3,492	$ 30