Fair Value Measurements, Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Financial assets
Cash and due from banks	$ 436,952	$ 343,831
Interest-bearing deposits in other financial institutions	156,693	681,684
Federal funds sold and securities purchased under agreements to resell	27,810	0
Debt Securities, Available-for-sale	2,742,025	4,332,015
Investment securities held to maturity	3,960,451	2,239,003
Investment securities held to maturity, fair value	3,401,018	2,348,664
Equity Securities with Readily Determined Fair Value	6,000	5,000
Equity Securities without Readily Determinable Fair Value, Amount	19,000	14,000
Equity securities	25,216	18,352
FHLB and Federal Reserve Bank stocks	295,496	168,281
Loans and Leases Receivable, Net Amount	28,486,849	23,944,934
Life Insurance, Corporate or Bank Owned, Amount	676,530	680,021
Mortgage servicing rights, net(a)	77,351	57,158
Financial liabilities
Short-term funding	605,937	354,262
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances	4,319,861	1,621,047
Other long-term funding	1,442,932
Commitment on standby letters of credit	271,000	231,000
US Treasury Securities [Member]
Financial assets
Debt Securities, Available-for-sale	109,378	122,957
Investment securities held to maturity	999	1,000
Investment securities held to maturity, fair value	936	1,001
Fair Value, Inputs, Level 1
Financial assets
Cash and due from banks	436,952	343,831
Interest-bearing deposits in other financial institutions	156,693	681,684
Federal funds sold and securities purchased under agreements to resell	27,810	0
Debt Securities, Available-for-sale	109,378	122,957
Equity securities with readily determinable fair value, Carrying Amount	5,991	4,810
Equity Securities with Readily Determined Fair Value	5,991	4,810
Fair Value, Inputs, Level 1 | US Treasury Securities [Member]
Financial assets
Investment securities held to maturity	999	1,000
Investment securities held to maturity, fair value	936	1,001
Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring [Member] | US Treasury Securities [Member]
Financial assets
Debt Securities, Available-for-sale	109,378	122,957
Fair Value, Inputs, Level 2
Financial assets
Debt Securities, Available-for-sale	2,632,647	4,209,058
Investment securities held to maturity	3,959,399	2,237,947
Investment securities held to maturity, fair value	3,400,028	2,347,608
FHLB and Federal Reserve Bank stocks	295,496	168,281
Loans Held-for-sale, Fair Value Disclosure	20,383	136,638
Life Insurance, Corporate or Bank Owned, Amount	676,530	680,021
Financial liabilities
Brokered CDs and other time deposits	1,930,158	1,347,262
Brokered CDs and other time deposits, fair value	1,930,158	1,347,262
Short-term funding	605,937	354,262
Short-term funding, fair value	605,205	354,248
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances	4,319,861	1,621,047
Advances, Fair Value Disclosure	4,322,264	1,680,814
Other long-term funding	248,071	249,324
Long-term funding, fair value	242,151	265,545
Standby letters of credit	2,881	2,367
Standby letters of credit, fair value	2,881	2,367
Fair Value, Inputs, Level 2 | Other Assets [Member]
Financial assets
Derivative Assets	68,672	90,379
Derivatives (trading and other assets), fair value	68,672	90,379
Fair Value, Inputs, Level 2 | Liability
Financial liabilities
Derivative Liability	254,459	32,921
Derivatives (trading and other liabilities), fair value	254,459	32,921
Fair Value, Inputs, Level 3
Financial assets
Equity Securities without Readily Determinable Fair Value, Amount	19,225	13,542
Equity securities	19,225	13,542
Loans and Leases Receivable, Net Amount	28,486,849	23,944,934
Loans Receivable, Fair Value Disclosure	27,481,426	23,980,330
Servicing Asset	77,351	54,862
Mortgage servicing rights, net(a)	77,351	57,259
Derivative Assets		30
Financial liabilities
Noninterest-bearing demand, savings, interest-bearing demand, and money market accounts	27,705,996	27,119,167
Noninterest-bearing demand, savings, interest-bearing demand, and money market accounts, fair value	27,705,996	27,119,167
Fair Value, Inputs, Level 3 | Forward commitments (mortgage)
Financial assets
Derivative Assets	0	30
Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring [Member] | Mortgage banking(a)(b)
Financial assets
Derivative Assets	86	2,617
Financial liabilities
Derivative Liability	46	0
Derivatives (trading and other liabilities), fair value	46	0
Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring [Member] | Forward commitments (mortgage)
Financial liabilities
Derivative Liability	$ 46	$ 0