Fair Value Measurements, Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Financial assets
Cash and due from banks	$ 397,364	$ 343,831
Interest-bearing deposits in other financial institutions	436,887	681,684
Federal Funds Sold and Securities Borrowed or Purchased under Agreements to Resell, Fair Value Disclosure	32,820	0
Available-for-sale Securities	2,677,511	4,332,015
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	3,945,269	2,239,003
Investment securities held to maturity, fair value	3,534,192	2,348,664
Equity securities with readily determinable fair values, Fair Value	6,000	5,000
Equity Securities without Readily Determinable Fair Value, Amount	14,000	14,000
Equity Securities, FV-NI and without Readily Determinable Fair Value	19,039	18,352
FHLB and Federal Reserve Bank stocks	237,616	168,281
Residential loans held for sale	42,676	136,638
Commercial loans held for sale	44,721	0
Loans, net	26,213,927	23,944,934
Bank owned life insurance, fair value	675,347	680,021
Servicing Asset at Fair Value, Amount	76,570	57,158
Financial liabilities
Short-term funding	705,620	354,262
FHLB advances	3,258,039	1,621,047
Other long-term funding	249,820	249,324
Letters of Credit Outstanding, Amount	274,000	248,000
US Treasury Securities
Financial assets
Available-for-sale Securities	113,109	122,957
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	998	1,000
Investment securities held to maturity, fair value	955	1,001
Fair Value, Inputs, Level 1
Financial assets
Available-for-sale Securities	113,109	122,957
Equity securities with readily determinable fair value, Carrying Amount	5,502	4,810
Equity securities with readily determinable fair values, Fair Value	5,502	4,810
Fair Value, Inputs, Level 1 | US Treasury Securities | Fair Value, Measurements, Recurring
Financial assets
Available-for-sale Securities	113,109	122,957
Fair Value, Inputs, Level 2
Financial assets
Available-for-sale Securities	2,564,402	4,209,058
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	3,944,208	2,237,947
Investment securities held to maturity, fair value	3,533,175	2,347,608
Financial liabilities
Brokered CDs and other time deposits	1,223,581	1,347,262
Brokered CDs and other time deposits, fair value	1,223,581	1,347,262
Short-term funding	705,620	354,262
Short-term funding, fair value	705,216	354,248
Advances, Fair Value Disclosure	3,250,216	1,680,814
Long-term funding, fair value	250,571	265,545
Standby letters of credit	2,617	2,367
Standby letters of credit, fair value	2,617	2,367
Fair Value, Inputs, Level 2 | Other Assets [Member]
Financial assets
Derivative Asset	38,374	90,379
Derivatives (trading and other assets), fair value	38,374	90,379
Fair Value, Inputs, Level 2 | Other Liabilities [Member]
Financial liabilities
Derivatives (trading liabilities)	177,720	32,921
Derivatives (trading and other liabilities), fair value	177,720	32,921
Fair Value, Inputs, Level 3
Financial assets
Equity Securities without Readily Determinable Fair Value, Amount	13,538	13,542
Equity Securities, FV-NI and without Readily Determinable Fair Value	13,538	13,542
Loans, net, fair value	25,322,573	23,980,330
Servicing Asset	76,570	54,862
Servicing Asset at Fair Value, Amount	76,570	57,259
Derivative Asset		30
Financial liabilities
Noninterest-bearing demand, savings, interest-bearing demand, and money market accounts	27,352,996	27,119,167
Noninterest-bearing demand, savings, interest-bearing demand, and money market deposits, fair value	27,352,996	27,119,167
Derivatives (trading liabilities)	113	0
Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring
Financial assets
Derivative Asset	0	30
Fair Value, Inputs, Level 3 | Interest Rate Lock Commitments [Member]
Financial assets
Derivative Asset	986	2,617
Fair Value, Inputs, Level 3 | Interest Rate Lock Commitments [Member] | Fair Value, Measurements, Recurring
Financial assets
Derivative Asset	986	2,617
Fair Value, Inputs, Level 3 | Forward commitments (mortgage)
Financial assets
Derivative Asset	0	30
Fair Value, Inputs, Level 3 | TBA securities
Financial assets
Derivative Asset	$ 47	$ 0