Fair Value Measurements, Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Financial assets
Cash and due from banks	$ 373,380	$ 507,187
Interest-bearing deposits in other financial institutions	207,624	221,226
Federal funds sold and securities purchased under agreements to resell	7,740	148,285
Investment securities held to maturity	2,205,083	2,740,511
Investment securities held to maturity, fair value	2,276,465	2,710,271
Investment securities available for sale	3,262,586	3,946,941
Equity Securities with Readily Determined Fair Value	2,000	2,000
Equity Securities without Readily Determinable Fair Value, Amount	13,000	0
Equity securities	15,090	1,568
FHLB and Federal Reserve Bank stocks	227,347	250,534
Commercial loans held for sale	15,000	14,943
Loans, net	22,620,068	22,702,406
Bank and Corporate Owned Life Insurance	671,948	663,203
Financial liabilities
Short-term funding	465,113	157,074
Other long-term funding	3,210,310
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances	3,180,967	3,574,371
Commitment on standby letters of credit	278,000	256,000
Fair Value, Inputs, Level 1
Financial assets
Cash and due from banks	373,380	507,187
Cash and due from banks, Fair Value	373,380	507,187
Interest-bearing deposits in other financial institutions	207,624	221,226
Interest-bearing deposits in other financial institutions, fair value	207,624	221,226
Federal funds sold and securities purchased under agreements to resell	7,740	148,285
Federal funds sold and securities purchased under agreements to resell, fair value	7,740	148,285
Investment securities held to maturity	999	0
Investment securities held to maturity, fair value	1,018	0
Investment securities available for sale	0	999
Investment securities available for sale, at fair value	0	999
Equity securities with readily determinable fair value, Carrying Amount	1,646	1,568
Equity Securities with Readily Determined Fair Value	1,646	1,568
Fair Value, Inputs, Level 2
Financial assets
Investment securities held to maturity	2,204,084	2,740,511
Investment securities held to maturity, fair value	2,275,447	2,710,271
Investment securities available for sale	3,262,586	3,945,943
Investment securities available for sale, at fair value	3,262,586	3,945,943
FHLB and Federal Reserve Bank stocks	227,347	250,534
FHLB and Federal Reserve Bank stocks, fair value	227,347	250,534
Residential Loans Receivable Held for sale Net Not Part of Disposal Group	136,280	64,321
Mortgages Held-for-sale, Fair Value Disclosure	136,280	64,321
Commercial loans held for sale	15,000	14,943
Commercial Loans Held-for-sale, Fair Value Disclosure	15,000	14,943
Bank and Corporate Owned Life Insurance	671,948	663,203
Bank owned life insurance, fair value	671,948	663,203
Financial liabilities
Brokered CDs and other time deposits	2,622,803	2,815,401
Brokered CDs and other time deposits, fair value	2,622,803	2,815,401
Short-term funding	465,113	157,074
Short-term funding, fair value	465,113	157,074
Other long-term funding	549,343	795,611
Long-term funding, fair value	588,774	826,612
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances	3,180,967	3,574,371
Advances, Fair Value Disclosure	3,207,793	3,565,572
Standby letters of credit	2,710	2,482
Standby letters of credit, fair value	2,710	2,482
Fair Value, Inputs, Level 2 \| Asset
Financial assets
Derivative Assets	101,778	89,052
Derivatives (trading and other assets), fair value	101,778	89,052
Fair Value, Inputs, Level 2 \| Liability
Financial liabilities
Net Amounts Presented on the Consolidated Balance Sheets	36,745	87,817
Derivatives (trading and other liabilities), fair value	36,745	87,817
Fair Value, Inputs, Level 3
Financial assets
Equity Securities without Readily Determinable Fair Value, Amount	13,444	0
Equity securities	13,444	0
Loans, net	22,620,068	22,702,406
Loans, net, fair value	22,399,621	22,317,395
Derivative Assets	2,527	2,208
Derivatives (trading and other assets), fair value	2,527	2,208
Financial liabilities
Noninterest-bearing demand, savings, interest-bearing demand, and money market accounts	21,156,261	22,081,992
Noninterest-bearing demand, savings, interest-bearing demand, and money market accounts, fair value	21,156,261	22,081,992
Net Amounts Presented on the Consolidated Balance Sheets	710	2,072
Derivatives (trading and other liabilities), fair value	$ 710	$ 2,072

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale.

No definition available.