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Fair Value Measurement of Assets and Liabilities (Tables)
 3 Months Ended
Mar. 31, 2021
Fair Value Disclosures [Abstract]  
Assets and Liabilities Measured at Fair Value on a Recurring and Non-Recurring Basis The following tables present the assets and liabilities that are measured at fair value on a recurring and non-recurring basis by level within the fair value hierarchy as reported on the consolidated statements of financial condition at March 31, 2021 and December 31, 2020. The assets presented under “non-recurring fair value measurements” in the tables below are not measured at fair value on an ongoing basis but are subject to fair value adjustments under certain circumstances (e.g., when an impairment loss is recognized). 
 March 31,
2021		Fair Value Measurements at Reporting Date Using:
 Quoted Prices
in Active Markets
for Identical
Assets (Level 1)		Significant
Other
Observable Inputs
(Level 2)		Significant
Unobservable
Inputs
(Level 3)
 (in thousands)
Recurring fair value measurements:
Assets
Investment securities:
Equity securities (1)
$29,724 $19,742 $— $— 
Available for sale:
U.S. Treasury securities51,199 51,199 — — 
U.S. government agency securities24,010 — 24,010 — 
Obligations of states and political subdivisions
72,722 — 72,593 129 
Residential mortgage-backed securities
878,336 — 878,336 — 
Corporate and other debt securities89,954 — 89,954 — 
Total available for sale debt securities1,116,221 51,199 1,064,893 129 
Loans held for sale (2)
232,068 — 232,068 — 
Other assets (3)
155,633 — 155,633 — 
Total assets$1,533,646 $70,941 $1,452,594 $129 
Liabilities
Other liabilities (3)
$22,503 $— $22,503 $— 
Total liabilities$22,503 $— $22,503 $— 
Non-recurring fair value measurements:
Collateral dependent loans $38,883 $— $— $38,883 
Loan servicing rights682 — — 682 
Foreclosed assets 1,683 — — 1,683 
Total$41,248 $— $— $41,248 
  Fair Value Measurements at Reporting Date Using:
 December 31,
2020		Quoted Prices
in Active Markets
for Identical
Assets (Level 1)		Significant
Other
Observable Inputs
(Level 2)		Significant
Unobservable
Inputs
(Level 3)
 (in thousands)
Recurring fair value measurements:
Assets
Investment securities:
Equity securities (1)
$26,379 $18,600 $— $— 
Available for sale:
U.S. Treasury securities51,393 51,393 — — 
U.S. government agency securities26,157 — 26,157 — 
Obligations of states and political subdivisions79,950 — 79,135 815 
Residential mortgage-backed securities1,090,022 — 1,090,022 — 
Corporate and other debt securities91,951 — 91,951 — 
Total available for sale1,339,473 51,393 1,287,265 815 
Loans held for sale (2)
301,427 — 301,427 — 
Other assets (3)
387,452 — 387,452 — 
Total assets$2,054,731 $69,993 $1,976,144 $815 
Liabilities
Other liabilities (3)
$156,281 $— $156,281 $— 
Total liabilities$156,281 $— $156,281 $— 
Non-recurring fair value measurements:
Collateral dependent impaired loans $35,228 $— $— $35,228 
Loan servicing rights15,603 — — 15,603 
Foreclosed assets 7,387 — — 7,387 
Total$58,218 $— $— $58,218 
(1)Includes equity securities measured at net asset value (NAV) per share (or its equivalent) as a practical expedient totaling $10.0 million and $7.8 million at March 31, 2021 and December 31, 2020, respectively. These securities have not been classified in the fair value hierarchy.
(2)Represents residential mortgage loans held for sale that are carried at fair value and had contractual unpaid principal balances totaling approximately $226.6 million and $286.4 million at March 31, 2021 and December 31, 2020, respectively.
(3)Derivative financial instruments are included in this category.
Carrying Amounts and Estimated Fair Values of Financial Instruments
The carrying amounts and estimated fair values of financial instruments not measured and not reported at fair value on the consolidated statements of financial condition at March 31, 2021 and December 31, 2020 were as follows: 
 Fair Value
Hierarchy		March 31, 2021December 31, 2020
 Carrying
Amount		Fair ValueCarrying
Amount		Fair Value
 (in thousands)
Financial assets
Cash and due from banksLevel 1$280,915 $280,915 $257,845 $257,845 
Interest bearing deposits with banksLevel 11,352,918 1,352,918 1,071,360 1,071,360 
Equity securities (1)
Level 33,249 3,249 2,999 2,999 
Held to maturity debt securities:
U.S. Treasury securitiesLevel 168,031 74,179 68,126 75,484 
U.S. government agency securities
Level 25,659 5,795 6,222 6,513 
Obligations of states and political subdivisions
Level 2454,021 465,674 470,259 484,506 
Residential mortgage-backed securities
Level 21,787,211 1,797,741 1,550,306 1,589,655 
Trust preferred securitiesLevel 237,354 30,728 37,348 30,033 
Corporate and other debt securitiesLevel 238,750 39,244 40,750 41,421 
Total held to maturity debt securities (2)
2,391,026 2,413,361 2,173,011 2,227,612 
Net loansLevel 332,343,536 32,113,414 31,876,869 31,635,060 
Accrued interest receivableLevel 1107,790 107,790 106,230 106,230 
Federal Reserve Bank and Federal Home Loan Bank stock (3)
Level 2247,158 247,158 250,116 250,116 
Financial liabilities
Deposits without stated maturitiesLevel 127,134,131 27,134,131 25,220,924 25,220,924 
Deposits with stated maturitiesLevel 25,451,078 5,448,891 6,714,678 6,639,022 
Short-term borrowingsLevel 11,084,666 1,060,430 1,147,958 1,151,478 
Long-term borrowingsLevel 22,242,931 2,242,747 2,295,665 2,405,345 
Junior subordinated debentures issued to capital trusts
Level 256,152 45,863 56,065 57,779 
Accrued interest payable (4)
Level 119,972 19,972 18,839 18,839 
(1)Represents equity securities without a readily determinable fair value measured at cost less impairment, if any.
(2)The carrying amount is presented gross without the allowance for credit losses.
(3)Included in other assets.
(4)Included in accrued expenses and other liabilities.