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Fair Value - Carrying Amounts and Estimated Fair Values of Financial Instruments, Not Carried at Fair Value (Detail) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020 | Mar. 31, 2020
--- | --- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Cash, due from banks, money market, and other interest-earning investments | $ 457,777 | $ 589,712 |
Loans, net | 13,811,224 | 13,655,091 |
Accrued interest receivable | 80,841 | 85,306 |
Noninterest-bearing demand deposits | 6,091,054 | 5,633,672 |
Time deposits | 1,042,903 | 1,122,870 |
Federal funds purchased and interbank borrowings | 922 | 1,166 |
Securities sold under agreements to repurchase | 395,242 | 431,166 | $ 318,067
Federal Home Loan Bank advances | 1,912,541 | 1,991,435 |
Other borrowings | 266,282 | 252,787 |
Carrying Value |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Cash, due from banks, money market, and other interest-earning investments | 457,777 | 589,712 |
Accrued interest receivable | 80,841 | 85,306 |
Noninterest-bearing demand deposits | 6,091,054 | 5,633,672 |
Checking, NOW, savings, and money market interest-bearing deposits | 10,715,798 | 10,280,911 |
Time deposits | 1,042,903 | 1,122,870 |
Federal funds purchased and interbank borrowings | 922 | 1,166 |
Securities sold under agreements to repurchase | 395,242 | 431,166 |
Federal Home Loan Bank advances | 1,912,541 | 1,991,435 |
Other borrowings | 266,282 | 252,787 |
Accrued interest payable | 3,257 | 5,443 |
Standby letters of credit | 455 | 462 |
Commitments to extend credit | 0 | 0 |
Carrying Value | Commercial |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans, net | 4,042,345 | 3,922,642 |
Carrying Value | Commercial real estate |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans, net | 6,002,458 | 5,867,795 |
Carrying Value | Residential real estate |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans, net | 2,193,012 | 2,235,814 |
Carrying Value | Consumer credit |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans, net | 1,573,409 | 1,628,840 |
Estimate of Fair Value Measurement | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Cash, due from banks, money market, and other interest-earning investments | 457,777 | 589,712 |
Accrued interest receivable | 947 | 21 |
Noninterest-bearing demand deposits | 6,091,054 | 5,633,672 |
Checking, NOW, savings, and money market interest-bearing deposits | 10,640,798 | 10,180,911 |
Time deposits | 0 | 0 |
Federal funds purchased and interbank borrowings | 922 | 1,166 |
Securities sold under agreements to repurchase | 395,242 | 431,166 |
Federal Home Loan Bank advances | 0 | 0 |
Other borrowings | 0 | 0 |
Accrued interest payable | 0 | 0 |
Standby letters of credit | 0 | 0 |
Commitments to extend credit | 0 | 0 |
Estimate of Fair Value Measurement | Quoted Prices in Active Markets for Identical Assets (Level 1) | Commercial |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans, net | 0 | 0 |
Estimate of Fair Value Measurement | Quoted Prices in Active Markets for Identical Assets (Level 1) | Commercial real estate |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans, net | 0 | 0 |
Estimate of Fair Value Measurement | Quoted Prices in Active Markets for Identical Assets (Level 1) | Residential real estate |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans, net | 0 | 0 |
Estimate of Fair Value Measurement | Quoted Prices in Active Markets for Identical Assets (Level 1) | Consumer credit |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans, net | 0 | 0 |
Estimate of Fair Value Measurement | Significant Other Observable Inputs (Level 2) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Cash, due from banks, money market, and other interest-earning investments | 0 | 0 |
Accrued interest receivable | 26,169 | 27,977 |
Noninterest-bearing demand deposits | 0 | 0 |
Checking, NOW, savings, and money market interest-bearing deposits | 74,998 | 99,957 |
Time deposits | 1,057,644 | 1,140,922 |
Federal funds purchased and interbank borrowings | 0 | 0 |
Securities sold under agreements to repurchase | 0 | 0 |
Federal Home Loan Bank advances | 1,974,389 | 2,092,033 |
Other borrowings | 279,515 | 254,612 |
Accrued interest payable | 3,257 | 5,443 |
Standby letters of credit | 0 | 0 |
Commitments to extend credit | 0 | 0 |
Estimate of Fair Value Measurement | Significant Other Observable Inputs (Level 2) | Commercial |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans, net | 0 | 0 |
Estimate of Fair Value Measurement | Significant Other Observable Inputs (Level 2) | Commercial real estate |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans, net | 0 | 0 |
Estimate of Fair Value Measurement | Significant Other Observable Inputs (Level 2) | Residential real estate |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans, net | 0 | 0 |
Estimate of Fair Value Measurement | Significant Other Observable Inputs (Level 2) | Consumer credit |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans, net | 0 | 0 |
Estimate of Fair Value Measurement | Significant Unobservable Inputs (Level 3) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Cash, due from banks, money market, and other interest-earning investments | 0 | 0 |
Accrued interest receivable | 53,725 | 57,308 |
Noninterest-bearing demand deposits | 0 | 0 |
Checking, NOW, savings, and money market interest-bearing deposits | 0 | 0 |
Time deposits | 0 | 0 |
Federal funds purchased and interbank borrowings | 0 | 0 |
Securities sold under agreements to repurchase | 0 | 0 |
Federal Home Loan Bank advances | 0 | 0 |
Other borrowings | 0 | 0 |
Accrued interest payable | 0 | 0 |
Standby letters of credit | 455 | 462 |
Commitments to extend credit | 7,873 | 11,822 |
Estimate of Fair Value Measurement | Significant Unobservable Inputs (Level 3) | Commercial |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans, net | 4,060,059 | 3,912,948 |
Estimate of Fair Value Measurement | Significant Unobservable Inputs (Level 3) | Commercial real estate |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans, net | 5,962,329 | 5,797,447 |
Estimate of Fair Value Measurement | Significant Unobservable Inputs (Level 3) | Residential real estate |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans, net | 2,201,917 | 2,264,274 |
Estimate of Fair Value Measurement | Significant Unobservable Inputs (Level 3) | Consumer credit |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans, net | $ 1,569,425 | $ 1,618,365 |

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- Definition Amount of borrowings as of the balance sheet date from the Federal Home Loan Bank, which are primarily used to cover shortages in the required reserve balance and liquidity shortages. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 + Details
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