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Fair Value Measurement - Estimates Fair Value of Financial Instruments (Detail) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Financial Assets |  |
Cash and due from banks | $ 759,048 | $ 905,447
Equity securities | 13,123 | 13,047
Available-for-sale debt securities | 2,775,212 | 1,978,136
Held-to-maturity debt securities | 813,740 | 731,212
Loans held for sale | 153,520 | 168,378
Accrued interest receivable | 68,896 | 66,790
Financial Liabilities |  |
Deposits | 13,286,999 | 12,429,373
Federal Home Loan Bank borrowings | 433,984 | 549,003
Other borrowings | 137,218 | 241,950
Subordinated debt and junior subordinated debt | 192,430 | 192,291
Accrued interest payable | 3,224 | 4,314
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Financial Assets |  |
Cash and due from banks | 759,048 | 905,447
Equity securities | 13,123 | 13,047
Accrued interest receivable | 68,896 | 66,790
Financial Liabilities |  |
Deposits | 11,731,925 | 10,810,863
Other borrowings | 125,925 | 235,796
Accrued interest payable | 3,224 | 4,314
Significant Other Observable Inputs (Level 2) [Member] |  |
Financial Assets |  |
Available-for-sale debt securities | 2,773,701 | 1,976,601
Held-to-maturity debt securities | 839,411 | 767,720
Loans held for sale | 153,520 | 168,378
Other assets - interest rate derivatives | 31,732 | 46,418
Financial Liabilities |  |
Deposits | 1,568,803 | 1,629,118
Federal Home Loan Bank borrowings | 438,211 | 555,375
Subordinated debt and junior subordinated debt | 105,371 | 105,768
Other liabilities - interest rate derivatives | 32,470 | 49,917
Significant Unobservable Inputs (Level 3) [Member] |  |
Financial Assets |  |
Available-for-sale debt securities | 1,511 | 1,535
Held-to-maturity debt securities | 461 | 463
Net loans | 10,540,445 | 10,802,883
Financial Liabilities |  |
Subordinated debt and junior subordinated debt | 66,771 | 68,684
Carrying Amount [Member] |  |
Financial Assets |  |
Cash and due from banks | 759,048 | 905,447
Equity securities | 13,123 | 13,047
Available-for-sale debt securities | 2,775,212 | 1,978,136
Held-to-maturity debt securities | 813,450 | 730,886
Net loans | 10,543,272 | 10,603,406
Loans held for sale | 153,520 | 168,378
Other assets - interest rate derivatives | 31,732 | 46,418
Accrued interest receivable | 68,896 | 66,790
Financial Liabilities |  |
Deposits | 13,286,999 | 12,429,373
Federal Home Loan Bank borrowings | 433,984 | 549,003
Other borrowings | 137,218 | 241,950
Subordinated debt and junior subordinated debt | 192,430 | 192,291
Other liabilities - interest rate derivatives | 32,470 | 49,917
Accrued interest payable | 3,224 | 4,314
Fair Value Estimate [Member] |  |
Financial Assets |  |
Cash and due from banks | 759,048 | 905,447
Equity securities | 13,123 | 13,047
Available-for-sale debt securities | 2,775,212 | 1,978,136
Held-to-maturity debt securities | 839,872 | 768,183
Net loans | 10,540,445 | 10,802,883
Loans held for sale | 153,520 | 168,378
Other assets - interest rate derivatives | 31,732 | 46,418
Accrued interest receivable | 68,896 | 66,790
Financial Liabilities |  |
Deposits | 13,300,728 | 12,439,981
Federal Home Loan Bank borrowings | 438,211 | 555,375
Other borrowings | 125,925 | 235,796
Subordinated debt and junior subordinated debt | 172,142 | 174,452
Other liabilities - interest rate derivatives | 32,470 | 49,917
Accrued interest payable | $ 3,224 | $ 4,314

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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 Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(6)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121558606&loc=SL82898722-210454 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121553693&loc=d3e26610-111562 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 + Details
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- Definition Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=99377092&loc=SL75136599-209740 + Details
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- Definition Amount of interest payable on debt, including, but not limited to, trade payables. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.15(5)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.15(a)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 + Details
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- Definition Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121593590&loc=d3e4428-111522 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 210.9-03.7) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
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