XML 72 R29.htm IDEA: XBRL DOCUMENT
v3.25.2

Deposits (Tables) | 6 Months Ended
--- | ---
Jun. 30, 2025
Deposits [Abstract] |
Summary of Average Balances and Weighted Average Rates Paid on Deposits | The following table presents average balances and weighted average rates paid on deposits for the periods indicated (dollars in thousands):
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2025 |  | 2024 |  | 2025 |  | 2024
| Average Balance |  | Average Rate Paid(1) |  | Average Balance |  | Average Rate Paid(1) |  | Average Balance |  | Average Rate Paid(1) |  | Average Balance |  | Average Rate Paid(1)
Demand deposits: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-interest bearing | $ | 7,993,915 |  |  | — | % |  | $ | 7,448,633 |  |  | — | % |  | $ | 7,705,120 |  |  | — | % |  | $ | 7,004,780 |  |  | — | %
Interest bearing | 5,407,538 |  |  | 3.39 | % |  | 3,742,071 |  |  | 3.79 | % |  | 5,111,328 |  |  | 3.37 | % |  | 3,663,217 |  |  | 3.77 | %
Savings and money market | 10,355,700 |  |  | 3.41 | % |  | 11,176,000 |  |  | 4.28 | % |  | 10,593,396 |  |  | 3.42 | % |  | 11,205,130 |  |  | 4.26 | %
Time | 3,919,526 |  |  | 3.79 | % |  | 4,750,640 |  |  | 4.56 | % |  | 4,122,014 |  |  | 3.89 | % |  | 4,990,909 |  |  | 4.50 | %
| $ | 27,676,679 |  |  | 2.47 | % |  | $ | 27,117,344 |  |  | 3.09 | % |  | $ | 27,531,858 |  |  | 2.52 | % |  | $ | 26,864,036 |  |  | 3.13 | %
(1)Annualized.
Time Deposit Maturities | The following table presents maturities of time deposits as of June 30, 2025 (in thousands):
Maturing in: |
2025 | $ | 3,049,768 |
2026 | 725,618 |
2027 | 1,308 |
2028 | 346 |
2029 | 257 |
Thereafter | 937 |
| $ | 3,778,234 |
Included in deposits are public funds deposits of $3.0 billion and $3.1 billion, at June 30, 2025 and December 31, 2024, respectively, and brokered deposits of $4.1 billion and $5.2 billion at June 30, 2025 and December 31, 2024, respectively.
schedule of interest expense on deposits | Interest expense on deposits for the periods indicated was as follows (in thousands):
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2025 |  | 2024 |  | 2025 |  | 2024
Interest bearing demand | $ | 45,689 |  |  | $ | 35,249 |  |  | $ | 85,582 |  |  | $ | 68,756 |
Savings and money market | 88,023 |  |  | 118,945 |  |  | 179,802 |  |  | 237,584 |
Time | 36,983 |  |  | 53,897 |  |  | 79,521 |  |  | 111,749 |
| $ | 170,695 |  |  | $ | 208,091 |  |  | $ | 344,905 |  |  | $ | 418,089 |

X
- Definition schedule of interest expense on deposits + References No definition available. + Details
Name: | bku_ScheduleOfInterestExpenseOnDepositsTableTextBlock
Namespace Prefix: | bku_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the summary of average balances and weighted average rates paid on deposits. + References No definition available. + Details
Name: | bku_SummaryOfAverageBalancesAndWeightedAverageRatesPaidOnDepositsTableTextBlock
Namespace Prefix: | bku_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_DepositsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of time deposit liability maturities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 1 -SubTopic 10 -Topic 470 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481544/470-10-50-1 + Details
Name: | us-gaap_TimeDepositMaturitiesTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration