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Loans and Allowance for Credit Losses on Loans - Allowance For Credit-Loan Losses (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 31, 2024 | Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023
Allowance for credit losses |  |  |  |
Balance, beginning of period | $ 71,752,000 | $ 71,752,000 | $ 44,014,000 | $ 44,014,000
Provision for loan losses |  | 4,900,000 | 7,800,000 |
FMBI's ACL for loans sold | (593,000) | (593,000) |  |
Provision for credit losses |  | 5,477,000 | 7,817,000 | 37,488,000
Loans charged to the allowance |  | (925,000) |  | (9,791,000)
Recoveries of loans previously charged-off |  | 1,000 | 7,000 | 41,000
Balance, end of period |  | 75,712,000 | 51,838,000 | 71,752,000
ACL Loans |  |  |  |
Provision for credit losses |  | 4,726,000 | 6,867,000 |
Provision for credit losses, ACL Loans |  | 4,900,000 | 7,800,000 |
Provision for credit losses, ACL-OBCE's |  | (200,000) | (900,000) |
Elimination of FMBI's ACL for loans sold | 593,000 | 593,000 |  |
Mortgage warehouse lines of credit |  |  |  |
Allowance for credit losses |  |  |  |
Balance, beginning of period | 2,070,000 | 2,070,000 | 1,249,000 | 1,249,000
Provision for credit losses |  | 952,000 | 415,000 | 821,000
Balance, end of period |  | 3,022,000 | 1,664,000 | 2,070,000
Residential real estate |  |  |  |
Allowance for credit losses |  |  |  |
Balance, beginning of period | 7,323,000 | 7,323,000 | 7,029,000 | 7,029,000
FMBI's ACL for loans sold |  | (55,000) |  |
Provision for credit losses |  | (363,000) | 349,000 | 328,000
Loans charged to the allowance |  |  |  | (34,000)
Balance, end of period |  | 6,905,000 | 7,378,000 | 7,323,000
ACL Loans |  |  |  |
Elimination of FMBI's ACL for loans sold |  | 55,000 |  |
Multi-family financing |  |  |  |
Allowance for credit losses |  |  |  |
Balance, beginning of period | 26,874,000 | 26,874,000 | 16,781,000 | 16,781,000
FMBI's ACL for loans sold |  | (186,000) |  |
Provision for credit losses |  | 1,976,000 | 3,070,000 | 18,493,000
Loans charged to the allowance |  |  |  | (8,400,000)
Balance, end of period |  | 28,664,000 | 19,851,000 | 26,874,000
ACL Loans |  |  |  |
Elimination of FMBI's ACL for loans sold |  | 186,000 |  |
Healthcare financing |  |  |  |
Allowance for credit losses |  |  |  |
Balance, beginning of period | 22,454,000 | 22,454,000 | 9,882,000 | 9,882,000
FMBI's ACL for loans sold |  | (2,000) |  |
Provision for credit losses |  | 2,135,000 | 1,871,000 | 12,572,000
Balance, end of period |  | 24,587,000 | 11,753,000 | 22,454,000
ACL Loans |  |  |  |
Elimination of FMBI's ACL for loans sold |  | 2,000 |  |
Commercial and commercial real estate |  |  |  |
Allowance for credit losses |  |  |  |
Balance, beginning of period | 12,243,000 | 12,243,000 | 8,326,000 | 8,326,000
FMBI's ACL for loans sold |  | (92,000) |  |
Provision for credit losses |  | 763,000 | 2,149,000 | 5,232,000
Loans charged to the allowance |  | (925,000) |  | (1,356,000)
Recoveries of loans previously charged-off |  | 1,000 | 7,000 | 41,000
Balance, end of period |  | 11,990,000 | 10,482,000 | 12,243,000
ACL Loans |  |  |  |
Elimination of FMBI's ACL for loans sold |  | 92,000 |  |
Agricultural production and real estate |  |  |  |
Allowance for credit losses |  |  |  |
Balance, beginning of period | 619,000 | 619,000 | 565,000 | 565,000
FMBI's ACL for loans sold |  | (246,000) |  |
Provision for credit losses |  | 77,000 | (22,000) | 54,000
Balance, end of period |  | 450,000 | 543,000 | 619,000
ACL Loans |  |  |  |
Elimination of FMBI's ACL for loans sold |  | 246,000 |  |
Consumer and margin loans |  |  |  |
Allowance for credit losses |  |  |  |
Balance, beginning of period | $ 169,000 | 169,000 | 182,000 | 182,000
FMBI's ACL for loans sold |  | (12,000) |  |
Provision for credit losses |  | (63,000) | (15,000) | (12,000)
Loans charged to the allowance |  |  |  | (1,000)
Balance, end of period |  | 94,000 | $ 167,000 | $ 169,000
ACL Loans |  |  |  |
Elimination of FMBI's ACL for loans sold |  | $ 12,000 |  |

X
- Definition Amount excluding accrued interest, of allowance for credit loss on financing receivable. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479344/326-20-45-1 + Details
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